Coding method and decoding method for ultra wide band expansion, coder and decoder as well as system for ultra wide band expansion

An extended coding and ultra-wideband technology, which is applied in the field of voice communication, can solve the problems that the audio quality cannot be greatly improved, the coding effect of the music-like signal is poor, and the music signal cannot be accurately described, so as to improve the audio quality and enrich the signal content effect

Active Publication Date: 2009-09-09
江苏三晟信息科技有限公司
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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: the prior art extends the narrowband speech signal from 0 to 3.4kHz to 0 to 7kHz, and only completes the frequency band extension of less than 4kHz, and the decoded The voice signal lacks ultra-wideband signals abov

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  • Coding method and decoding method for ultra wide band expansion, coder and decoder as well as system for ultra wide band expansion
  • Coding method and decoding method for ultra wide band expansion, coder and decoder as well as system for ultra wide band expansion
  • Coding method and decoding method for ultra wide band expansion, coder and decoder as well as system for ultra wide band expansion

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Embodiment Construction

[0064] The following embodiments of the present invention are based on the correlation between low frequency and high frequency signals to realize ultra-wideband extension; wherein, existing speech codec standards can be used during speech codec, and the following embodiments are all coded in G.729.1 The decoding standard is taken as an example for description.

[0065] figure 2 It is a flow chart of an embodiment of the ultra-wideband extension coding method of the present invention, specifically including:

[0066] Step 101, the input ultra-wideband voice signal such as s of 0~16kHz SWB (n) split into high-frequency sub-band signal s H QMF (n) and low-frequency sub-band signal s L QMF (n). Among them, the input signal s SWB (n) is an ultra-wideband signal with a sampling rate of 32kHz. After QMF analysis filtering and ↓2 sampling, it is divided into low-band and high-band channels, and the low-frequency sub-band signal s with a sampling rate of 16kHz is output respec...

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Abstract

The invention relates to a coding method and a decoding method for ultra wide band expansion, a coder and a decoder as well as a system for the ultra wide band expansion, wherein the coding method and the coder obtain a coding parameter of a reconstructed 7-8 kHz signal through wide band enhancement, perform perception weighting on the base, obtain a frequency band expansion parameter of a reconstructed 8-14 kHz high frequency signal according to a principle of the smallest mean square error; and a decoding end reconstructs a 7-14 kHz high frequency signal through coding transmission so as to achieve the expansion of a 7-14 kHz ultra wide band. The decoding method and the decoder decode a residual error MDCT coding parameter to obtain a 7-8 kHz residual error MDCT recovery coefficient, perform perception weighting on the base, and reconstruct a 8-14 kHz signal according to the principle of the smallest mean square error so as to achieve the reconstruction of the 7-14 kHz high frequency signal and obtain a 0-14 kHz ultra wide band signal.

Description

technical field [0001] The invention relates to voice communication technology, in particular to an ultra-wideband extension encoding and decoding method, a codec and an ultra-wideband extension system. Background technique [0002] In real-time voice communication, because the transmission quality of voice signals is affected by factors such as sampling rate and bandwidth, existing voice and audio codecs usually use methods such as reducing the sampling rate and losing high-frequency content to ensure the codec process. realization. This is especially true for the transmission of wideband voice signals (50Hz ~ 7kHz). In order to avoid aliasing effects, the wideband signal is usually converted into a band-limited signal and then encoded. In this way, when the code rate is determined, especially for Medium and low bit rates, ensuring enough bits to encode low-frequency content. However, the high-frequency part of the broadband signal contains rich content, and the lack of t...

Claims

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Application Information

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IPC IPC(8): G10L19/00G10L19/02G10L21/04G10L19/24G10L21/02G10L21/038
CPCG10L19/24G10L21/038
Inventor 肖玮刘泽新马付伟吴文海王庭红
Owner 江苏三晟信息科技有限公司
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