MELP/CELP mixed voice encoding communication system based on steel rails and encoding method

A technology of mixed coding and mixed voice, which is applied in the field of MELP/CELP mixed voice coding communication system, which can solve the problems of voice restoration error at the receiving end, difficulty in meeting emergency communication, time phase asynchronous, etc., to reduce attenuation and distortion, and improve voice Encoding efficiency, quality improvement effect

Inactive Publication Date: 2019-11-26
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main problems are: (1) The time phase of the rail channel transmitter and receiver is not synchronized, resulting in errors in voice restoration at the receiver; (2) The rail communication channel itself has a small channel capacity, and the number of speech coded signals transmitted at one time is difficult to meet The needs of emergency communication; (3) Due to the channel medium and long transmission distance, the voice signal attenuation is large, and there will be frame drop and loss

Method used

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  • MELP/CELP mixed voice encoding communication system based on steel rails and encoding method
  • MELP/CELP mixed voice encoding communication system based on steel rails and encoding method
  • MELP/CELP mixed voice encoding communication system based on steel rails and encoding method

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Embodiment 1

[0037] Embodiment 1: see Figure 1 to Figure 3 , a rail-based MELP / CELP hybrid speech coding communication system, including MELP / CELP hybrid encoder and MELP / CELP hybrid decoder, MELP / CELP hybrid encoder and MELP / CELP hybrid decoder are also sequentially equipped with 2FSK modulation Transducer, first transducer, rail channel, second transducer and 2FSK demodulator;

[0038] The MELP / CELP hybrid coder is used to divide the original speech signal into speech frames, classify the speech frames by strongly voiced, weakly voiced and unvoiced, and carry out MELP / CELP hybrid coding with the speech frame to form a hybrid coded speech frame;

[0039] The MELP / CELP hybrid decoder is used to decode and synthesize and filter the received mixed coded speech frame, and output a synthesized speech signal;

[0040] The 2FSK modulator is used for signal modulation of the mixed coded speech frame to form an analog electrical signal;

[0041] The 2FSK demodulator is used to demodulate the an...

Embodiment 2

[0056] Example 2: see Figure 1 to Figure 3 , in order to better illustrate the solution of the present invention, on the basis of Embodiment 1, we divide the rail-based MELP / CELP hybrid speech coding communication system into a sending end, a transmission medium, and a receiving end.

[0057] The sending end includes: MELP / CELP hybrid encoder, 2FSK modulator, first transducer;

[0058] The transmission medium is: steel rail channel;

[0059] The receiving end includes: a second transducer, a 2FSK demodulator, and a MELP / CELP hybrid decoder.

[0060] The working process of the present invention is as follows: the original voice signal first enters the sending end, after the voice frame is classified by the MELP / CELP hybrid encoder, a mixed coded voice frame is formed and output, and then the mixed coded voice is output through the 2FSK modulator and the first transducer The frame is loaded on the rail channel for transmission in the form of high-frequency mechanical vibratio...

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Abstract

The invention discloses an MELP/CELP mixed voice encoding communication system based on steel rails and an encoding method. The MELP/CELP mixed encoding and decoding and steel rail signal channels arecombined; a low-speed mixed voice encoding scheme is applied to a steel rail voice communication system; and the problems of the system of asynchronous time phases of a sending end and a receiving end, small volume of the steel rail communication signal channel and great transmission attenuation of voice signals in the steel rail signal channel are solved. By aiming at the three major technical problems, the method has the technical scheme that a time phase alignment algorithm is added to conventional MELP encoding; MELP voice encoding frames are properly reduced; high-frequency carrier wavesare generated by a 2FSK modulator; and high-frequency mechanical vibration carrier waves are generated by using an energy converter. The system and the method provided by the invention have the advantages that the steel rail voice signal encoding and decoding efficiency can be enhanced; the signal channel volume of the steel rail signal channel is improved; the stability of the steel rail voice communication system is improved; and the voice communication quality of the steel rail communication system is enhanced.

Description

technical field [0001] The present invention relates to a communication system and method, in particular to a rail-based MELP / CELP hybrid voice coding communication system and coding method. Background technique [0002] The rail communication system uses the rails in the closed space formed by some disasters as a communication channel to realize emergency communication after the disaster. Apply the MELP / CELP low-rate hybrid speech coding scheme to rail voice communication, and invent a rail-based MELP / CELP low-rate hybrid speech coding communication system, which can effectively reduce speech coding time, improve speech coding efficiency, and ensure rail speech transmission quality. [0003] However, due to the instability of the surrounding environment of the rail channel and the particularity of the rail channel, some practical application problems will arise after the MELP / CELP low-rate hybrid speech coding scheme is applied to the rail communication system. [0004] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/20
CPCG10L19/20
Inventor 钟晓玲李家龙阴明娄皓翔江勇
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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