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Digital radio communication system with efficient audio and non-audio data transmission

  • US 5,757,788 A
  • Filed: 01/11/1996
  • Issued: 05/26/1998
  • Est. Priority Date: 01/11/1996
  • Status: Expired due to Fees
First Claim
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1. A radio communication system for transmitting audio data and non-audio data between a transmitter personal station and a receiver personal station, the audio data and the non-audio data being transmitted on time slots which have been time-division multiplexed, each of the transmitter personal station and the receiver personal station comprising:

  • a transmission/reception means for transmitting and receiving the time slots to and from other personal station, each of the time slots including a data field in which one of the audio data and the non-audio data are written, a control field in which control information is written, and an identifier field in which one of a first identifier for the audio data and a second identifier for the non-audio data is written;

    an audio data conversion means provided with a microphone for receiving speech through the microphone and converting the speech into audio data;

    a non-audio data holding means provided with an input terminal connected with an output terminal of a data processor, said non-audio data holding means receiving non-audio data from the data processor, and holding the non-audio data received;

    an audio data amount detection means for detecting whether an amount of audio data to be produced per unit time by said audio data conversion means is lower or higher than a predetermined threshold;

    a write means for, when the amount of the audio data has been detected to be lower than the threshold, fetching a predetermined amount of non-audio data from said non-audio data holding means, writing the non-audio data fetched to the data field of a first time slot, further writing the second identifier to the identifier field of the first time slot, and making said transmission/reception means transmit the first time slot to the other personal station, and when the amount of the audio data has been determined to be higher than the threshold, writing the audio data produced in said audio data conversion means to the data field of a second time slot, further writing the first identifier to the identifier field of the second time slot, and making said transmission/reception means transmit the second time slot to the other personal station;

    a speech restoration means provided with a speaker for restoring speech from audio data;

    an identifier detection means for detecting whether the identifier field of a third time slot that said transmission/reception means has received from the other personal station has the first identifier or the second identifier; and

    a distribution means provided with an output terminal connected with an input terminal of the data processor for, when said identifier detection means has detected that the identifier field of the third time slot has the first identifier, fetching audio data from the data field of the third time slot, and outputting the audio data fetched to said speech restoration means, and when said identifier detection means has detected that the identifier field of the third time slot has the second identifier, fetching non-audio data from the data field of the third time slot, and outputting the non-audio data fetched to the data processor.

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