Alias cancelling during audio coding mode transitions
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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Abstract
An apparatus for processing an audio signal and method thereof are disclosed. The present invention includes receiving, by an audio processing apparatus, an audio signal including a first data of a first block encoded with rectangular coding scheme and a second data of a second block encoded with non-rectangular coding scheme; receiving a compensation signal corresponding to the second block; estimating a prediction of an aliasing part using the first data; and, obtaining a reconstructed signal for the second block based on the second data, the compensation signal and the prediction of aliasing part.
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Citations
10 Claims
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1. A method for processing an audio signal, comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for processing an audio signal, comprising:
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a de-multiplexer receiving 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, and receiving a compensation signal corresponding to the second block; a rectangular decoding unit generating an output signal for the first block using the first data of the first block based on the rectangular first coding scheme, and obtaining a prediction of an aliasing part by applying a window of the second block to the output signal for the first block; and a non-rectangular decoding unit 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. - View Dependent Claims (7, 8, 9, 10)
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Specification