CODING WITH NOISE SHAPING IN A HIERARCHICAL CODER
First Claim
1. A method of hierarchical coding of a digital audio signal comprising, for a current frame of the input signal:
- performing, on a processor, a core coding, delivering a scalar quantization index for each sample of the current frame andperforming, on the processor, at least one enhancement coding delivering indices of scalar quantization for each coded sample of an enhancement signal,wherein the enhancement coding comprises a step of obtaining a filter for shaping coding noise used to determine a target signal and the indices of scalar quantization of said enhancement signal are determined by minimizing error between a set of possible values of scalar quantization and said target signal.
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Abstract
A method is provided for hierarchical coding of a digital audio signal comprising, for a current frame of the input signal: a core coding, delivering a scalar quantization index for each sample of the current frame and at least one enhancement coding delivering indices of scalar quantization for each coded sample of an enhancement signal. The enhancement coding comprises a step of obtaining a filter for shaping the coding noise used to determine a target signal and in that the indices of scalar quantization of said enhancement signal are determined by minimizing the error between a set of possible values of scalar quantization and said target signal. The coding method can also comprise a shaping of the coding noise for the core bitrate coding. A coder implementing the coding method is also provided.
121 Citations
21 Claims
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1. A method of hierarchical coding of a digital audio signal comprising, for a current frame of the input signal:
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performing, on a processor, a core coding, delivering a scalar quantization index for each sample of the current frame and performing, on the processor, at least one enhancement coding delivering indices of scalar quantization for each coded sample of an enhancement signal, wherein the enhancement coding comprises a step of obtaining a filter for shaping coding noise used to determine a target signal and the indices of scalar quantization of said enhancement signal are determined by minimizing error between a set of possible values of scalar quantization and said target signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21)
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14. A hierarchical coder of a digital audio signal for a current frame of the input signal comprising:
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a core coding stage, delivering a scalar quantization index for each sample of the current frame; and at least one enhancement coding stage delivering indices of scalar quantization for each coded sample of an enhancement signal, wherein the enhancement coding stage comprises a module for obtaining a filter for shaping the coding noise used to determine a target signal and a quantization module delivering the indices of scalar quantization of said enhancement signal by minimizing the error between a set of possible values of scalar quantization and said target signal.
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Specification