Improved encoding of an improvement stage in a hierarchical encoder

A hierarchical encoding and encoder technology, which is applied in the field of embedded code encoding and adaptive waveform encoding, can solve problems such as suboptimal solutions and high complexity, and achieve the effect of avoiding dictionary duplication

Inactive Publication Date: 2013-10-23
FRANCE TELECOM SA
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Problems solved by technology

This in turn entails a great deal of complexity and significant storage of refinement terms or reconstructed signal samples from previous stages
[0046] Therefore, this solution is not optimal from a complexity point of view

Method used

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  • Improved encoding of an improvement stage in a hierarchical encoder
  • Improved encoding of an improvement stage in a hierarchical encoder
  • Improved encoding of an improvement stage in a hierarchical encoder

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Embodiment Construction

[0088] refer to image 3 , describes an encoder and an encoding method according to an embodiment of the present invention.

[0089] Recall that the case of embedded code encoders or hierarchical encoders is considered here, where a core encoding with B bits and at least one refinement stage of rank k is envisaged. For example the core coding and refinement stages preceding the encoding of the improvement stage k represented at 306 give an index I at B+k-1 bits per sample B+k-1 Scalar quantization metrics for multiplexing in (n).

[0090] In the exemplary embodiments described below, for simplicity of presentation, the stages of improvement (of level k) are represented as generating extra bits per sample. In this case, encoding in each refinement stage involves choosing one of two possible values. As will be apparent later, the size of the "absolute dictionary" associated with an absolute level (in terms of "non-difference") corresponding to all quantized values ​​that can ...

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Abstract

A method and coding device are provided for coding a digital audio input signal in a hierarchical coder, which includes a core coding stage with B bits and at least one current improvement coding stage k, delivering quantization indices which are concatenated to form the indices of a preceding embedded coder. The method includes: obtaining possible quantization values for the current improvement stage k by determining absolute reconstruction levels of just the current stage k on the basis of the indices of the preceding embedded coder; and quantizing the input signal of the hierarchical coder having undergone or not a perceptual weighting processing, on the basis of the possible quantization values so as to form a scalar quantization index for the stage k and a quantized signal corresponding to one of the possible quantization values.

Description

technical field [0001] The invention relates to the field of digital signal encoding. [0002] The encoding according to the invention is particularly suitable for the transmission and / or storage of digital signals, eg audio signals (speech, music, etc.). [0003] The invention more particularly pertains to waveform coding such as PCM ("Pulse Code Modulation") coding or adaptive waveform coding of the ADPCM ("Adaptive Differential Pulse Code Modulation") coding type. The invention belongs in particular to embedded code coding, making it possible to give scalable binary string quantization indices. Background technique [0004] For example reference figure 1 with 2 To describe the general principle of embedded code ADPCM encoding / decoding specified by ITU-T Recommendation G.722 or ITU-T G.727. [0005] figure 1 Thus denoting ADPCM-type embedded code encoders operating between B and B+K bits per sample (e.g. G.722 low-band, G.727); note non-scaling ADPCM codes (e.g. G.726...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L19/14G10L19/032G10L19/24
CPCG10L19/032G10L19/00G10L19/24G10L19/0208G10L19/02G10L19/06
Inventor B.科维西S.拉格特A.勒古亚德
Owner FRANCE TELECOM SA
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