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Method and apparatus for audio decoding

A decoding method and audio signal technology, which is applied in the field of audio decoding, can solve problems such as the discomfort of the human ear, and achieve the effect of comfortable hearing experience

Active Publication Date: 2008-12-31
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This sudden change in bandwidth is called bandwidth switching. Since the high and low bands have different contributions to the human ear experience, such frequent switching will bring obvious discomfort to the human ear.

Method used

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  • Method and apparatus for audio decoding

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Embodiment Construction

[0036] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] In Embodiment 1 of the present invention, an audio signal decoding method such as image 3 As shown, the specific steps are as follows:

[0038] Step S301. Determine the frame structure of the received encoded code stream.

[0039]Step S302, detect whether the audio signal corresponding to the coded code stream has switched from a wider bandwidth to a narrower bandwidth according to the frame structure of the coded code stream, if a switch occurs, go to step S303, otherwise, follow the normal decoding process to encode The code stream is decoded and the reconstructed audio signal is output.

[0040] Generally speaking, in the field of speech coding and decoding, narrowband signals refer to signals with a frequency band of 0-4000 Hz, broadband signals refer to signals with a frequency band of 0-80...

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Abstract

The invention provides a decoding method of an audio signal. The encoding method includes the following steps: when the audio signal corresponding to the received coding stream switched from the relatively wide bandwidth to the relatively narrow bandwidth, low band signal component of the audio signal is obtained and high band information is extended; the time-varying fade-out treatment is carried out to extended high band information to obtain processed high band information component; the processed high band information component and the low band signal component are combined. By the method provided by the embodiment of the invention, when the audio signal switches from the wide band to narrow band, a series of treatments, such as bandwidth detection, manual band spreading, time-varying fade-out treatment and bandwidth combination are available to realize smoothing switch from a wide band signal to a narrow band signal, thus achieving a more comfortable auditory feeling of human ears.

Description

technical field [0001] The present invention relates to the field of voice communication, in particular to an audio decoding method and device. Background technique [0002] G.729.1 is the new generation of voice codec standard released by ITU (International Telecommunication Union, International Telecommunication Union). / s ~ 32kb / s narrowband to broadband audio quality, allowing the outer code stream to be discarded according to the channel conditions during the transmission process, and has good channel adaptability. [0003] In the G.729.1 standard, the hierarchy is achieved by constructing the code stream into an embedded layered structure, which is a new type of embedded layered multi-rate speech codec. The input is a superframe of 20ms, when the sampling rate is 16000Hz, the frame length is 320 points. figure 1 It is a block diagram of the encoder system of each layer of G.729.1, and the specific process of speech codec encoding is as follows: input signal s WB (n)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/12G10L19/14H04L1/00G10L19/16
Inventor 陈喆殷福亮张小羽代金良张立斌
Owner HUAWEI TECH CO LTD
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