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Recovering high frequency band signal of a lost frame in media bitstream according to gain gradient

DC
  • US 10,614,817 B2
  • Filed: 07/24/2018
  • Issued: 04/07/2020
  • Est. Priority Date: 07/16/2013
  • Status: Active Grant
First Claim
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1. A method for recovering a lost frame of a media bitstream, comprising:

  • obtaining a synthesized high frequency band signal of a current lost frame;

    obtaining recovery information related to the current lost frame, wherein the recovery information comprises a coding mode of a previous frame and a frame class of a last frame received before the current lost frame;

    determining a global gain gradient of the current lost frame according to the recovery information;

    determining a global gain of the current lost frame according to the global gain gradient and a global gain of each frame in previous M frames of the current lost frame, wherein M is a positive integer;

    determining a subframe gain of the current lost frame; and

    adjusting the synthesized high frequency band signal of the current lost frame according to the global gain of the current lost frame and the subframe gain of the current lost frame to obtain a high frequency band signal of the current lost frame.

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