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Encoding of an audio-digital signal with noise transformation in a scalable encoder

A technology of hierarchical coding, digital audio, applied in speech analysis, instrumentation, transcoding, etc., can solve problems such as increasing the complexity of the decoder

Active Publication Date: 2013-05-08
FRANCE TELECOM SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0044] Additional computation of the filter at the decoder increases the complexity of the decoder
[0045] This technique is not used in standard scalable decoders of the type already existing G.722 or G.727 decoders

Method used

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  • Encoding of an audio-digital signal with noise transformation in a scalable encoder
  • Encoding of an audio-digital signal with noise transformation in a scalable encoder
  • Encoding of an audio-digital signal with noise transformation in a scalable encoder

Examples

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Embodiment Construction

[0106] In the rest of this document, the term "prediction" is used systematically to describe computations that use only past samples.

[0107] refer to Figure 5 , an embedded code encoder according to the present invention is now described. It is important to note that encoding is performed with an enhancement stage providing one bit per oversampled. Here, this constraint is only used to simplify the presentation of the invention. However, it is clear that the invention described hereinafter can easily be generalized to the case where the enhancement stage provides more than one bit per sample.

[0108] This encoder comprises a core bitrate encoding stage 500 with quantization over B bits, for example of an ADPCM encoding type such as a standardized G.722 or G.727 encoder, or A PCM (“Pulse Code Modulation”) encoder, such as a G.711 standardized encoder, which is modified as a function of the output of block 520 .

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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.

Description

technical field [0001] The invention relates to the field of encoding of digital signals. [0002] The encoding according to the invention is particularly suitable for the transmission and / or storage of digital signals such as audio signals (speech, music or other). [0003] The invention relates more particularly to waveform coding of the ADPCM (stands for "Adaptive Differential Pulse Code Modulation") coding type, and in particular to coding of the ADPCM type using embedded codes making it possible to transfer quantization indices using scalable binary strings . Background technique [0004] such as, reference figure 1 and 2 To describe the general principle of the embedded code ADPCM encoding / decoding specified in the protocol ITU-T G.722 or ITU-T G.727. [0005] thus, figure 1 represents an embedded code encoder of the ADPCM type. [0006] it includes: [0007] - Prediction module 110 for making possible based on the quantization error signal (where v(n′) is a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/24G10L19/26G10L19/04
CPCG10L19/04G10L19/24G10L19/265G10L19/005H03M7/30
Inventor 巴拉兹.科维西斯蒂芬.拉戈特阿兰.勒古亚德
Owner FRANCE TELECOM SA
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