Digital interphone with adaptive vocoder

A technology of vocoder and encoder, which is applied in the field of digital walkie-talkies, can solve the problems of large flexibility in fusion methods, and achieve the effects of large flexibility, clear voice, and good voice and audio quality

Inactive Publication Date: 2012-07-25
TIANJIN 712 COMM & BROADCASTING CO LTD
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  • Abstract
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Problems solved by technology

[0007] At present, the design schemes of different manufacturers have different technical characteristics. A baseband processing chip that can be plugged with multiple Vocoders is designed. The digital walkie-talkie composed of such baseband processing chips can give full play to the encoding and decoding of each Vocoder. The advantage of this integration method is that it is flexible, and the baseband processing chip can be implemented by plugging in multiple Vocoder digital walkie-talkies. At present, there is no such technology product in the market, and there is no such technology report in the literature. Therefore, its development a lot of space

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  • Digital interphone with adaptive vocoder

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Embodiment Construction

[0024] Describe the present invention in detail below in conjunction with accompanying drawing:

[0025] Such as Figure 1 to Figure 6 As shown, the vocoder chip module is composed of two vocoder chips, AMBE and SELP of Tsinghua University. The present invention is a digital walkie-talkie using an adaptive vocoder algorithm.

[0026] The vocoder (vocoder) contains independent encoder and decoder. The encoder receives an 8kHz sample stream of speech data (16-bit linear, 8-bit A-law or 8-bit U-law) and outputs a channel stream at the desired baud rate. Conversely, the decoder takes a channel data stream and synthesizes a speech data stream, such as figure 1 shown.

[0027] The channel interface is used to describe the compressed bit stream output from the encoder and the compressed bit stream input to the decoder. The interface can also output status information, for example, it can detect whether there is a dual-tone multi-frequency (DTMF) voice signal input. Additionally,...

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Abstract

The invention relates to a digital interphone with an adaptive vocoder. A main circuit comprises a control unit, a digital base band processing chip, a codec chip, a vocoder chip module and a radiofrequency front-end circuit, the control unit is respectively connected with the radiofrequency front-end circuit and the digital base band processing chip, the codec chip is respectively connected with the radiofrequency front-end circuit and the digital base band processing chip, and the vocoder chip module is connected with the digital base band processing chip, and consists of an AMBE (advanced multi-band excitation) vocoder chip and an SELP (sinusoidal excitation linear prediction) vocoder of the Tsinghua University which are integrated. The digital interphone with the vocoder chip module can sufficiently play the advantages of the various vocoders to the codec, better speech and voice quality can be realized in a signal environment with a wider range, audio noise received by the digital interphone is little, voice is clearer, and various European and Asian market needs can be met by the aid of high flexibility of a combination mode of the digital interphone.

Description

technical field [0001] The invention relates to a digital walkie-talkie, in particular to a digital walkie-talkie using an adaptive vocoder. Background technique [0002] A digital walkie-talkie is a walkie-talkie designed with digital technology. The digital walkie-talkie digitizes the voice signal and transmits it in the form of digital code, that is to say, all the modulations on the transmission frequency of the walkie-talkie are digital. Compared with analog walkie-talkies, digital walkie-talkies have improved voice quality. Because digital communication technology has an error correction function in the system, compared with analog walkie-talkies, it can achieve better voice and audio quality in a wider range of signal environments. The received Audio noise will be less and the sound will be clearer. [0003] Generally speaking, a digital walkie-talkie contains a baseband processing chip, a codec chip, a vocoder chip, and a radio frequency circuit. The baseband proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/16
Inventor 张财元黄振华李辉辉张键王伟刘武超康保亮
Owner TIANJIN 712 COMM & BROADCASTING CO LTD
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