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Wideband acoustic encoder and method

A speech coder and coder technology, which is applied in the field of wideband extension of speech coding, can solve problems such as high complexity, high delay, and low audio quality, and achieve the effect of low complexity, low delay, and high coding efficiency

Inactive Publication Date: 2009-07-22
ZTE CORP
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Problems solved by technology

However, existing wideband speech coding methods have disadvantages such as high delay and high complexity, while narrowband vocoders have lower audio quality due to narrow bandwidth

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  • Wideband acoustic encoder and method

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Embodiment Construction

[0038] Such as figure 1 As shown, a wideband speech encoder 100 provided by the present invention includes: a preprocessing module 101, a frequency dividing module 102, a low-band encoder 103, a low-band decoder 104, a differential operation module 105, and a low-band enhanced encoder 106 , High-band enhanced encoder 107 and code stream multiplexing module 108, where:

[0039] The preprocessing module 101 is connected to the frequency dividing module 102, and is used to preprocess the sampled input broadband digital voice signal, and filter out the signal offset and the low frequency signal component of 0-50Hz;

[0040] The frequency dividing module 102 is respectively connected with the low-band encoder 103 and the high-band enhanced encoder 107, and is used to extract the high-frequency component and low-frequency component of the pre-processed wideband digital voice signal to obtain high and low sub-band signals Respectively output to the high-band enhanced encoder 107 and the...

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Abstract

A wideband speech coder is provided, wherein a frequency division module extracts high and low frequency components from wideband digital speech signals and gets high and low sub-band signals to output the signals thereof; a low band coder codes a low sub-band signal into a low band code stream data and outputs the data; a low band decoder decodes the low band code stream data into low sub-band speech signals and outputs the signals; a difference operation module leads the original low sub-band signal to subtract the low sub-band speech signal to obtain low sub-band differential signals and outputs the signals; a low band enhanced coder codes low sub-band differential signals into low band enhanced code stream data and outputs the data; a high band enhanced coder codes high sub-band signals into high band enhanced code stream data and outputs the data; a code stream multiplexing module processes the low band code stream data, the low band enhanced code stream data and the high band enhanced code stream data into the wideband speech code stream data by multiplexing and packaging and outputs the data. The wideband speech coder has the characteristics of applicability to the wideband speech by expanding the bandwidth of voice coders, low delay and low complexity.

Description

Technical field [0001] The present invention relates to wideband speech coding technology, in particular to wideband extension technology for speech coding. Background technique [0002] Today's telecommunications networks have generally used optical fiber transmission, and the original PSTN network has gradually been replaced by IP-based networks, and the application conditions for broadband voice have gradually matured. However, the existing wideband speech coding methods have shortcomings such as high delay and high complexity, and narrowband vocoders have lower audio quality due to their narrow bandwidth. Therefore, the narrowband vocoder needs to be wide-band extended, and at the same time, the speech coding method can maintain a low delay and computational complexity. Summary of the invention [0003] The technical problem to be solved by the present invention is to provide a wideband speech coder and method, which can make the speech coder have the characteristics of low ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00H03H17/02G10L19/02G10L19/20
Inventor 钟毅睿高毅
Owner ZTE CORP
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