Sound Cards that do not work with the MLS measurement method
Sound Cards that have been tested to work with WinMLS
The first measurements walk-through
Measurement 1: Measuring the sound card response
Measurement 2: Measurements requiring input calibration
Preparation: Calibrating the gain steps of your mixer
Combined input calibration example: Calibrating to measure absolute SPL
Individual calibration example: Measuring voltage using an adjustable attenuator
Measurement 3: A simple loudspeaker measurement
Finding delay from Time Data plot type
Delay/Distance from Parameters plot type
Delay from Room Acoustics plot type
Measurement 4: Measure correct delay and frequency response using channel 2 as reference
Measurement 5: Measure correct frequency response and delay using internal reference
Measurement 6: Measure in a "safe" way using loop-back
Loop-back measurement procedure
This happens during a loop-back measurement
What to do if the loop-back synchronization signal not strong enough
Measurement 7: How to measure correct delay time when using the sound card mono microphone input
Measurement 8: Measuring 2 channels simultaneously
Synchronization Loop Connection for 2-channel Measurement
2-channel loop-back for sound cards with one input only
2-channel loop-back for sound cards with two inputs (e.g. line and microphone input)
Synchronization Loop-back Connection for Mono Full Duplex Sound Cards
Measurement 9: Performing a triggered measurement (e.g. balloon burst, or pistol shot)
Measurement 10: Short guide to reverberation time measurements
Post-processing 1: Katz room acoustical parameters round robin (published in JASA)
Post-processing 2: Measurement System Comparison NPL Surrey 2002
Troubleshooting and Known Issues
My sound card does not seem to work correctly?
Why is it impossible to control the input level with the WinMLS mixer?
My frequency response measurements look too flat, why?
Problem after changing preferred sound devices
I can hear feedback, how can it be turned off?
Why does a small change the in volume settings in WinMLS give no effect?
Trouble with WinMLS evaluation period
Double-clicking in the plot will not open the plot type settings dialog
Abnormal termination on shutdown
Plot settings toolbar supports maximum 4 decimals.
Auto-scaling of y-axis maximum value
A tip that will avoid WinMLS to crash
Special case: If two plots are displayed showing the same plot type.
Opening or saving as 24 or 32 bits .wav-files is not possible in this version
How to get started analyzing measurements files (e.g. wav files)?
How to solve a problem with WinMLS?
How to transfer the license from one computer to another computer
I don't like the way the toolbars are positioned, can I do something about it?
How to change the vertical axis from Volt to appear in dB [Pa] or SPL?
How to calibrate the input of the measurement system?
How to calibrate the output of the measurement system?
How to measure using an external source?
Measure with signal from a CD-player
How to make a new wizard or edit an existing wizard?
How to add a new language to the wizard?
How to auto-name when saving measurements?
What does the Windows sound card mixer do when WinMLS is set to control it?
How to get fine resolution on the WinMLS mixer and signal generator slider?
What format is recommended for saving measurement data?
How to convert a measurement file, e.g. of extension .wmb to .wav?
How to improve signal-to-noise ratio for low frequencies?
How to add pre-filtering (emphasis) to the excitation signal?
How to check the background noise spectrum of an impulse response measurement?
What is causing sine sweep artifacts such as pre-ringing?
How to access a measurement from memory?
How to run WinMLS as batch file?
Can a given setup be automatically called using DOS switches?
How to open WinMLS with different setups?
How to read WinMLS files in Matlab?
How to run WinMLS as a function from Matlab?
What is the highest sampling rate available (important for e.g. scale modeling in room acoustics)?
Can multi-channel measurements (>2 input channels) be performed using WinMLS?
How to get the size of the measured impulse response to be a power of two (2N)?
How to write a program for reading the WinMLS .wmb file format
FAQ: Plotting and Post Processing
Plotting - general information
How to set the plot type (e.g. to waterfall) and determine what measurement is to be plotted?
How to access the settings for the plot type?
How to change the vertical axis scaling?
Why is the phase shift not within 360 degrees when measuring with WinMLS?
How to filter a measurement, e.g. using a bandpass filter?
How to change the color of a waterfall plot?
What toolbars are useful when working with a waterfall plot?
What waterfall calculation mode should be used?
If waterfall is plotted, how to read the value of a specific waterfall slice?
How to set the depth of the waterfall plot?
When plotting waterfall, how to select the start point?
The right part of my waterfall look strange, how can I fix this?
How to set the time data window when plotting in frequency domain?
Where are the plot cursor values (x,y) displayed?
Where is the wavelength displayed?
How to change the wavelength unit from meters to feet?
How to save the curve data in the plot?
How to save the plot as a picture?
How to view and manipulate the data of the plotted curves?
How to make calculations, such as subtraction?
How to plot the level of a measurement in octave or one-third-octave bands?
Why can I not see the (one-third)-octave values below 40 Hz?
How to plot the smoothed curves more 'graceful'
How to plot spectrum in octave or one-third-octave bands?
How to validate numbers typed in the Plot Toolbar?
How to limit the plotting range, e.g. plotting only in the range 100-5000 Hz?
How to change the curve style (color, type and width)?
How to change the background color
How to plot figures in black and white only (e.g. for publishing articles)?
How to change the order of curves?
How to erase curves from the plot?
How to choose between plotting several curves and a single curve?
How to display one single curve and set the other curves as invisible?
How to display the legend (a list of the curves that are in the plot)?
How to "turn off" a single curve from the plot without deleting it?
When printing a plot, why is the plot squeezed to the left corner?
How to change the text (and the title, sub title, sub foot, foot) and to store these settings?
How to change the names displayed in the legend?
How to move the legend to an arbitrary position, e.g. inside the plot?
The legend list is filled up, how to solve this?
How to access zoom options, e.g. to turn the mouse zooming on/off ?
How to zoom the plot with the mouse?
Personal versions only: How to move the curves away from the nag screen?
How to scroll the plot using the mouse?
How to turn on and modify gridlines
The left axis labels is wrong, how to change this?
How to set the axis labels format?
How to set the axis label increment?
How to display the numerical values of the Magnitude Frequency Response Guidelines?
How to find the maximum frequency and its value?
How to add a box displaying the cursor values?
How to delete a text box from a plot?
How to add cursor values and a box with custom text to a plot?
How to add a cursor that follows a curve?
How to make a cursor to follow a curve when there are several curves of the same measurement?
How can curves in the plot remain so that they are there when WinMLS is restarted?
How to print graphs at very high quality
How to remove PASSED/FAILED text from the plot area?
How to measure room acoustics?
How are room acoustics parameters presented?
How to set manual start of the impulse response?
How can the Room Acoustics Parameters Grid be copied to a spreadsheet (e.g., Excel)?
How to fix problems with the formatting when pasting room acoustics parameters to Excel?
How to fix problems with the formatting when reading a room acoustics parameters text-file to Excel?
Is the relationship between T30 and T60 linear, so that T60=2*T30?
Strength ISO 3382 Calibration Procedure
How to detect echoes from a measured impulse response?
Why does the relative axis of the map not always quite follow the yellow time limit line?
How to specify two measurements for computing room acoustics parameters?
How to change the bandwidth, e.g. obtain the reverberation time of the broadband measurement?
How to filter and display the time data (impulse response) for a given frequency?
Batch processing: How to automatically compute room acoustics parameters from several measurements?
How to average room acoustics parameters obtained from several measurements?
Is there a way of automatically sending measurement channel two to the lower plot?
How to change the horizontal axis of the Room Acoustics Parameters plot type?
How is the criterion in the automatic detection of the initial time delay of the impulse response?
Where to find information about the WinMLS setups?
How to measure loudspeaker frequency response?
How to set EQ based on measurements in multiple positions?
How to measure velocity, acceleration and force with WinMLS?
How to measure vibrations with WinMLS?
How to perform automated measurements with WinMLS, e.g. using a turntable?
A frequency resolution of 1 Hz is desired, how to set the frequency resolution?
How to plot harmonic distortion for a sinusoidal signal?
How to measure loudspeaker frequency response and use SPL as vertical axis?
How to set the output signal amplitude to a calibrated value, e.g. 2.83 VoltsRMS?
How to measure loudspeaker directivity?
How to measure levels, such as in octaves and dBA?
How to use WinMLS as a level meter for measuring SPL values in octave, 1/3 octave, dBA?
How to find the level of a measured impulse response (for example in dBA)?
How to display the level in octave bands?
How to display the level in dBA?
How to display several measurements (e.g., for comparison and for saving the data)?
How to calculate Loudness/Sone (ISO 532B / DIN 45631)?
How to measure speech transmission indices, such as STI and RASTI?
The background noise is "normal"
The background noise is "too high"
The background noise is "normal" but is varying a lot
The background noise is "too low"
I am measuring the speech parameters of an acoustical system (a room) and not a sound system
How to measure loudspeaker impedance?
How to find the level difference of two measurements as function of frequency?
How to find the level difference between stereo speakers?
Setting the lower x-axis limit
Setting the upper x-axis limit
Setting the lower y-axis limit
Setting the upper y-axis limit
Clear Memory->Active Measurement
Clear Memory->All Measurements
Plot Type Settings: Active Plot...
Plot Type Settings: General Frequency Domain Settings...
Plot Type Settings: Time Window...
Plot Type Settings: Frequency Response/Spectrum...
Plot Type Settings: Phase Frequency Response/Function...
Plot Type Settings: Group Delay...
Plot Type Settings: Waterfall...
Plot Type Settings: Room Acoustics...
Plot Type Settings: Parameter...
Plot Type Settings: Time Data…
Plot Type Settings: Integrated Time Data (Step Response)...
Plot Type Settings: Energy-time Curve
Plot Type Settings: Schroeder Curve…
Airborne Sound Insulation Measurement
Get started measuring airborne sound insulation
Measurement settings for traditional standard (ISO 140-4)
Measurement settings for new standard (ISO/WD 18233)
Performing measurement and plotting data
Print/copy measurement results
Exporting measurement results as text
Listening and correcting for measurement errors
Saving the measurement data and plots for later usage