Speech playback speed change using wavelet coding, preferably sub-band coding

  • US 6,009,386 A
  • Filed: 11/28/1997
  • Issued: 12/28/1999
  • Est. Priority Date: 11/28/1997
  • Status: Expired due to Term
First Claim
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1. A method of changing the playback speed of a digitised time domain audio signal which has been transformed into a wavelet coded audio signal comprising a stream of frames, comprising:

  • selecting periodic ones of frames from said stream of wavelet coded frames;

    modifying said stream of wavelet coded frames by dropping said selected frames from said wavelet coded audio signal to leave a modified stream of frames or by replicating said selected frames and including said replicated frames in said wavelet coded audio signal to form a modified stream of frames;

    wavelet decoding consecutive frames of said modified stream of frames to construct a modified time domain signal which approximates pitch of said digitised time domain audio signal but has a different playback speed.

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