Method for binary coding of quantization indices of a signal envelope, method for decoding a signal envelope and corresponding coding and decoding modules

A technology of binary coding and signal envelope, applied in the field of audio signal transform coding and binary coding module

Inactive Publication Date: 2009-03-18
FRANCE TELECOM SA
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  • Application Information

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Problems solved by technology

[0043] Furthermore, another problem to be solved by the present invention relates to managing the risk of saturation with respect to signals with high rms values, such as sinusoids

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  • Method for binary coding of quantization indices of a signal envelope, method for decoding a signal envelope and corresponding coding and decoding modules
  • Method for binary coding of quantization indices of a signal envelope, method for decoding a signal envelope and corresponding coding and decoding modules
  • Method for binary coding of quantization indices of a signal envelope, method for decoding a signal envelope and corresponding coding and decoding modules

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Embodiment Construction

[0067] The invention is described in the context of a specific type of hierarchical audio coder operating at 8 kbit / s to 32 kbit / s. However, it must be clearly understood that the methods and modules for binary encoding and decoding of spectral envelopes according to the invention are not limited to this type of encoder and can be applied to any form of Spectral Envelope Binary Encoding.

[0068] As shown in Figure 4, the input signal of the wideband hierarchical encoder sampled at 16kHz is first divided into two subbands by a quadratic image filter (QMF). The low frequency band from 0 to 4000 Hz is obtained by low pass filtering 300 and decimation 301 , and the high frequency band from 4000 to 8000 Hz is obtained by high pass filtering 302 and decimation 303 . In a preferred embodiment, filter 300 and filter 302 have length 64 and are described in the following paper: J. Johnston, "A filter family designed for use in quadrature mirror filter banks", ICASSP, vol.5, pp.291- 2...

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Abstract

The invention concerns a module (402) for binary coding of a signal envelope, comprising a coding module (502) of a first variable length mode. According to the invention, the coding module of a first mode incorporates an envelope saturation detector and said coding module (402) also comprises a second coding module (503) of a second mode, arranged parallel to the coding module (502) of the first mode, and a mode selector (504) capable of maintaining one of the two coding modes, based on a code length criterion and on the result derived from the envelope saturation detector. The invention is applicable to coding by audiofrequency signal transform.

Description

technical field [0001] The invention relates to a method of binary encoding of quantization indices defining a signal envelope. The invention also relates to a binary coded module for implementing the method. The invention also relates to a method and a module for decoding an envelope encoded by the binary encoding method and binary encoding module of the invention. [0002] The invention finds particularly advantageous application in the transmission and storage of digital signals such as audio speech, music, etc. signals. The coding method and coding module of the invention are more particularly suitable for transform coding of audio signals. Background technique [0003] Various techniques exist for digitizing and compressing audio speech, music, etc. signals. The most common methods are: [0004] "Waveform coding" methods such as PCM and ADPCM coding; [0005] "parametric analysis / synthetic coding" methods, such as Codebook Excited Linear Prediction (CELP) coding; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L19/032
CPCG10L19/0212G10L19/032G10L19/00G10L19/18H03M7/30
Inventor 巴拉茨·科维西斯蒂芬·拉戈特
Owner FRANCE TELECOM SA
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