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Alias cancelling during audio coding mode transitions

  • US RE47,536 E1
  • Filed: 12/15/2017
  • Issued: 07/23/2019
  • Est. Priority Date: 07/27/2009
  • Status: Active Grant
First Claim
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1. A method for processing an audio signal, comprising:

  • receiving, by an audio processing apparatus, an audio signal including a first data of a first block encoded with a rectangular first coding scheme using a rectangular window and a second data of a second block encoded with a non-rectangular second coding scheme using a non-rectangular window;

    generating an output signal for the first block using the first data of the first block based on the rectangular first coding scheme;

    receiving a compensation signal corresponding to the second block;

    obtaining a prediction of an aliasing part by applying a window of the second block to the output signal for the first block; and

    obtaining a reconstructed signal for the second block based on the second data, the compensation signal and the prediction of the aliasing part, wherein, when the first data is encoded with a LPD (Linear Prediction Domain) coding scheme and the window of the second block belongs to a transition window class, the window of the second block has an ascending line with a first slope,wherein the first slope is gentler different than a second slope.

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