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Multichannel interconnected vocoder and its realizing method

An implementation method and technology of a vocoder, applied in the field of communication, can solve the problems of difficulty in modification, poor flexibility, and high cost, and achieve the effect of stable algorithm program performance, simple control, and good stability

Inactive Publication Date: 2005-01-26
XIAN DATANG TELECOM
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Problems solved by technology

Based on FPGA / ASIC, it belongs to a circuit hardware implementation method, which has high cost and poor flexibility. It is difficult to modify after finalization, which is not conducive to algorithm upgrade, control and maintenance.
The CPU-based method generally uses a dedicated digital signal processing chip (DSP). Due to the limitations of its processing speed and data throughput, the general-purpose CPU is not suitable for intensive mathematical operations and cannot meet the requirements of large-scale real-time applications.

Method used

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  • Multichannel interconnected vocoder and its realizing method
  • Multichannel interconnected vocoder and its realizing method
  • Multichannel interconnected vocoder and its realizing method

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Embodiment Construction

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and the embodiments specifically completed by the inventor.

[0047] According to the technical scheme of the present invention, the inventor has provided a kind of multi-channel G729ab and G723.1 joint vocoder developed based on TMS320C6000 series special digital signal processor (Digital Signal Processor, DSP for short) of the present invention and Its implementation method.

[0048] 5.1 Implementation method of multi-channel G.729ab and G.723.1 joint vocoder

[0049] Firstly, the implementation method of the core algorithm of the single-channel G.729ab codec and the core algorithm of the G.723.1 codec is explained.

[0050] The frame length of the G.729ab encoder is 10ms, the processing delay is 10ms, plus the look-ahead of 5ms, the algorithm delay is 25ms in total; the encoded data rate is 8kbps; the user can set VAD on or off as required.

[0051] The fra...

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Abstract

A multichannel joint vocoder includes a hardware platform for real time voice coding and decoding process and software for the joint vocoder, and the joint vocoder adopts a software structure such that all status variables required by operating each channel are put up, including status variable definition required by carrying on G 729 ab and G 723.1 coding and decoding algorithm as well as channel control parameter into one structure and to distribute an independent and permanent internal memory space for it with each channel to correspond to a complete status structure definition so as to ensure each channel to dispose and adjust the working mode flexibly, the hardware platform uses the special-purpose DSP chip of TMS320C6203 with the software applying method of mixing programming of C language.

Description

1. Technical field [0001] The invention belongs to the technical field of communication, relates to a vocoder, in particular to a method for realizing a multi-channel joint vocoder. 2. Background technology [0002] With the integration of traditional circuit-switching network and packet-switching network (that is, data network), the voice compression coding technology for VoIP (Voice over Internet Protocol) has more and more extensive application requirements. Voice compression coding is one of the key technologies in VoIP media gateway (Media Gateway) equipment. ITU-T has released a series of voice compression codec standards for VoIP, including 8kbps rate G.729ab codec and 6.3 The G.723.1 codec with kbps rate and 5.3kbps rate is the two most widely used voice compression codecs. These two encoding algorithms can realize long-distance quality voice low-rate encoding, and the encoded voice bandwidth is reduced. In this way, the bandwidth multiplexing of multi-channel voice...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/30H04L12/66H04L29/06
Inventor 廖延娜陈新富孙健张正阳
Owner XIAN DATANG TELECOM
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