Method and device for adaptive bandwidth pitch search in coding wideband signals

  • US 7,260,521 B1
  • Filed: 10/27/1999
  • Issued: 08/21/2007
  • Est. Priority Date: 10/27/1998
  • Status: Expired due to Term
First Claim
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1. A pitch analysis device for producing a set of pitch codebook parameters, comprising:

  • a pitch codebook search device configured to generate a pitch code vector based on a digitized input audio data, wherein said digitized input audio data represents an input audio signal that has been sampled and digitized;

    a) at least two signal paths associated to respective sets of pitch codebook parameters representative of said digitized input audio data, wherein;

    i) each signal path comprises a pitch prediction error calculating device for calculating a pitch prediction error of said pitch codevector from said pitch codebook search device; and

    ii) at least one of said at least two signal paths comprises a filter for filtering the pitch codevector before supplying said pitch codevector to the pitch prediction error calculating device of said at least one signal path; and

    b) a selector for comparing the pitch prediction errors calculated in said at least two signal paths, for choosing the signal path having the lowest calculated pitch prediction error and for selecting the set of pitch codebook parameters associated to the chosen signal path.

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