Protection method for anti channel error code of voice coder in 2.4kb/s SELP low speed

A vocoder, low-rate technology, used in instruments, speech analysis, speech synthesis, etc., can solve the problems affecting the quality of synthesized speech and increase the residual bit error rate, so as to improve the ability to resist channel errors and the quality of synthesized speech, The effect of high intelligibility and comfort

Inactive Publication Date: 2007-07-25
TSINGHUA UNIV
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Problems solved by technology

Since only one bit error can be corrected by using Hamming code, the remaining bit error rate will increase significantly in the case of high bit error rate
And when an error occurs, only the parameters of the previous frame are used to directly replace the parameters of this frame, which affects the quality of synthesized voice when there is a channel error

Method used

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  • Protection method for anti channel error code of voice coder in 2.4kb/s SELP low speed
  • Protection method for anti channel error code of voice coder in 2.4kb/s SELP low speed
  • Protection method for anti channel error code of voice coder in 2.4kb/s SELP low speed

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Embodiment Construction

[0023] The unvoiced frame protection method of the 2.4 kb / s SELP low-rate vocoder proposed by the present invention is further described as follows in conjunction with accompanying drawings and embodiments:

[0024] Method of the present invention realizes by following steps successively in digital integrated circuit chip, as shown in Figure 1, at coder end:: (1) the voiceless sound parameter (BPVC) lowest bit of 2.4kb / s SELP vocoder output To judge whether it is unvoiced or not, change the unvoiced and voiced parameters of the unvoiced frame from 00000 mode to 00101 mode to send;

[0025] (2) Use the BCH (15, 7) code group to protect the first-level line spectrum pair parameters, a total of 7 bits, and write the check digit to the upper 8 bits of the residual spectrum amplitude parameter; use the BCH (31, 16) code group Protect the second and third-level line spectrum pair parameters and the lower 4 bits of the gain parameter, a total of 16 bits, and write the check digit to ...

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Abstract

A method for protecting channel error code resistance ability of low speed vocoder includes applying improved Chinese plain code and BCH code to separately protect voice parameter in voiceless and voiced sound frames at coding end, using BCH code to recover relevant parameters of voiceless sound frame and using maximum post verification probability rule to recover parameter of voiceless sound accurately for voiced sound frame then using line spectrum to parameter anti-error code algorithm to recover line spectrum to parameter at decoding end.

Description

technical field [0001] The invention belongs to the technical field of speech coding, in particular to speech coding anti-channel error technology Background technique [0002] Low-rate voice coding with a rate of 2.4kb / s is widely used in wireless communication, secure communication, voice storage playback system, and consumer products with voice function. Due to the low-rate speech coding, the amount of information carried by each speech parameter increases. In the environment of harsh or harsh conditions and high bit error rate narrowband wireless channel environments, such as: outdoor wireless channels, shortwave and ultrashortwave communications, and secure communications, the channel Bit errors have a great influence on the reconstructed voice quality. The intelligibility, naturalness and comfort of speech reconstructed by the low-rate vocoder affected by the high bit error rate will be greatly reduced. However, the special requirements of low-rate voice transmission...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/14G10L19/12G10L13/00G10L11/06G10L21/02G10L19/038G10L19/18
Inventor 唐昆崔慧娟彭坦龚晨李晔洪侃
Owner TSINGHUA UNIV
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