TFA Group Delay VI

LabVIEW 2014 Advanced Signal Processing Toolkit Help

Edition Date: June 2014

Part Number: 372656C-01

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Owning Palette: Feature Extraction VIs

Requires: Advanced Signal Processing Toolkit

Computes the group delay of a signal from the spectrogram of the signal.

Details  Example

spectrogram specifies the quadratic time-frequency representation of a signal. Use the Time Frequency Spectrogram VIs to compute the spectrogram of the signal.
scale info specifies the time scale information and the frequency scale information of the time-frequency representation.
error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
group delay returns the time delay of the signal at each frequency bin.
f0 returns the lowest value of the frequency bins in hertz.
df returns the interval between the frequency bins in hertz.
delay returns the time delay at each frequency bin in seconds.
error out contains error information. This output provides standard error out functionality.

TFA Group Delay Details

The following equation defines the group delay:

where is the spectrogram of the signal. The spectrogram can result from any Time Frequency Spectrogram VI.

Example

Refer to the Group Delay VI in the labview\examples\Time Frequency Analysis\TFAFunctions directory for an example of using the TFA Group Delay VI.

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