Press-talk server, transcoder, and communication system

Details Press-talk server, transcoder, and communication system Press-talk server, transcoder, and communication system

2011-08-02

2011-08-02

West, Lewis G (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

C455S517000, C455S519000, C455S403000, C455S404100, C455S090200, C719S328000, C370S227000

Reexamination Certificate

active

07991419

ABSTRACT:
When half-duplex many-to-many communication is performed among a plurality of mobile stations having different codecs in a single group, transcoding is performed with a small number of codec circuits. A transcoder manages an SSRC of a received RTP packet, detaches voice information from a jitter buffer, which is identical to a latest SSRC, and inputs the detached voice information to a codec circuit. As the latest SSRC is switched, a voice sending station subject to transcode is switched, and mobile stations using the same codec share the codec circuit. Therefore, in a half-duplex many-to-many communication (group communication) system, called a professional mobile radio system, push-talk, or press-talk, it is not necessary to switch the transcoder until a radio station which takes a talk burst is changed during a single call (call session).

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