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Short-term enhancement in CELP speech coding

  • US 6,678,651 B2
  • Filed: 01/25/2001
  • Issued: 01/13/2004
  • Est. Priority Date: 09/15/2000
  • Status: Expired due to Term
First Claim
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1. A speech communication system comprising:

  • an adaptive codebook that characterizes a speech segment;

    a fixed codebook that characterizes the speech segment and generates an excitation, wherein said excitation is scaled by an adaptive factor to generate a scaled signal;

    a filter configured to filter the scaled signal by an enhancement that emphasizes the formants of a Linear Prediction Coding spectrum to generate a filtered signal;

    a summer configured to sum the filtered signal with an output of the adaptive codebook to generate a summed signal;

    a convolver configured to convolve the summed signal to generate a convoluted signal; and

    a synthesizer configured to filter the convoluted signal.

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