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Unified speech/audio codec (USAC) processing windows sequence based mode switching

  • US 10,002,619 B2
  • Filed: 07/01/2016
  • Issued: 06/19/2018
  • Est. Priority Date: 11/26/2008
  • Status: Active Grant
First Claim
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1. An encoding method for Unified Speech and Audio Codec (USAC), comprising:

  • by one or more processor processing a computer executable instruction, when executed;

    determines a first window for a previous frame,determines a second window for a current frame,modifies a left portion of the second window based on the first window, when a switching occurs between the previous frame and the current frame, andencodes an input signal of the current frame using the modified second window,wherein the left portion of the second window is a region for overlap-add operation with the first window based on a folding point located at a boundary between the previous frame and the current frame, andwherein the processor modifies a shape of the left portion of the second window and modifies a size of the left portion of the second window, and the input signal is encoded by the processor by performing the overlap-add operation with respect to the second window including the left portion modified based on the first window.

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