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Speech code data conversion system and method from HELP code to MELP (Mixed Excitation Linear Prediction) code

A technology of speech coding and conversion method, which is applied in the field of speech coding data conversion system, which can solve the problems of large amount of computation and increased speech distortion, and achieve small conversion computation, save running time, and avoid multiple transfer distortions Effect

Inactive Publication Date: 2012-04-18
CHONGQING UNIV
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Problems solved by technology

This traditional code stream conversion scheme has disadvantages such as a large amount of calculation and increased voice distortion after secondary compression and decompression.

Method used

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  • Speech code data conversion system and method from HELP code to MELP (Mixed Excitation Linear Prediction) code
  • Speech code data conversion system and method from HELP code to MELP (Mixed Excitation Linear Prediction) code
  • Speech code data conversion system and method from HELP code to MELP (Mixed Excitation Linear Prediction) code

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Embodiment Construction

[0064] Preferred embodiments of the present invention will be described in detail below.

[0065] The present invention converts the LSF parameters of the HELP speech coding scheme, pitch period, voicing degree, power, and the inverse quantization value of the spectral shape into the LSF parameter of the MELP speech coding scheme, pitch period, subband sound intensity, aperiodic sign and Fourier Leaf series magnitude values, create a target signal from the reproduced speech and pitch synthesis signal, and obtain an algebraic encoding of the target signal.

[0066] see figure 2 , a voice coded data conversion system from HELP coding to MELP coding, including

[0067] The error correction module receives the HELP coded voice data stream, and performs error detection and error correction processing on it;

[0068] The coding component separation module separates the coding components needed to reconstruct the speech from the HELP coded speech data stream after error correction...

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Abstract

The invention particularly relates to speech code data conversion system and method from an HELP code to an MELP (Mixed Excitation Linear Prediction) code, relating to the technical field of speech code conversion. The speech code data conversion system from the HELP code to the MELP (Mixed Excitation Linear Prediction) code comprises an error correction module, a code component separation module, a code inverse quantization module, a code conversion module, a quantization code module and a code multiplex module. The speech code data conversion method comprises the following steps of: carrying out error detection and correction processing on speech data streams of HELP codes; separating code components needed by refactoring speech, and carrying out inverse quantization; then respectively converting and quantizing the code components; and finally framing according to an MELP speech code algorithm standard to form the speech data streams of MELP codes. Compared with the prior art, the invention has small operation amount and low distortion degree.

Description

technical field [0001] The invention relates to the technical field of speech coding conversion, in particular to a speech coding data conversion system and method from HELP coding to MELP coding. Background technique [0002] Speech coding technology refers to the process of compressing and decompressing speech signals. Using digital technology to store and transmit voice has been widely used in various communication systems. The digital transmission of speech signals exists in a variety of speech coding technologies. The purpose of each speech coding technology is to provide more convenient storage and transmission or to reduce the transmission rate as much as possible for specific applications, and to ensure a certain voice quality. The currently popular speech coders all use their own specific speech coding algorithm standards, and the two speech coder algorithms are as follows: [0003] 1. HELP (Harnonic Excited Linear Prediction): The encoding rate is 2.4k / s. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/14G10L19/02G10L19/04G10L19/16
Inventor 吴玉成陈峰
Owner CHONGQING UNIV
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