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Self-adaptation adjusting method for improving apperceive quality of g.711

A technology for adaptive adjustment and perceived quality, applied in the field of signal coding

Active Publication Date: 2013-11-06
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The above weighting filters are only used on the encoder side

Method used

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  • Self-adaptation adjusting method for improving apperceive quality of g.711
  • Self-adaptation adjusting method for improving apperceive quality of g.711
  • Self-adaptation adjusting method for improving apperceive quality of g.711

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Embodiment Construction

[0041] G.711 features using general weighting filters

[0042] G.711 is an ITU voice and audio codec standard widely used in early communication systems. G.711 is a PCM based codec. Each signal sample is coded with 8 bits. If the sample rate is 8kHz, the resulting codec has a bit rate of 64 kbit / s. G.711 can be used alone or as a scalable codec core. G.711 has two encoding methods, one is called A-law and the other is called μ-law. They all use scalar quantization methods. The size of the quantization step varies with the magnitude of the signal sample, ie it can be 8, 16, 32, 64, ... and so on. If we define absolute quantization error and relative quantization error as follows:

[0043] Absolute Error = | s ( n ) - s ^ ( n ) | , - - - ...

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Abstract

In order to achieve the best improvement of ITU G.711 related codec perceptual quality, perceptual weighting controlling parameter(s) should be at least adaptive to relative quantization error statistics or adaptive to signal level. When the relative quantization error statistics are larger or the signal level is lower, the perceptual weighting should be "stronger"; when the relative quantization error statistics are smaller or the signal level is larger, the perceptual weighting should be "weaker".

Description

technical field [0001] The present invention belongs to the field of signal coding. Especially in the field of speech / signal coding and the field used by ITU G..711A-law or G..711μ-law codecs. Background technique [0002] About the ITU G.711 codec standard [0003] G.711 is an early International Telecommunications Union (ITU) voice and audio codec standard that has been widely used in communication systems. G.711 is a PCM based codec. Each signal sample is coded with 8 bits. If the sampling rate is 8 kHz, the resulting codec has a bit rate of 64 kbit / s. The ITU recommends two coding schemes, which are commonly referred to as A-law and μ-law. Definitions of these methods are published in diagrams published by ITU. When using the μ-law in the network, it is necessary to suppress all zero character signals. The character signal, the corresponding negative input value signal between the decision value 127 and 128, should be 00000010. The corresponding decoder output va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/26
CPCH04B14/04G10L21/0208G10L19/26
Inventor 高扬
Owner HUAWEI TECH CO LTD