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Method of making a window type decision based on MDCT data in audio encoding

  • US 7,325,023 B2
  • Filed: 09/29/2003
  • Issued: 01/29/2008
  • Est. Priority Date: 09/29/2003
  • Status: Active Grant
First Claim
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1. A method of execution by a computer, the method comprising:

  • detecting an indication of a transition from a steady signal to a transient signal in a next frame of audio data;

    deciding that a preliminary window type of the next frame is a short window type; and

    determining a window type of a current frame of data based on the preliminary window type of the current frame and a window type of a previous frame of data, the determination of the window type of the current frame favoring use of a long window type over use of the short window type, wherein the audio data is transformed into a frequency domain using a transformation range defined by the window type.

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