HP Omni 100-5000 - Desktop PC Betriebsanweisung

WinMLS 2004Reference DocumentationMorset Sound DevelopmentE-mail: [email protected]: +47 73915000, Mobile: +47 99705410Fax: +1 8105396811 (Norwa

16.5.2 Setting the upper x-axis limit...25616.5.3 Setting the

6.5.1 Connect a loop-back to be used as referenceA loop-back is typically a cable connected from the output to the input of the sound card as shown in

If you select Right channel input, the input signal from channel 2 is used as reference for computing the impulseresponse. The sound card response is

The advantage with this method is that it does not use an input channel as reference signal during the measurement,thus all channels can be used if yo

5. Save this measurement as the measurement system correction measurement by clicking the button. Then the active measurement will be set as the corre

your PC while performing a measurement. If such an error is detected, the measurement will be canceled, a newmeasurement will start and a warning is g

Select Measurement->Start to start performing the measurement. An error message will be given if the loop-backvolume is too low or too high. Adjust

4. If nothing above helps, try to turn on the check box. This may not work on old PC’swith bad performance.6.8 Measurement 7: How to measure correct

A 2-channel measurement is quite similar to a one-channel measurement. But if you are measuring using the loop-back, special consideration must be tak

2-channel loop-back for sound cards with one input onlyIf your sound card only has one input line, a device has to be used for summing the signals as

Choose a different line Loop-back input than the line you have selected for performing the measurement. If yourLoop-back input channel is mono, make s

18.8.3Sound card mixer gain steps... 28118.9Settings...

6.9.2 Synchronization Loop-back Connection for Mono Full Duplex Sound CardsRead this section only if the sound card is only capable of one-channel sim

Note: In the left part of the Status Bar (positioned at the bottom of the WinMLS program) shown above you will benotified when the measurement starts.

6.11.2.1 Preparation for performing a measurementTo perform a simple 1-channel measurement, connect a microphone to the left input of the sound card a

Two plots are displayed, the lower displays the measured impulse response plotted on a logarithmic y-axis thatdisplays the level in dB. From this plot

To open the dialog box shown above, go to Plot->Plot Type Settings->Room Acoustics... (or the F5 key or click the button on the Plot Toolbar).Yo

Reverberation time (T30, 1/3-octave)Frequency [Hz]100 1 000 10 000T30 [s]3,43,232,82,62,42,221,81,61,41,210,80,60,40,2Curve...\RoomAcoustics\omni.w av

6.11.3.4 Displaying values in octave bands, octave bands, low-mid-high or broadbandSo far the result has been displayed in one-third octave bands, but

6.11.3.6 Calculating StatisticsComputing average and other statistics, such as STD, maximum and minimum, can be done in a spreadsheet byexporting the

Select the radio button to plot statistics.Then mark the curves you want to include for computing the mean value. In the example above, all three cu

Open the dialog box containing the auto-statistics settings from Plot->Overlay Settings... Make sure the settings areset as shown below.Click the

19.8.7Limit curve...33019.8.8Ref

Click the button if you want to copy the data to the clipboard and paste it to a spreadsheet (for example MSExcel). You can also select an area in

A better result is usually given if the impulse response is measured using a stationary signal played from a loudspeakerinstead of a short pulse. To o

6.11.3.10.2 Alternative 1: Measure using a single sine sweepSingle sweep is set as default as shown under option 3. in the dialog box below because i

In a situation with high background noise and no time variance you can select as shown in thefigure below instead of single sweep. A multiple sweep

6.12 Post-processing 1: Room acoustical parametersThis example on how to post-process room acoustical parameters in WinMLS was done as a part of a rou

Click the button to copy the results to clipboard as shown below:C:\WinMLSmeasurements\AnalysisTestSig.wavF(Hz) 63 125 250 5001000 2000 4000 80

Here make sure the User Defined Reverberation Time is set to a decay range of –5 to –20 to get EDT15. Note that ithas to be checked as shown above. I

6.12.3 ClarityTaks: Please specify C50 and/or C80.We found both C50 and C80 in the section above. The values are in the range 125- 4000 Hz are:-8.5 -9

In the figure above, the yellow vertical line gives the detection of the time window. By default WinMLS finds the startof the impulse response automat

Then click on the button shown in the figure above to display the dialog boxshown belowSet the start of impulse response to manual as shown in the f

19.16.14Shift magnitude...36319.17Plot Type

F(Hz) 63 125 250 500 1000 2000 4000 8000 16000snr(dB) 30.1 50.3 53.7 54.3 54.0 55.3 52.6 43.0 24.5edr(dB) 44.6 57.9 60.3 66.2 69.1 68.8 69.3 61.6

Here make sure the User Defined Reverberation Time is set to a decay range of –5 to –20 to get EDT15. Note that ithas to be check marked. In addition,

We have also selected speech parameters, by clicking the button we select that we do not want to considerthe background noise and select the speech

The data are displayed in a table in the following sectionG:\BigBackup\WinMLSmeasurements\NPLsurreyWorkshop\SmallRoom\SineSweepHighLevelCut.wav133

6.13.1.4.1 Results6.13.1.4.1.1 SMALL ROOMAll data are measured in the same position using a custom made microphone. We use the data from the sweep mea

F(Hz) 63 125 250 500 1000 2000 4000 8000 16000snr(dB)11.6 27.7 29.6 22.6 26.5 25.5 25.0 23.8 12.3edr(dB)28.6 43.1 44.1 37.2 41.9 41.0 42.9 40.9 2

F(Hz) 63 125 250 500 1000 2000 4000 8000 16000snr(dB)10.9 28.3 34.5 31.7 30.1 30.2 26.4 24.4 12.0edr(dB)26.2 53.4 48.4 45.2 45.0 45.5 44.4 41.4 2

6.13.1.4.1.2 Large room6.13.1.4.1.2.1 Upper postion: Use the MLS measurement, the 63 Hz octave is not valid. (There was an error with sweep measuremen

r(m)11.417 Program Setups7.1 SetupsThe current WinMLS settings can be saved for usage later from Setup->Store... A setup can be loaded from Setup-

2. Make sure the check box is checked. This is important since if an errorwith the setup occurs it is important that new sound card settings are loa

20.4.1snr - Signal to noise and edr - effective decay ranges... 39720.4.2corr - Correlation...

Click to exit the dialog box.Now exit WinMLS and restart it again. When WinMLS is restarted, it should load the setup you selected above.7.1.4 WinML

7.1.5 WinMLS File Structure DiagramWinMLS stores its settings in several files found under different sub-directories of the WinMLS folder as shownbelo

Post Processing Set-up .wmp (SetupsPostProcessing dir) Limit Curves .txt and .ref (Limitcurves dir) Plot Layout .tee (Chart dir) Microphone Compens

8.1.4 My frequency response measurements look too flat, why?This may be because somehow the output signal may be directly connected to the input (this

8.2 Issues8.2.1 Double-clicking in the plot will not open the plot type settings dialogThis feature had to be disabled because it has been reported to

8.2.8 Special case: If two plots are displayed showing the same plot type.If two plots are displayed showing the same plot type (e.g. frequency respon

9 FAQ: General9.1 How to get started analyzing measurements files (e.g. wav files)?Go to Setup->Load…. In this dialog select a setup as shown in th

9.3 How to transfer the license from one computer to another computerThis is described in the help file. To find the section, first open the help file

If the sound card input and output is calibrated, an impulse/frequency response measurement should give anamplification of 0 dB for a loop-back measur

If you are not already in the Output Level Calibration dialog box, go to Measurement->Calibration…, click the button to the right of the Use output

22.6.1Transfer License... 42823Airborne S

The sampling frequency has been set to 44100 Hz. In the figure below, we see that the length of the sweep is 20seconds and there is 3.8 seconds of sil

10.5.1.3 Before measuringWhen you are measuring using external signal you must use exactly the same measurement settings as when the signalwas generat

10.5.1.4 Start the measurementBefore starting the measurement, you also need to change the no. of meas. cycles from 16 to 1 as shown in the figurebelo

10.5.2.2 How?You can either use WinMLS to playback the output signal and record using a DAT/MD/CDR player, or you can do itopposite.You can also use t

Now connect the DAT player input to the left sound card output and start the measurement (Measurement->Start).Then start recording on your DAT/MD/C

In the lower of the two figures above, we see the impulse response plotted on a dB vertical axis. When doing this wesee that the impulse response has

10.6.2 Step-by-step guide to create a wizard10.6.2.1 Prepare a wizard documentFirst you have to organize the task you are going to “wizardize” into st

In this dialog, make sure is checked.10.6.2.4.1 Add a new wizard stepclick the button to add a new wizard step as shown below.As seen above, the t

Write the title and text as indicated in the upper part of the figure above.If you want to write numbered list like shown below you need to end the li

If is checked, it is impossible for the user to access any settings in WinMLS, exceptthe wizard dialog itself. If it is unchecked, the user can use

1 IntroductionWinMLS is software for performing and evaluating audio, acoustical and vibrational measurements. The name WinMLS consists of the first p

It is recommended that you answer “Yes”. Note: If you are writing a new wizard, remember to save the setup under anew name so the previous setup is no

10.10What format is recommended for saving measurement data?In most of the default setups, the .wmb (WinMLS binary files) is the default file format a

It is not recommended to use this emphasis for sine sweep excitation signal.10.13.1How to band limit the excitation signal?If you are using a sine swe

10.14How to check the background noise spectrum of an impulse response measurement?If you have measured an impulse response, the noise spectrum can be

From the upper plot (frequency response) we see that there is a noise floor with clear components at 1 kHz, 2 kHz, 3kHz, 4 kHz and 5 kHz.10.15What is

10.17How to delete a measurement?If you have performed a measurement and want to delete it, go to Measurement->Clear Memory->ActiveMeasurement….

Alternatively, you can generate multiple shortcuts where each shortcut specifies the setup that WinMLS will load onstartup (see below). Renamed short

10.24Can multi-channel measurements (>2 input channels) be performed using WinMLS?WinMLS is capable of measuring up to 24 channels simultaneously,

11 FAQ: Plotting and Post Processing11.1 Plotting – general informationSome general plot-settings are found on the standard toolbar to the right of th

Note: the button displays the settings for all the frequency domain plot types.If a setting in this dialog box is changed, it will thus affect all t

Curves, Plots and Measurement Raw Data A measurement can either be opened from file or performed using the sound card to sample the data . The mea

Alternatively, you may type in the time of flight delay in milliseconds in the same dialog box.You may also make sure the time window is set so the in

11.1.11If waterfall is plotted, how to read the value of a specific waterfall slice?This feature is only supported if the waterfall layout mode is set

Another method is to turn off and change the Rotation and Elevation values. Selecting another layout mode can also solve this problem. Go to Plot-&g

Note: When using this mode you may have to adjust the plot depth as described in the above section: How to set thedepth of the waterfall plot?.11.1.15

The other method gives very efficient plotting for large amounts of data, e.g. for large *.wav-files. From Plot->Layout->Advanced … check one of

In the Series list, you can choose if all curves or just one curve are to be exported.11.1.21How to save the plot as a picture?The active plot is save

11.1.23How to make calculations, such as subtraction?Note that the method that will be described only works if the data has exactly the same vertical

Double-click on the type of mathematical function you want, e.g. Add (see above). After double-clicking, you will goto the series properties shown bel

11.1.24How to plot the level of a measurement in octave or one-third-octave bands?The energy of an impulse response or the power of a stationary signa

Note if or is checked, the centerfrequencies will not be the standard IEC frequencies.Click the button to exit the dialog boxes. Finally the plo

In order to use WinMLS efficiently it is important to understand the user interface. WinMLS can have one or twoplots displayed (in the figure above th

Magnitude Frequency ResponseFrequency [Hz]1 000 10 000[dB]-4-6-8-10-12-14-16Please note that the smoothing can be applied to all the frequency domain

Click the OK button to exit the dialog boxes. An example of 1/3 octave normalized energy is displayed in the figure below. Normalized energy in 1/3-oc

If we use the scroll bar to scroll further down we see that 5000 Hz corresponds to number 13610 as shown in thefigure below..Now go to Plot->Layout

To change the curve type without changing the default curve type, in Plot->Layout->Edit..., click to open thedialog. For more explanation see

Now you can change the colors. In the example above, the gradient starts with white and ends with blue. The results isas shown below.If you do not wis

Frequ enc y [Hz ]60059058057056055 054 053 052 051 050049048047 046 045 044 043 042 041 040039038037 036 035 034 0[dB]0-2-4-6-8-10-12-14-16-18-20-22-

When Solo is on, only the curve belonging to the active measurement is visible. The other curves will be invisible inthe plot, but they are not delete

11.2.11When printing a plot, why is the plot squeezed to the left corner?A typical plot is shown below.The plot is squeezed to the left because the le

11.2.13How to change the names displayed in the legend?The default names of measurements that are performed (and not opened from file) can be changed

You can also display the legend above or below the plot. In the figure below the legend is plotted below the plot.Setting the legend position is done

1.2.4 Remove the toolbarsYou can select which toolbars to be displayed from the Toolbars menu. For example all toolbars can be removed inproduction co

11.2.16How to access zoom options, e.g. to turn the mouse zooming on/off ?From Plot->Layout->Edit..., select the General tag, then select the Zo

Note: If the mouse zooming is deactivated, see the section above to activate it.11.2.18Personal versions only: How to move the curves away from the na

Minor gridlines are available from the Minor tag, found at the right side of the Ticks tag.11.2.21The y-axis labels show only zeros, how to change thi

The Values Format: list box has a list of used formats. You may also type your own format. To the left in the dialogbox you see a list of the axes. Se

To display the numerical value of these lines can also be done in the legend as shown belowTo do this, go to Plot-> Layout->Edit... and click th

11.2.25How to find the maximum frequency and its value?You can find the maximum frequency (e.g. the feedback frequency) from the Frequency Response –

How to do this is explained in a section below. You can easily change the font of the text. In cases where you have tobe far away from your PC and don

One of the text boxes you add to the plot, will be used to display the cursor value as shown in the figure below.Therefore, if you only add one text b

The font can be changed from the Text tab by clicking the button shown below.Select the tabs shown above to set other layout options.11.2.29How to a

11.2.32How to print graphs at very high qualityIn File->Print Preview… you can decide how detailed you want the graphs to be printed. The setting b

Contents1Introduction...

Andrew Goldberg (Genelec Finland)SwedenLennart Ødlund (sound engineer and acoustics consultant, PA Ljud AB)Tobias Kirchner (acoustics consultant, Inge

Click the Panel tag, then click the button to remove the nag screen.To remove the footer text shown above push the F6 key again if you need to open

12FAQ: Room AcousticsRefer to the help in the dialog boxes for additional information.12.1 How to measure room acoustics?When using WinMLS for measuri

12.4 How can the Room Acoustics Parameters Grid be copied to a spreadsheet (e.g.,Excel)?This can be done first by computing the parameters to a table

find the reverberation time by measuring 30 dB decay and extrapolate the rest of the line down to 60 dB. This is whatis recommended in the ISO 3382 st

1. Close any open dialogs.2. From Setup->Load..., if you have not done so already, load the setup named Room Acoustics_Strength (G). 3. Go to Plot-

12. Perform the measurements of each position and save them (you can use File->Save As... to save if you are notasked to save after each measuremen

In this dialog box select ISO 3382 Strength as shown above and then click the button to open the dialog shown below.Follow the steps in the dialog box

Then the early reflections can be found as peaks in the plot as shown below.Meas_11Meas_8Distance [meter]10510095908580757065605550454035302520151050-

12.9.2 Why is it not possible to drag the map to 0 millisecondsNote that it may not be possible to move the map to 0 milliseconds. The reason is that

12.10.1Limitations when plotting parameters needing two measurementsAn example of a plot needing two impulse responses is shown below.If displaying ed

Such a microphone must usually be connected to the microphone input of the sound card, since it will provide thephantom power supply voltage needed.Fo

There is still a problem if several curves are plotted and Plot->Refresh… is selected with the setting asshown below.Each curve will not remember

To mark several measurements, hold the <Ctrl> key while clicking on the measurements that are to be inserted.<Shift> can also be Note: The

If you are batch-processing many files, you should also make sure that the measurements are deleted from memoryafter the parameters are computed. This

Reverberation Time (Tu)Frequency [Hz]63 125 250 500 1000 2000 4000 8000 16000T20(s)0,40,20It is, however, possible to change the axis labels and gridl

Now select the Scales tag as shown below:Now we need to change the Log Base from 2 to 10 as shown below.12.17How is the criterion in the automatic det

If you want to measure the absolute values, you need to calibrate the input. Click the button on the StandardToolbar to open the calibration dialog

In step 2 we must select how the calibration should be done. There are two methods, Individual (advanced) andCombined (easy). These methods will be ex

dB = 20*log10(Lin / (10-6))wheredB – logarithmic valueLin – linear valueIf you are measuring displacement then no reference is used, type in the level

13.5 How to measure the frequency response of the measurement system including themicrophone and loudspeaker?The problem with the loudspeaker is that

If the sampling frequency is 48000 kHz, this means 48000 samples.The frequency resolution can also be set as post-processing in WinMLS using the time

www.winmls.comStart the installation.Follow the installation procedure using default settings.After the installation, start WinMLS (by clicking the Wi

13.8 How to plot harmonic distortion for a sinusoidal signal?Go to Setup->Load… and load the setup named General_Harmonic Distortion (1 kHz sine) a

The Power Spectrum plot displays the harmonic distortion components. By moving the mouse cursor above theharmonic you wish to find the value of, the v

13.9 How to measure loudspeaker frequency response and use SPL as vertical axis?To do this the input has to be calibrated. Click the button on the s

In the upper list box select Signal Generator Only. Make sure the frequency is near 1000 Hz as shown in the figurebelow.You should click the Levels ta

13.11How to measure the anechoic response of a loudspeaker without doing themeasurement in an anechoic chamber?You can time-window the impulse respons

Meas_1Meas_2Meas_3Meas_4Meas_5Meas_6Meas_7Meas_8Meas_9Meas_10Meas_11Meas_12Meas_13Meas_14Meas_15Meas_16Meas_17Meas_18Meas_19Energy Spectrum 1/3-Oct. I

You may have to go to Plot->Refresh… and select the setting below to refresh the curves with this setting.Now go to Plot->Layout->Edit… and s

13.13.2How to find the level of a measured impulse response (for example in dBA)?The input chain must be calibrated. Then to be able to get the correc

Click the button to exit the dialog box.Now go to Plot->Plot Type Settings->Active Plot... to display the dialog shown below.First select the

STI or RASTI can be measured using WinMLS. The software has been tested against MLSSA’s STI/RASTIcalculation, the B&K Speech Transmission M

IMPORTANT! Follow the procedure given in the dialog shown above. You need to obtain an unlock code from us torun the software. If you have previously

Speech Transmission Index (STI)Measurement987654321STI10.90.80.70.60.50.40.30.4650.950.9210.946 0.9470.940.9530.9420.493Curve...\Studios\HTS4x2.w mbCu

13.15.3The background noise is “normal” but is varying a lotThe easiest method is simply to do many measurements and average the result. To do the ave

To set this, go to Calculate->Speech->Settings... and select 'Background noise and speech levels given in table below'as shown below.

When the dialog box is exited with you should now see the level difference between the measurements asfunction of frequency.If you want to display t

We tried to go as low as 50 Hz in the Range [Hz] parameter, but were not successful. We did these measurements withsampling frequency 44100 Hz just to

14.1 NewOpens a new instance of WinMLS. If you instead want to open a new window to plot a new curve, do this fromWindow->New Window...14.2 Open..

The file types are described below14.2.1.1 Supported Files (*.wmb, *.wmt, *.wav, *.tim, *.txt. *.sdf)Lists each measurement file type is described bel

14.2.3 Measurement Tasks…Clicking this button opens the Measurement Tasks dialog. From this dialog you can determine what tasks are to bedone when a m

14.4.2 Browser for saving 2-channel MeasurementIf you have performed a 2-channel measurement, the 2-channel browser is displayed. Note that a 2-channe

The usage should be quite intuitive. A multi-channel tag is added to the filename indicating what channel it is.Optionally a counter can be added whic

Perform level measurement of your sub to find the sub placement that gives the highest level. Some generalrecommendations are also given.3.1.1.1.5 Gen

If the measurement is a multi-channel measurement, each channel will be corrected.14.6.2 With Filename ‘_ActiveMeas_’Saves the active measurement and

If is checked, each curve will have each own vertical axis. If WinMLS isdisplaying multiple plots and if is checked, the data from all plots will

14.11Print All...If you have more than one plot displayed, use this to print all displayed plots. The print should look similar to whatyou see on the

Change the detail level value shown above if you want to modify the detail level of the plot.14.13White BackgroundIf this is checked, all plots are gi

The dialog box above shows an example on how to convert three files of the format .wmb to .wav. The .wav-files areput in the Target path.Note: The dat

15.2 Copy DataCopies the data in the active plot to the clipboard so that it may easily be pasted to other software, such as MS Excel.The format is th

15.5 Advanced Export...The advanced method for exporting is shown below, where the Data tab is selected.Below we have selected the Picture tab.From th

Note: The toolbars can be moved around on the screen. Their positions and on/off status are saved in the setup file. 16.1 Levels (and Mixer)Displays a

becomes red if there has been digital clipping during the measurement (e.g. the input level is too high for the soundcard to handle). If this is the c

If WinMLS is set to control the windows mixer, and the gain steps are not set to be defined, a warning message isgiven if you try to change the volume

24/32 bits record/playback x x x x xCalibrate using known microphone sensitivity orsound level meterx x x x x x xCalibrate using Calibrator x x x

16.2.3 Update both plots with the same measurement if is toggled and if the active window contains two plots as shown below, the combo box to the l

The shortcut key for opening the settings is <Ctrl> + <Shift> + S.Note: The measurement raw time domain data is saved. Therefore, if the

To set the curve styles and colors of the measurement panel curves, click the toolbar. This will open the Plot->Layout->Curve Styles and Colors…

16.4.2 Dragging curves to change the curve orderIf a curve in the toolbar is marked (CurveMeas. 2 in the example above), the curve may be dragged up o

16.5 Plot ToolbarThis toolbar should be very useful. It contains settings for • scaling in horizontal and vertical direction• selecting one or two plo

The controls are used for moving the lower limit either up or down.16.5.4 Setting the upper y-axis limitThe controls shown above are used to set th

16.5.8 Settings for the Active PlotClicking on this button will display a dialog box containing the settings for the active plot. This button can be

Invert curve. Same as in Plot->Plot Type Settings->General FrequencyDomain…Smooth curve. Same as found in the plot type settings. Click the

16.7.1 Lower window limitThe controls shown above are used to set the lower window limit. The button will use an algorithm to detect the start of t

16.7.6 Display time window in time data plot typeIf this is toggled, the selected time window will be displayed when plotting with the Time Data plot

Statistics (Mean value of curves) x x x x x xStatistics (Average, min/max, STD) on curves x x xKeyboard shortcuts for fast loading of setups x x x xPo

File->Open…File->Save As…Measurement->Information…File->PrintFile->Print Preview…Edit->Copy PlotMeasurement->StartMeasurement->

To compute the distance in meters, the speed of sound is used. The speed of sound is set in Plot->Plot Type Settings->Time Data...16.10.1Status

Normal.Rotate.Move.Zoom.Depth.Click this to remove the toolbar.Plot->Layout->Edit...Field for displaying rotation, offset and zooming.17Setup m

When WinMLS is exited, the setup filename is saved in registry and all the current settings are saved to a temporarysetup. The next time WinMLS is sta

Clicking the button will display the additional settings shown below.17.2.1 Setup nameThe name of the setup. Type a new name if you do not wish to o

17.2.3 When loading this setup includeYou can select if you want to load the below settings when the setup is loaded.17.2.3.1 Measurements• If is ch

17.2.4 Store post-processing setupIf is checked, the post-processing setup is also stored when storing the measurementsetup.If is not checked, the

Now go to Setup->Import... and select the zip-file containing the setup you want to import.Then go to Setup->Load..., select this setup and clic

17.5 Shortcuts...Use this dialog box if you want to assign shortcuts to a setup.You can use the keys F9-F12, also in combination with the ALT key.Sele

17.7 Options...Open this dialog to modify the settings shown below.17.7.1 Load settings when WinMLS is startedA setup contains all the WinMLS settings

Oct., Low-Mid-High, Broadband (bandwidth) x x x xSpeech ParametersRASTI (assume low bakground noise) x x x x x xSTI (assume low bakground noise, STIPa

17.7.1.2 Load the previous settingsSome users want WinMLS to start with the same settings that then had when they last closed WinMLS. Then makesure

17.8 Full Menu/All ToolbarsIf this menu item is checked, the full menu is displayed and all toolbars are available. If this menu item is not checked,o

18.4 Information…Displays what is the active measurement and shows information about this measurement as shown in the figure below.All measurements pr

18.6 Clear Memory->All MeasurementsClears all the measurements that are present in memory, except the measurements that are plotted. Even measureme

18.8.1.1 Combined calibrationWhen clicking the button, you should see the dialog shown below. If you in step 2. choose to perform acombined calibrat

In step 4, enter the calibrator SPL-level.In step 5, click the button. This will perform the calibration and check that the level is sufficient and

and want to adjust the gain steps of this amplifier, or if you are using WinMLS to perform both electricalmeasurements and measurements using a microp

If your amplifier has adjustable gain in steps and you want to switch between gain steps without redoing thecalibration, read the part below. If not,

18.8.1.2.5 Transducer calibrationThis assumes that was selected in step 2. If not, this dialog may look differently.In step 5 you can calibrate to f

18.8.2 Output level calibrationThe purpose of the absolute output level calibration is to be able to measure impulse responses/transfer function gainw

Click on and enter the serial number of the unregistered copy of the software on thetarget PC. You have to install WinMLS on the target PC to obtain

The advantage of using is that WinMLS will automatically compensate by theappropriate number of decibels when you change the volumes of the mixer. T

18.9 Settings...The measurement settings dialog box contains all the settings for performing a measurement (obtaining the timedomain raw data, e.g. im

Click the button to display the more advanced settings shown below.Each of the settings in this dialog will be explained below.18.9.1.1 Signal typeS

To fine-tune the frequency, use the arrow keys on your keyboard (works only if the slider has focus) or use the control shown in the figure above. The

Click the button to display the more advanced settings shown below.18.9.2.1 Generator onIf the generator is turned on , the dialog typically looks

If is checked, WinMLS will wait until the input level exceeds the trigger level (in this example –30 dBFs, which is 30 dB below digital clipping). W

18.9.2.3.4 SavingSelect save mode from the list shown belowFor details see Impulse/Frequency response section below.Click to open the Measurement-&

Generally you do not need to be very accurate when setting this parameter. Follow the rules in the two subsectionsbelow. This setting will also determ

Delay = Distance \ Speed of soundFor example, if the distance is 34 meter (100 feet), the delay is 0.1 seconds when the speed of sound is 340 m/s (111

In this case you have to select the measurement settings manually by clicking the Sweep or MLS tabs. From thisdialog you can set the sequence/cycle l

You can also open this dialog from Setup->Load... if it is not displayed. The easiest way of using WinMLS is to loada setup that contains the setti

If Right channel is selected, the stimulus is played back through the right channel, which means that the output sourcemust be connected to the output

Our experience is that the best results are obtained if the upper sweep frequency is set to Max as shown in the figureabove. At least you should follo

18.9.3.7 CorrectionIf you in 6. Reference have selected Generator as reference, the sound card delay and frequency response is notautomatica

by the maximum) of the impulse response using linear axis. To plot the amplification in dB, do the same usinglogarithmic x-axis, or plot the magnitude

Select one of the methods shown below for saving18.9.3.8.2.1 Manual saveSave the measurement using File->Save As...18.9.3.8.2.2 Ask before meas.If

18.9.4.1.1 Length• The sweep duration determines the duration of the sweep. • The silence duration is the period of silence after the sweep ends. This

If the check box is checked, resampling is used to reduce thesampling frequency. If the sweep is set to end at a low frequency, the frequencies abov

18.9.4.2.5 Sequence typeTwo different types of sequences for MLS measurements are available, A or B. This feature may be used for distortion/non-linea

18.9.5.2 Change output levelUse this setting if you want WinMLS to automatically change the output level after a measurement s performed. Thisis usefu

Click the button to also display the settings shown below18.10.1Input deviceThe input device name is usually similar to the name of your sound card.

5.4PCI cards... 57

If you wish to play the notification sounds using another sound card instead of turning them off, click the Audio tagshown in the figure above and sel

18.10.3Mixer (volume control)If your sound card supports the Windows mixer (most sound cards do), we recommend that you let WinMLS overrideand control

18.10.3.2 No software mixerIf your sound card does not support the Windows mixer or if you have problems using the mixer, you may setWinMLS not to use

The special settings may influence on the result of your measurements. Therefore, WinMLS will extract these settingsand allow you to set them. These s

Auto,Invert if XP – WinMLS selects the correct mixer line in the Windows mixer. But if the operative system is XP,this selection is inverted.Auto - Wi

The system delay is the same as the time a signal takes to travel through the system we are measuring. If we aremeasuring a loudspeaker, the delay cau

That the sound card is in this list means that the sound card is able to start record and playback at the same time, orwith a delay that is constant.

Time [samples]1501401301201101009080706050403020100uncal. [volts] / uncal. [volts], dB40200-20-40-60-80-100In this case the sound card delay should be

18.12Tasks…Displays the dialog box shown below. From here you can decide what tasks to be executed when a measurement isperformed or opened.18.12.1Whe

18.12.1.2 MemorySelect one of the choices below This determines if the measurements that are not plotted should be kept in memory or c

18.12.1.3.3 Append to text-fileIf is selected, the data in the plot(s) will be appended to the specified file after a measurement isperformed or ope

Open the dialog box shown below from Measurement->Sound Card... The sound card settings will be explained step-by-step in the next sections. Keep

adds a delay after the measurement has been performed. This maybe useful when several measurements are performed in automatic mode.18.13Saving Defaul

18.13.1.1 Add extra tag to filenameIf is checked, you add additional information to the end of the file name. This is currentlyused for sound insula

18.13.2Default title and commentsTitle and comments will be saved to the file header except for the .wmt format, which only saves the comment. Thetitl

18.15Wizard->StartIf a wizard exists in the current WinMLS setup and is set to be used, this command will start the wizard from the firststep.18.16

18.16.1.1 Insert title and textType the title and text as indicated in the upper part of the figure above.18.16.1.2 Select imageSelect the image you w

If is not selected, the setting shown below should be set to ‘1’ unless you plan toperform more than one measurement before showing the next wizard

18.16.3Edit wizard stepClick the button to edit the selected wizard step.18.16.4Move Up wizard stepClick the button to move the selected wizard st

You can erase all curves, or all invisible which is the curves that are not checked in the legend list (to display thelegend list, right click in the

19.3 Add Curve(s)Adds new curves(s) to the active plot (in case more than one plot is displayed). If the active plot is empty or containscurve(s) from

If statistics is selected the user can select different statistical operations as shown below The curve(s) to be added is computed

This allows you to be able to change the analog input and output volumes from within WinMLS.Note that if you are using a LynxStudio card you should no

The setting below is the same as Plot->Overlay. The setting shown below is the same as Plot->Solo Curve.

The styles and colors is set for the Auto-statistics curve (which is the Mean value) and the Upper and Lower spread.The color of the curves is set by

Clicking the button is the same as selecting Plot->Plot Type Settings->Active Plot…from the menu and displays the active plot settings. These

19.6.2 Active curve is meant for use only when auto-refresh is turned off, see next section. The “manual” refreshing lets theuser decide when to refre

This dialog box may seem complex. However, the following explanation should make it easy to understand.19.8.1 Plots in windowWinMLS can display up to

If is selected, the plots are displayed side-by-side as shown below.19.8.3 ResizingThis setting only has an effect when two plots are displayed.If

19.8.4.1 Notify user of test resultIf a test fails, there are several ways of notifying the user.If is checked, the background color in the plot wil

If is checked, the limit curves are not absolute but insteadgenerated based on a reference measurement. To set the a new such reference measurement,

19.8.6 RoutingThe routing selects which channel of the measurement is to be routed to what plot. Select one of the settings below.All channel

Here you can edit the numbers. Remember to save the changes.19.8.8 Reference measurement routingThis setting is used for setting the reference measure

Some of the names may be different than those shown. Usually if you want to use the line input of your soun

19.10Plot Type Settings: Active Plot...Displays the settings for the active plot type. Each of the plot types can also be accessed from the Plot->P

Click the button to open the settings for the Time Data plot type, as shown below.Only the Time Data Processing settings are enabled since the other

19.11.2.3 Select reference measurementThe reference measurement can be selected either from file or from the measurements available in memory.If you w

19.11.3.3 Zeropad to a fixed number of samples is used to determine the exact size of the Fourier transform. Any number may betyped in the box. But

The settings will affect the scaling of the frequency response. If Stationary signal (power) is selected and the plottype is Frequency Response/Spectr

19.12.2Window typeSelects the type of window to be used.The possible choices are shown in the figure below. Note: If an impulse response is to be wind

If you select Fixed size, the time window will always have the same size. This is useful in some applications. If thefixed size specified here should

19.12.6Add to window in Time Data plot typeIf is checked, written information is added to the time window in the Time Data plot type as shown belowI

Note: This only works if the vertical axis is set to dB since the picture has dB as y-axis. For more details see How todetect echoes from a measured i

(Note: The Reference compensation shown above is always disabled, it is not yet implemented).In order to do the compensation, must be checked, then

4.1.4 Number of bitsThe number of bits used for recording (input) and playback (output) is usually set to 16, but can be set to 24 or 32. Ifyour sound

In the example above the microphone is obviously four Neutric 3382. If you have microphones of different brands finda common name for them since the n

Note: If the vertical axis is set to Linear or Squared (energy), the shift will still be given in dB, so a shift of 0 dB willgive the value 1 at 1000

The computation can be done either in time domain or frequency domain dependent on the setting shown belowIf IEC is selected, the octave filtering wil

19.13.7.1 The method for calculating harmonic distortionWhen computing harmonic distortion using this method, the basis is an impulse response measure

19.13.7.2.3 Divide with fundamentalIf is checked, the harmonic distortion is divided by the fundamental. This will calculate therelative harmonic di

The type of smoothing or integration is set from the button and is described below.19.13.8.1 Smoothing settingsThe smoothing settings dialog is used

The advantage with the interpolation is that the curve will look smooth and nice. The disadvantage is that theinterpolation is rather slow. It should

19.13.9.1 Guidelines settingsGuidelines for displaying maximum gain, minimum gain, average gain, and up to four different average gain offsetsare supp

19.13.9.6 Average GainIf checked, a horizontal line is drawn where the average of the active measurement magnitude frequency response isfound within

The phase is influenced by the sound card response. This may be removed by using channel 2 as reference or themeasurement system correction feature. M

4.1.6 Special case: Using the Windows mixer directlyIf your sound card supports the Windows mixer, skip this section since this enables the WinMLS mix

Minimum and excess phase are viewed unwrapped and smoothing (explained below) is performed as the lastcomputation if it

19.14.7Subtract delayIf is checked, the specified delay is removed. If Subtract delay and Remove delay infrequency range (described above) is used

19.15.4Type (3)Selects the type of phase from the list below19.15.4.1 No processing (3)No processing of the group delay is performed.19.15.4.2 Minimum

19.16.1Horizontal axis (4)Selects the unit of the horizontal axis from one of the units displayed in the list shown below.19.16.2Vertical axis (4)Disp

19.16.4.1 Mode (2)Selects what the waterfall should look like.Three choices are possible as shown below.19.16.4.1.1 Separate lines waterfallThe waterf

-0,504-3,174-5,845-8,515-11,185-13,855-16,526-19,196-21,866-24,536-27,207-29,877-32,547-35,218-37,888-40,558-43,228-45,899-48,569-51,239-53,91-56,58-5

In the figure below, the layout is changed. The ortogonal function is turned on. If you prefer this layout, go to Plot->Layout->Edit... and chec

0-2,488-4,976-7,464-9,952-12,44-14,928-17,416-19,904-22,392-24,88-27,368-29,856-32,344-34,832-37,32-39,808-42,296-44,784-47,272-49,76-52,248-54,736-57

1,197-0,76-2,717-4,673-6,63-8,587-10,543-12,5-14,457-16,414-18,37-20,327-22,284-24,241-26,197-28,154-30,111-32,068-34,024-35,981-37,938-39,894-41,851-

19.16.5.2 FFT sizeSelect the length of the data to be used for computing each of the slices using the Fourier transform. The number mustbe specified i

4.1.7 Multi-channel (>2 channel) measurementsTo set WinMLS to measure multi-channel (e.g. 4 channels), go to Measurement->Settings… and select 4

19.16.8FFT shiftSets how many samples the slices are to be shifted before computing the magnitude frequency response on themeasurement data. The numbe

19.16.12Waterfall microphone compensationIf is checked, the microphone compensation specified in the Frequencyresponse/Spectrum settings (Plot->P

The parameters shown in the list above are explained in the documentation for the menu item Calculate->Userdefined: Settings...When plot

Alternatively, the edr can be displayed in the plot as numbers in the plots as shown in the figure below if and are both checked.If is checked, th

Note: If auto-refresh is turned on, this plot type may not be automatically refreshed for all kinds of changes in thesettings which is the case with t

Note also that if Microphone compensation is turned on in Plot->Plot Type Settings->FrequencyResponse/Spectrum... as shown below,then microphone

The polarity check is simply performed by computing the maximum and minimum values of the time data andcomparing these.Note: Under difficult condition

Note that the other settings (DC-component and filtering) will also be included when finding the polarity.If you do not want this to be included when

19.19.1Horizontal axis (5)Selects the unit of the x-axis from one of the units displayed in the list shown below.The chosen unit is also used in the u

Scale by: - scales the measurement with the given factor. If the y-axis is Linear, themeasurement is multiplied with the factor. If the y-axis is Sq

Connect the sound card output ch. 1 (left) to the sound system input. Left and right ch. of the sound system should bemeasured separately.4.2 Sound ca

19.19.6Remove DC-component (0 Hz)If is checked, the DC-component will be removed when plotting. The DC-component is removed by subtracting the DC-co

19.19.8FilteringIf is checked, filtering of the measurement is performed according to the filtering options as shown below.19.19.8.1 Type of filteri

specifies the cut-off frequency of the filter. Any frequency may be typed or selected from thelist of standard 1/3-octave frequencies. Specifies the

The number of curves to be plotted within this frequency range is given by the bandwidth described below. If thebandwidth is set to 1 octave or 1/3 oc

Most of the Energy-time Curve settings and explained in the Plot->Plot Type Settings->Time Data... section. TheEnergy-time Curve the vertical

is taken from the filtering options, accessed by clicking . In the dialog box, the centre frequency andbandwidth are set as shown below.Using the set

This is used to set the axis range. If you need to set the axis range often, we recommend that you use the arrow keysthat are also listed above. Alter

The FAQ section explains how to position and format this text box.19.27Layout: GridlinesDisplays gridlines in the plot active plot.For more detailed g

19.30Layout: FooterDisplay footer in plot. For more detailed footer settings, go to Plot->Layout->Edit..., select the Titles tab. Then select as

How to set your own text will now be explained. Go to Plot->Layout->Edit... and select the Axis tab, then select theTitles tab as shown in the f

Important Point Number 1! The name of the device is VXpocket In #1 and VXpocket Out #1 as shown in step 1and 2 above. Do NOT select the device named

If is checked, the date of the plotted measurement is added.If is checked, the date when the last curve was plotted is added.If is checked, the

In the example below, the initial curve name is ‘Meas’ and it is the first measurement performed after WinMLS is runbecause it is given 1 as number.19

Note that changes to the plotted curve, e.g. changing colors, will not be saved. Default curve styles are set in Plot->Layout->Curve Styles and

By clicking on the cells, the data may be deleted, changed or added. To modify a cell, first click on it to set it active.To delete the cell, click th

The upper part of the dialog shown above sets the default color, width and style for the curves plotted by WinMLS.Curve 1 is the first curve plotted,

Any color may be selected from this dialog.19.35.2Selecting curve width and styleThe curve width and style is set from .The choices are listed below.

Note: If a curve width greater than 1 is used, the plotting speed is decreased. So as a faster alternative to this option isto use Plot->Solo Curve

19.36.1Various (7) (3)These settings apply to all plot types.19.36.1.1 Set cursor to max value on new measurementIf is checked, the cursor (if displ

The user may select a new Curve type and Chart-file for the specific plot type. All the available plot types arepresent in the list. Note: Changing th

19.36.2.3 Chart-fileA Chart-file (*.tee) contains all the settings in the Plot->Chart Settings for Active Plot... dialog (when no curves areplotted

For a gain of +51 dB, a - 41 dBu maximum signal gives 0 dBFS.If you have purchased a package from us that includes a microphone or if you own a microp

In the example above, we see that STI is displayed in red which means that the result is questionable. This is becausethe edr number is slightly less

The various speech transmission indices STI, RASTI, STIrMal, STIrFem, are single number measures based onmodulation reduction and signal-to-noise rati

The MTF is determined by FFT of the filtered and truncated impulse response, and the values at the exact 1/3-octavemodulation frequencies specified ar

20.3.1.4 %ALcons%ALcons is in WinMLS calculated solely from the STI based on an empirical formula.20.3.1.5 EDT and D50Early decay time (EDT) and Deutl

Note: These are total levels, including both direct sound and reverberation. Data must be entered for the octave bands that are included in the STI ca

Note: In this case the computation of other room acoustics parameters (including EDT and D50 in the speechparameter option) must be treated with outmo

The actual signal to noise ratio of an impulse response measurement is estimated from the resulting response itself,and presented as the snr. The esti

To compute the distance in meters, the speed of sound is needed. The formula for computing the speed of sound isgiven below:Speed of sound = 343.3 + 0

The parameters EDT, T30, T20, edr and corr are defined in the Reverb Times section above.For a more thorough introduction to the room acoustical param

20.5.3 D50(%) - DefinitionThe early to total index, or definition, is%)()(100D0202∫∫∞⋅=dtthdtthet(0)Definition is mostly used for speech signals, and

5.9.3IBM x20 (Crystal Soundfusion)... 795.9.4IBM Thinkpad A22

The Nominal In value determines if the VXpocket input is line or microphone. The Nominal In is set to 4.0 dBu asdefault to operate as line input. If i

For information about the G parameter see the next section.20.8 Strength: Settings...The sound strength, or level, is defined asdB)()(log10G021002∫∫∞∞

First select what type of strength you wish to compute. Select in the list shown belowEach selection will display an explanation as shown in the dialo

)()(10)(10twthrth ⋅≈(0)where r is the estimated source to receiver distance and w(t) is a half-Hamming window starting on the arrival of thedirect sou

Direct specification of Lref is done in dB. This is useful in the case where the source and measurement equipment hasbeen pre-measured in an anechoic

The temperature influences the speed of sound and thereby the distance.20.8.3.4 Select calibration measurementsAfter you have performed your calibrati

20.9 SpaciousnessCalculates spaciousness as lateral parameters or interaural crosscorrelation explained in the sections below.You can measure spatial

20.9.1.1 Detecting the start of the impulse responses for lateral parametersIn a lateral calculation based on omni and figure-of-8 microphones, the st

∫∫=eedtttLdtthdtthth02)()()(LFC(0)where the impulse responses are the same as those for LF. This provides an approximation of a weighting of lateralre

WinMLS calculates three versions of the IACC; total with time limits t1 = 0 and t 2= ∞, early with time limits t1 = 0 andt2= 80 ms, and late with time

20.11.1Decay timesThe first three parameters are decay times as shown belowRT-60 Reverberation time (T30) and Early Decay Time (EDT) are defined in th

Note: Below is a plot of some gain steps. It shows that above 2 kHz, the microphone gain is not flat. The deviationbetween the highest gain and lowest

These parameters are defined in the Calculate->ISO 3382 section.The early limits can be changed to numbers other than recommended in the standard.

The time limits for both the LF and LFC parameters can be changed in the boxes shown in the figure above.20.11.7Level and envelopment (strength)The so

20.12.1.1 Single omni-directionalSingle microphone. This is the most common situation.20.12.1.2 Dual omni-directionalTwo independent microphones. This

In fact, the parameters are the same as can be selected from the Calculate menu. So for information about theparameters, see the Calculate menu docume

To minimize the influence of the filter response on the reverberation time calculation, the impulse responses arefiltered backwards. This greatly impr

20.12.5.2 Limit using Time Window upper limitThe user can also select how much of the impulse response should be included for the calculations.The tim

dB)(log10)(2=∫∞tdhtd ττ(0)This provides a monotonically falling decay. The curve is usually normalized to start at 0 dB. In practice the impul

The decay curve forms the basis for calculation of the various decay time parameters, and it can be plotted using theSchroeder plot-type. The plots be

21Window MenuThis menu contains standard windows settings and a list of the windows. In addition, post-processing setup can beloaded and stored.21.1 N

In other words, the settings are independent in each window, but they may be dependent when using several plots inthe same window.After you have selec

Click and select the settings shown below.For a greater than 2-channel measurements, WinMLS does not control the input or output levels. Therefore y

21.2.1 Select post-processing setupDisplays the selected post-processing setup as shown below.Setups are chosen from a list as shown in the figure bel

21.3.1 Setup name (2)Gives the name of the setup. Type a new name if you do not wish to overwrite the current setup.21.3.2 Setup description (4)The se

21.8 List of WindowsDisplays the name of the windows that exist.22Help MenuThis menu contains Help, About and License information. About contains info

Measurement Panel:Ctrl + Alt + 1 Assign (save) active measurement to Button 1Ctrl + 1 Plot/erase (assign if not already) measurement in Button 1Ctrl +

Shift+Ctrl+A Plot->Plot Type Settings->Airborne SoundInsulation...22.3 Walk-through...Opens the WinMLS help-file at the walk-through section.22.

22.5 About WinMLS...Displays the WinMLS About dialog.If the button is clicked, the default Internet browser is opened and the homepage www.winmls.co

For an explanation on how to register and transfer the license, see the Registering WinMLS section in the help-file(or in the User’s Guide document).2

23.1 Remark about type approvalIf you do not wish to use the sound card for such measurements, you may use a sound level meter that has thecapabilitie

23.2.1 Shortcut key preparation to measure as easy and fast as possibleIf you do not have a need to save the intermediate raw data results, you may fo

23.3 Preparation before measuring23.3.1 Calibrate the inputCalibration is needed to measure the correct sound pressure level (SPL). To do the calibrat

If WinMLS is unstable, this is probably because the input level is set to the minimum. Make sure the levels are setabove the minimum value for all inp

Important! It is strongly recommended that you save the measurements in a subfolder under the directory whereWinMLS is installed or the directory you

In the figure above, it is set to measure 10 measurements (which is the minimum according to ISO 140-4:1997). Youcan change this by typing another num

If you would like to measure using two microphones, one microphone in sending room and one in receiving room forthe level measurements, this is also p

The max. decay time + system delay is here set to 1.5 seconds as shown below.If you estimate (or measure) your room to have a much different maximum r

We do not want this dialog box to be displayed, so make sure found at the bottom ofthe dialog is not checked.23.4.1.4 Saving intermediate raw data r

23.4.1.5 Start a new measurementMove the microphone to the next position and perform a new measurement clicking the button and save themeasurement.

23.4.2 Level in Receiving RoomPlace the loudspeaker in the sending room.Place your microphone(s) in the receiving room.Click in the window named LR –

After doing this, close the dialog box clicking the button found at the bottom. A faster way of doing this is touse the F10 shortcut key as describe

But if you are using the new standard (ISO/WD 18233), Measurement->Settings... should be set as shown below.23.4.4 Reverberation time in Receiving

When you start a measurement, WinMLS will now wait until the input level exceeds –30 dBFs (30 dB below digitalclipping). When the signal exceeds this

4.2.4 General information about the Digigram cards (VXpocket, PCXpocket, PCX9 and VX 222)Issues common to these cards for usage with WinMLS are descri

Now click OK to exit the Saving Defaults dialog box.Perform a new measurement using the same microphone position. Move the microphone and perform twom

Note! The order of the windows and titles may be slightly changed.Before calculating, you must set the volume and area. To enter these data, you need

Here you can type the volume and area and select what parameter you want to plot. The reference reverberation time isusually set to 0.5 s; normally th

The measurements are included if the checkbox shown below is checked in Setup->Store...Click to store the setup. Note that only the saved measur

Now extract the zip-file containing the setup you want to open to the folder C:\data.Then go to Setup->Folder... as shown below, select the folder

23.9.2 Export correction factors in footerTo export only the correction factor data in the footer, click in the AirborneResult window to make it activ

Because of these two weaknesses we have selected to use sweep as default and allow MLS as an option.23.10.2How to increase the accuracy of the measure

In this list, select the plot type named Room Acoustics. WinMLS is set up so that then the parameter Strength will bedisplayed, which gives the level

4.2.4.6 Heating of the card may slightly affects the absolute level calibrationThe VXpocket (and possibly the PCXpocket) card can get quite hot (45deg

The phone cable shown in the figure above can be purchased in most stores that sell electronic equipment.You may also set the sound card settings manu

Important: We only got good results with sampling frequency 48000 Hz. This is usually the default setting, but besure go to Measurement-> Settings.

In the new dialog box, click the button to open the dialog shown below. Now followthis procedure step by step.Note: In step 2 above it may give bett

4.5.1 Making a setup for your sound cardGo to Setup->Load... and see if you can find your sound card in the Sound Cards section. If you could not

6.12Post-processing 1: Room acoustical parameters... 1266.12.1Reverberation time..

Go to Measurement->System Delay... to open the dialog box shown below.In this dialog you can select any of the choices above since we only want to

This confirms that the input channels 1 and 2 are sample-synchronous, which would be expected.The next figure shows output channel 1 connected to inpu

If they are not sample synchronous but the difference is stable (e.g. always one sample), this difference may becorrected as a post-processing. It dep

5.1.1 High-end measurementsFor a high-end stationary system, we recommend the Digigram VX 222 or one of the high quality analog cards ordigital cards

5.3 Sound Cards that have been tested to work with WinMLSSound DevicesPCI (stationary PC)Chan-nelsMix-erMic.InputPrice AD/DA bitFs[kHz]NoiseFrequencyR

VXpocket 440 (Digigram)4 Yes Adj E850 24 48 ++ 5 – 24 kPCXPocket V22 Yes No $1400 20 48 +(+) 5 – 23 kSound Chips/LaptopsYamaha AC-XG2 Yes ? - 16 48 0

you can do 2 channel measurements with feedback loop without having to order a special device for this (If you wantto, we can supply such a device). Y

I was able to get the software to work with my Echo Audio Layla 20, but it took some work. The Layla20 has 8analog and 2 digital input channels, with

5.4.7 Card DeluxeHigh quality card that showed good results in our tests, but note that it does not have a software mixer. Very goodspecifications, it

The time delay is stable when used with WinMLS (according to our tests) and is given below. This means that you donot have to use loop-back to be able

10.7How to auto-name when saving measurements?... 16210.8What does the Windows soun

Resulting frequency response.Zoomed in on the impulse response in the figure below. The period is a little more than 2 milliseconds.How to avoid this

Play Mix B has to be turned on, else I get no sound.5.4.10 Lynx L22Same as LynxTWO, but it is two channels only. A great card, probably the best avail

5.4.16 Soundtrack 128 Ruby DDMARead about this card and place international orders online at http://www.hoontech.com/SNR has been measured to be bette

5.4.22 Sound Blaster PCI 128For one of these cards we tested the output signal was directly connected to the input so we had –20 dB cross-talk.This ma

5.5.3 Sound Blaster AWE 64All the features of WinMLS should work with this sound device. Note that the microphone input is mono.5.5.4 Sound Blaster 16

• To measure accurate system delay, you need to use the WinMLS loop-back feature, else you can get severalmilliseconds error.• It is not powered by th

Important: If you are going to measure impulse or frequency response, you need to connect a loop-back from theright channel output to the right channe

The input has a DC voltage of 1-2 Volts that a standard multimedia microphone is using. To turn on the microphonegain, make sure that one of the +14,

Important: The driver must be installed from the CD that comes with the package.Very important: The CMSS button must be turned off. If the CMSS green

Note: When something is connected to the line input, the mic input does not work.5.6.6 Creative Mp3+This card is described in the sound card settings

11.1.28How to plot spectrum in octave or one-third-octave bands?... 18211.1.29How to validate numbers typed in

96 kHz sampling frequency was a disaster, It was not possible to get a decent measurement above 24 kHz because thefilters seem to be the same as for F

You should also always use Single sweep as shown in point 3. above. This will give the best results. If using multiplesweeps, make sure that is set in

Note: It is not possible to set the input levels using the WinMLS mixer. It must be done from the knobs shown to theleft in the figure above. (Adjust

Because of the synchronization problems with the USB Pre, we do not recommend that you use the MeasurementSystem Correction feature of WinMLS, we inst

This swept sine method has many advantages compared to MLS. Below we se an example of an impulse responsemeasured using the USB Pre and VXpocket. We r

is that the input volume controls knobs do not move in steps and these cannot be locked. The input volume cannot beset using software mixer either, it

5.7 Firewire Devices5.7.1 Motu828It is a single-rack unit device with 8 input and 8 output channels. I only use two of them with WinMLS. The loopbackr

5.8 PCMCIA cards (laptop)5.8.1 VXPocket (V2) by DigigramThe big advantage of this card is that it can be used in most laptops since it is a PCMCIA car

5.9.3 IBM x20 (Crystal Soundfusion)This laptop has a Crystal Soundfusion chip. 5.9.4 IBM Thinkpad A22E (Crystal WMD Audio Codec)This laptop has a Crys

6 The first measurements walk-throughIn this chapter we will explain how to use WinMLS for various types of measurements. If your type of measurement

12.8.1Performing calibration measurements... 20512.8.2Less accurate calibr

6.1.2 Setting analog input and output levelMake sure Toolbars->Levels (and Mixer) is checked or click the button. Now the mixer you have selected

6.1.3 Setting digital output levelSetting the digital output level is useful if you are not able to set the output level using any other method or if

The testing of levels can be stopped with Measurement->Cancel or with the button on the standardtoolbar.Start a measurement from Measurement->

The red curve in the upper plot displays the magnitude frequency response of the sound card. The lower plot displaysthe impulse response. We see that

From this we see that the sound card has a delay of 41 time samples. It is possible to correct for this delay as explainedin the measurement part of t

6.1.8 Verifying the sound card measurementIf your loop-back sound card measurement performed above looks suspicious, we recommend that you first compa

Note: If shown above is not checked, this dialog will not be displayed when a newcurve is added. When you become more familiar with WinMLS you may n

6.1.9 Sound Card TroubleshootingIf the response of your sound card does not look at all like the other sound cards, check that • your settings are cor

If your sound card is not found in the list shown above or you want to make a new gain steps file, click the button to start the mixer gain step calib

Note that the number shown in the figure above is updated after the calibration. It shows the maximuminput level that WinMLS is able to measure (a h

13.18How to find the level difference between stereo speakers?...23513.19How to measure at very low f

This completes the calibration of input channel 1. Note that if you are doing a 2-channel measurement and also wantcalibrated values for channel 2, yo

(A faster method of displaying this dialog box is to click the button on the Standard toolbar.)Follow this procedure step-by-step. In step number 1a

In step number 4b, click the button to open the browse dialog shown below.The file named BAAP is selected. It contains the gain steps for the active

6.2.4 Microphone magnitude frequency response correctionIf you want to plot the frequency response as shown in the figure below, you can apply a corre

Now make sure is checked. Then select the microphone compensation file, in the figure above we haveselected the file named ‘Neutrik 3382 example.txt

6.3.2 Measurement procedureGo to Measurement->Test Levels to display the dialog showing the input and output levels. Adjust the input oroutput volu

Figure 4 Multimedia microphone and loudspeaker measured on axis at a distance of ~20 cm. Time window 50 ms.Note that if the frequency resolution is no

Time [samples]80757065605550454035302520151050uncal. [volts] / uncal. [volts], Linear3 5003 0002 5002 0001 5001 0005000-500 Distance [meter]0,50,450,4

...\Studios\1032ARearRight.w mb...\Studios\1032ARearLeft.w mb...\Studios\1032ALeft.w mb...\Studios\1032ACentre.w mb...\Studios\1032ARight.w mbInitial

1/6 Oct. Smoothed Group Delay - Studio MeasurementsFrequency [Hz]100 1 000 10 000Time [ms]40200-206.4.5 Delay from Frequency Response - Spectrum plot