Labview2012 and NI Advanced Signal Processing Toolkit suite developed frequency compression based procedures, can set the frequency compression ratio, and image shows the spectrum before and after the compression.

Frequency Compression\keygo_Frequency Compression Demo.vi
.....................\Source
.....................\......\keygo_Frequency Compression.vi
.....................\......\Subs
.....................\......\....\fc_interpolation in TF domain.vi
.....................\......\....\pc_Phase Vocoder.vi

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