Extending Signals (Advanced Signal Processing Toolkit)

LabVIEW 2014 Advanced Signal Processing Toolkit Help

Edition Date: June 2014

Part Number: 372656C-01

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Note  This topic contains information that applies to the LabVIEW Time Frequency Analysis Tools and the LabVIEW Wavelet Analysis Tools.

Signal extension methods pad the borders of a signal to lessen discontinuity that might exist at the beginning and end of the signal. The Time Frequency Analysis Tools and Wavelet Analysis Tools provide the following three extension methods.

  • Zero—Uses zeros to pad the borders of a signal.
  • Symmetric—Replicates a signal to pad the borders of that signal. The symmetric extension method left-flips the signal replication at the beginning of the signal and right-flips the signal replication at the end of the signal.
  • Periodic—Replicates a signal to pad the borders of that signal. The periodic extension method adds a signal replication before the signal and another signal replication after the signal.

The following figure shows a linear chirp signal and the extended versions of this signal with the zero, symmetric, and periodic padding methods.

In the previous figure, the linear chirp signal appears from 100 s to 355 s. Notice the appearance of the extended signal when different extension methods pad the signal before 100 s and after 355 s.

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