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  • US 9,552,824 B2
  • Filed: 04/12/2016
  • Issued: 01/24/2017
  • Est. Priority Date: 07/02/2010
  • Status: Active Grant
First Claim
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1. An audio decoder for decoding an audio bitstream generated by an audio encoder, the audio decoder comprising:

  • a first decoding module adapted to operate in a first coding mode;

    a second decoding module adapted to operate in a second coding mode, the second coding mode being different from the first coding mode; and

    a pitch filter included in either the first coding mode or the second coding mode, the pitch filter adapted to filter a preliminary audio signal generated by the first decoding module or the second decoding module to obtain a filtered signal,wherein the pitch filter is selectively enabled or disabled based on a value of a first parameter encoded in the audio bitstream, the first parameter being distinct from a second parameter encoded in the audio bitstream, the second parameter specifying a current coding mode of the audio decoder and the pitch filter further de-emphasizes spectral valleys.

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