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Dual mode satellite/cellular terminal

  • US 5,729,538 A
  • Filed: 03/11/1997
  • Issued: 03/17/1998
  • Est. Priority Date: 07/12/1995
  • Status: Expired due to Term
First Claim
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1. A communications system for relaying digitally coded voice signals to each of a plurality of remote stations, comprising:

  • voice coding means for digitizing and coding voice signals to produce frames of digital data containing a fixed number of bits representing a segment of the voice signal over a time period and producing an associated voice/no voice flag;

    error correction coding means for coding each of said voice frames to produce a first coded symbol block and a second coded symbol block each representing a respective one of said speech frames;

    TDMA burst transmission means for relaying said first coded symbol blocks to respectively intended remote stations using an allocated timeslot in a repetitive TDMA frame period; and

    control means for controlling said burst transmission means to replace a first coded symbol block when said associated flag indicates the no-voice condition by a second coded symbol block intended for a different remote station.

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