Spectrum Visual Properties

Spectrum displays a simple frequency graph. The horizontal axis is frequency in Hertz (Hz) and the vertical axis is magnitude in decibels (dB).

Spectrum Settings
Setting Description
Automatic full frequency range Automatically sets the frequency (horizontal) axis range to match the current sampling rate of the file. For a sampling rate of 44100Hz the range is set from 0 to 22050Hz (the Nyquist rate).
Fixed frequency range Allows the frequency (horizontal) axis range to be set manually, giving more frequency detail within that range.
From (Hz),
To (Hz)
Sets the frequency range when Fixed frequency range is selected.
Show axis Shows numbers on the horizontal and vertical axes.
Logarithmic Changes the frequency (horizontal) axis from linear to logarithmic.
Solid Fills the area under the spectrum graph with a solid colour.
Peak line Displays a red peak graph showing the highest magnitudes since playback or recording started. Use the stop button to reset the peak line the next playback or recording is started.
Average line, alpha Displays a yellow average graph showing an approximation of the average magnitudes since playback or recording started. It is not a true average, but a low pass filtered difference of magnitudes in time as follows:

M = alpha * Mprevious + (1 - alpha) * Mnew

Use alpha to change the rate at which the average changes. A value of 0.999 causes the average to change very slowly. A value of 0.800 causes it to change quickly.

Use the stop button to reset the average line the next playback or recording is started.