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Non-speech content for low rate CELP decoder

  • US 9,252,728 B2
  • Filed: 11/02/2012
  • Issued: 02/02/2016
  • Est. Priority Date: 11/03/2011
  • Status: Active Grant
First Claim
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1. A device for modifying a synthesis of a time-domain code-excited linear prediction (CELP) excitation decoded by a time-domain CELP decoder, comprising:

  • at least one processor; and

    a memory coupled to the processor and comprising non-transitory instructions that when executed cause the processor to implement;

    a classifier of the synthesis of the decoded time-domain CELP excitation into one of a number of categories;

    a first converter of the decoded time-domain CELP excitation into a frequency-domain excitation;

    a modifier of the frequency-domain excitation as a function of the category in which the synthesis of the decoded time-domain CELP excitation is classified by the classifier;

    a second converter of the modified frequency-domain excitation into a modified time-domain CELP excitation; and

    a first linear prediction synthesis filter supplied with the modified time-domain CELP excitation to produce a modified synthesis of the decoded time-domain CELP excitation.

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