Computes the short-time Fourier transform (STFT)-based spectrogram of signal. Wire data to the signal input to determine the polymorphic instance to use or manually select the instance.


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TFA STFT Spectrogram Details

The STFT spectrogram is the square of the magnitude of the resulting coefficients from the STFT. The STFT spectrogram is non-negative. All the values of the STFT spectrogram are positive. The other time-frequency representations, such as the Wigner-Ville Distribution, the Choi-Williams Distribution, the Cone-Shaped Distribution, and the Gabor spectrogram, can be negative.

Refer to the book Introduction to Time-Frequency and Wavelet Transforms for more information about reassignment.

Examples

Refer to the following VIs for examples of using the TFA STFT Spectrogram VI:

  • Color Tables for Displaying the Spectrogram VI: labview\examples\Time Frequency Analysis\TFAGettingStarted
  • Group Delay VI: labview\examples\Time Frequency Analysis\TFAFunctions
  • Mean Instantaneous Frequency or Bandwidth (MIF or MIB) VI: labview\examples\Time Frequency Analysis\TFAFunctions
  • Time-Frequency Resolution VI: labview\examples\Time Frequency Analysis\TFAGettingStarted