Vectorscope / Goniometer / Phasemeter

The Vectorscope also known as a Goniometer is a powerful and widely used tool for monitoring stereo signals. Originally it came from traditional analog oscilloscope. The first channel is send to the x-input the other channel is send to the y-axis input.

With little training this display gives a fast overview of a stereo signal and the phase relation between the channels. The picture below shows a typical example for music.




Dot or line display

Persistent display with fading effect

Adjustable decay time 

Free rotation

Free size of display


The display is optimized for fast attack times combined with a maximum of information. Instead of single pixels you can activate lines with a special persistent view. In contrast to analog oscilloscope you can even adjust the persistent time. We use a special exponential decay profile.


You can rotate the display by +45 or -45 degrees or with an arbitrary angle. With these optional rotations, mono signal are on the main axis.



With the multi channel features of WinAudioMLS you can monitor up to 32 stereo pairs simultaneously. You can combine it freely with normal spectral displays.



With the channel matrix you can assign all available channels to each vector display.

The Vectorscope display is freely scalable.


This dialog box shows the configuration for the Vectorscope.



For several signal scenarios you get typical Vectorscope displays. All example displays were generated with no rotation.


1.1.1       Both channels zero

For a zero signal you get a single dot in the middle of the display.



1.1.2        First channel zero

If the first channel is zero, all display dots are on the y-axis.



1.1.3        Second channel zero

If the second channel is zero, all display dots are on the x-axis.



1.1.4       Mono signal

If both channels are identical, the signal dots are on the diagonal line.



1.1.5       Signal with 3dB level difference

If the level differs between both channels, the signal dots are on a single line with a different angle. The following example has level difference of 3dB between both channels.



1.1.6       Signal with 180 degree phase difference

If both channels have a phase difference of 180 degree, you get the following plot.



1.1.7       Lissajous figures

With sine signals as input you can view the famous Lissajous figures. If the phase shift is exactly 90 degrees, you get a circle. This figure is very sensitive to frequency or phase  variations between both channels. Such figures are widely used for e.g. azimuth adjustment of tape recorders.











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Last modified: Februar 25, 2009