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Pitch filter for audio signals

  • US 9,858,940 B2
  • Filed: 03/31/2016
  • Issued: 01/02/2018
  • Est. Priority Date: 07/02/2010
  • Status: Active Grant
First Claim
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1. A pitch filter for filtering a preliminary audio signal generated from an audio bitstream, the pitch filter having an operating mode selected from one of either:

  • (i) an active mode where the preliminary audio signal is filtered using filtering information to obtain a filtered audio signal, and(ii) an inactive mode where the pitch filter is disabled;

    wherein the preliminary audio signal is generated in an audio decoder operating in a coding mode selected from at least two distinct coding modes, and the pitch filter is capable of being selectively operated in either the active mode or the inactive mode based on control information while the audio decoder is operating in the coding mode, andwherein the control information is a parameter one bit in length, and a first value of the parameter indicates that the pitch filter should be operated in the active mode and a second value of the parameter indicates that the pitch filter should be operated in the inactive mode.

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