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Post-Processing Library<br />

PSD<br />

PSD<br />

Eldo built-in DSP function<br />

Calculates the Power Spectral Density (PSD) of a waveform. The PSD of a signal waveform is<br />

an average measure of its time domain properties and therefore especially relevant when the<br />

signal is random.<br />

Tip<br />

There are two methods available for calculating the PSD, namely the Correlogram and<br />

Periodogram methods. For more explanation refer to the Autocorrelation Function and<br />

Power Spectral Density section in the EZwave User’s and Reference Manual.<br />

Usage<br />

set wv_out [psd $wv_in $method]<br />

set wv_out [psd $wv_in $method $nbpts]<br />

Arguments<br />

• wv_in<br />

The input waveform the function is acting upon.<br />

• method<br />

Select the PSD calculation method.<br />

0 for correlogram (default)<br />

1 for periodogram<br />

• nbpts<br />

Number of points for the PSD result.<br />

Return Values<br />

wv_out is the resulting output waveform.<br />

Eldo® User's Manual, 15.3 1229

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