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Communication device and communication method

The technology of a communication device and a communication method is applied in the direction of telephone communication, multiplex communication, error prevention/detection using a return channel, etc., and can solve the problems of wireless communication without voice, without considering the characteristics of voice coding, etc., and achieve effective voice The effect of communication

Inactive Publication Date: 2007-03-28
KYOCERA CORP
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Problems solved by technology

[0004] However, in the above-mentioned prior art, the characteristics of speech coding such as voiced intervals and unvoiced intervals in the encoded speech information are not considered, and speech wireless communication is not effectively performed.

Method used

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  • Communication device and communication method
  • Communication device and communication method
  • Communication device and communication method

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Embodiment Construction

[0020] FIG. 1 is a diagram showing the configuration of a communication system using a communication device according to the present invention.

[0021] The communication system of FIG. 1 is a PHS (Personal Handphone System) communication system, and consists of a base station device 100, a terminal 200 as a communication device according to the present invention, and a wireless communication system that communicates between these base station devices 100 and the terminal 200. Communication path 300 is used to form. In addition, in FIG. 1 , only one terminal 200 is shown, but the base station apparatus 100 can communicate with a plurality of terminals 200 .

[0022] The base station device 100 has a bottom layer processing unit 101 , an error detection unit 102 , a speech coding parameter storage register 103 , a voiced / unvoiced judging unit 104 , a retransmission request judging unit 105 , an error frame processing unit 106 and a speech decoding unit 107 . On the other hand,...

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Abstract

A communication device and method is provided which enables effective voice communications. An error detection unit ( 102 ) within a base station device ( 100 ) detects transmission line errors of an encoded voice frame data from a terminal ( 200 ). A voiced-or-unvoiced discrimination unit ( 104 ) determines whether or not the encoded voice frame data corresponds to the voiced section. If a transmission error is contained in the encoded voice frame data and the encoded voice frame data corresponds to the voiced section, a retransmission request discrimination unit ( 105 ) causes the terminal ( 200 ), within the 20 ms frame time corresponding to the encoded voice frame data, to return NAK as a retransmission request and retransmit the encoded voice frame data, using forward communication time slots in a retransmission 5-ms frame.

Description

technical field [0001] The present invention relates to a communication device and a communication method for decoding received coded audio information in units of frames. Background technique [0002] In wireless communication, speech is widely encoded and transmitted. For example, in G.729 and G.723 recommended by ITU-T adopted as a speech coding method in VoIP (Voice over Internet Protocol), speech coding is performed at a cycle of 20 ms or 40 ms. [0003] In such voice wireless communication systems, the occurrence of transmission errors has a great influence on poor voice quality. Therefore, for example, Japanese Unexamined Patent Publication No. 10-62998 discloses that when a transmission error occurs in a wireless communication device that decodes coded speech information in units of frames, error frame processing prescribed by the speech coding method is performed. , and the time variation of the bit error rate is added and reflected in the error frame processing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/18H04J3/00H04L1/16H04L12/70H04M11/06
CPCG10L19/005G10L25/93G10L25/78
Inventor 柏濑荐
Owner KYOCERA CORP
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