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Selective bass post filter

  • US 9,224,403 B2
  • Filed: 06/23/2011
  • Issued: 12/29/2015
  • Est. Priority Date: 07/02/2010
  • Status: Active Grant
First Claim
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1. A decoder system for decoding a bit stream signal as an audio time signal, the decoder system including:

  • a decoding section for decoding the bit stream signal as a preliminary audio time signal, wherein the decoding section comprises a code-excited linear prediction, CELP, decoding module and a transform-coded excitation, TCX, decoding module; and

    an interharmonic noise attenuation post filter adapted to receive the preliminary audio time signal, and to supply the audio time signal, wherein the post filter comprises a control section for selectively operating the post filter in one of the following modes;

    i) a filtering mode, wherein the post filter filters the preliminary audio time signal to obtain a filtered signal and supplies the filtered signal as the audio time signal; and

    ii) a pass-through mode, wherein the post filter supplies the preliminary audio time signal as the audio time signal,wherein the decoder system selectively operates in one of the following modes;

    a) the TCX module is enabled and the post filter is operated in the pass-through mode;

    b) the CELP module is enabled and, in response to a post-filtering signal, the post filter is operated in the filtering mode; and

    c) the CELP module is enabled and, in response to the post-filtering signal, the post filter is operated in the pass-through mode.

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