Digital colony communication system and coding/decoding method thereof

Abstract

This invention relates to one digital group communication system and its decode method, which comprises the following steps: setting one according relative business channel by group communication system to make the communication sound send center adopt TFO transfer ad direct send; then using TRAU unit to store TRAU frame or TFO transfer function, single sound input and output transparent transferring function and sound transfer device inputs to channel.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to digital trunking communication technology. Background technique [0002] Trunking communication can be specially provided to medical institutions, public security, transportation, railways and other departments for situations where there is difficulty in communication due to the instability of temporary allocation of personnel under emergency reasons. The voice environment created by the trunking dispatching service can be used in In a short period of time, all the content to be conveyed through large-scale gatherings such as personnel scheduling, convening, collaborative case solving, and engineering command can be completed. [0003] The trunking scheduling completed in cooperation with the telecom operator is the high-level development direction of traditional mobile communication services. Through the system operation under the coverage of the public communication switch...

AI Technical Summary

Problems solved by technology

[0017] The existing trunking communication system has the disadvantages of poor voice quality, low transmission efficiency, and failure to meet business needs

And although the existing GSM system has realized the de-secondary speech codec function of the point-to-point call, it has not realized the TFO function of the group call (group call or multicast)

Since the GSM system does not support TFO for trunking calls, for group calls or multicasts, the end-to-end voice needs to go through two voice codecs. Since the voice codec is a codec technology that depends on the characteristics of the source, it is an irreversible process. During the coding process, the source information will be lost, and the secondary codec will lead to the loss of additional voice information and reduce the voice quality; this is even more difficult to guarantee the voice quality of the trunking communication system for a large-area trunking communication system

[0018] In practical applications, there are the following problems: trunking communication system services often have poor voice quality, low transmission efficiency, and prolonged

[0019] The main reason for this situation is that in the group call and multicast trunking communication of the existing GSM system, the uplink voice data must be encoded into the same format at the voice distribution point, and then sent to each receiver for decoding. Secondary codec, resulting in serious loss of voice quality, lower transmission efficiency, and enhanced processing delay

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