Anti-channel error code protection method for 1.2kb/s SELP low-speed sound coder

A vocoder and low-rate technology, applied in instruments, speech analysis, speech synthesis, etc., can solve the problems of full-voiced sound frame parameters without protection scheme, increase of residual bit error rate, and affect the quality of synthesized speech, so as to improve the anti- Effect of channel error capability and synthesized speech quality, high intelligibility and comfort

Inactive Publication Date: 2007-08-01
TSINGHUA UNIV
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Problems solved by technology

Since the Hamming code can only correct one bit error, in the case of a high bit error rate, the residual bit error rate will increase significantly, and there is no protection scheme for the parameters of the fully voiced frame
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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  • Anti-channel error code protection method for 1.2kb/s SELP low-speed sound coder
  • Anti-channel error code protection method for 1.2kb/s SELP low-speed sound coder
  • Anti-channel error code protection method for 1.2kb/s SELP low-speed sound coder

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Embodiment Construction

[0020] The 1.2kb / s SELP low-rate vocoder anti-channel error code protection method proposed by the present invention is further described as follows in conjunction with accompanying drawings and embodiments:

[0021] Method of the present invention is realized by following steps successively in digital integrated circuit chip, as shown in Figure 1, at encoder end::

[0022] (1) The unvoiced sound parameter BPVC output by the 1.2kb / s SELP vocoder judges the state of the unvoiced sound, and the unvoiced sound parameters are rearranged according to the weight of the encoding end 16:8:4:2:1 to enhance the mode-based situation of the vocoder Under the anti-error performance; at the same time, the lowest position of the residual spectrum amplitude is set to 0 for unvoiced frames, and set to 1 for voiced frames;

[0023] (2) unvoiced frame adopts BCH (15, 7) code group to protect the first-level line spectrum pair parameter high 7 bits, and check digit is written in the margin spectr...

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Abstract

This invention relates to low speed rate sound anti-error coding technique, which is characterized by the following steps: re-aligning weight and labeling distance on blur parameters on coding on edit end; adopting two sets of BCH codes and odd and even test to protect blur sound and its parameters; on decode end according to signal channel property by use of branch to determine blur sound by use of maximum test possibility; for clear sound by use of BCH codes to restore relative parameters to decode out spectrum to restore anti-error code formula.

Description

technical field [0001] The invention belongs to the technical field of speech coding, in particular to the speech coding anti-channel error technology. Background technique [0002] Low-rate voice coding with a rate of 1.2kb / s is widely used in wireless communication, secure communication, voice storage playback system, and consumer products with voice function. However, in the environment of narrow-band wireless channel with high bit error rate and relatively harsh conditions, such as: outdoor wireless channel, shortwave ultrashort wave communication, secure communication, etc., channel bit error has a great impact 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 do not allow additional bandwidth consumption and large codec delay, which is in contradiction with tradition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/14G10L19/12G10L13/00G10L11/06G10L21/02G10L19/07G10L19/16G10L25/93
Inventor 唐昆崔慧娟彭坦龚晨李晔洪侃
Owner TSINGHUA UNIV
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