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


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Inputs/Outputs

  • c2ddbl.png spectrogram —

    spectrogram specifies the quadratic time-frequency representation of a signal.

    Use the Time Frequency Spectrogram VIs to compute the spectrogram of the signal.

  • cfxdt.png scale info —

    scale info specifies the time scale information and the frequency scale information of the time-frequency representation.

  • cerrcodeclst.png error in (no error) —

    error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

  • icclst.png group delay —

    group delay returns the time delay of the signal at each frequency bin.

  • idbl.png f0 —

    f0 returns the lowest value of the frequency bins in hertz.

  • idbl.png df —

    df returns the interval between the frequency bins in hertz.

  • i1ddbl.png delay —

    delay returns the time delay at each frequency bin in seconds.

  • ierrcodeclst.png error out —

    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.

    Examples

    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.