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Digital radio telephone system

  • US 5,260,941 A
  • Filed: 05/29/1992
  • Issued: 11/09/1993
  • Est. Priority Date: 10/31/1990
  • Status: Expired due to Fees
First Claim
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1. A telephone key system to operate a plurality of radio handsets, said system connecting to an external telephone system for telephonic communications with telephone systems and users external to the telephone key system, said telephone key system operating at predetermine frame rate at which voice is transmitted to the external telephone system, said telephone key system comprising:

  • a central control unit (CCU) comprising;

    an external telephone interface which connects to the external telephone system;

    at least one radio frequency (RF) interface comprising at least one radio transceiver to transmit voice and command data between the radio handsets and the CCU;

    a time slice bus which interconnects devices connected to the bus comprising the external telephone interface and RF interface to provide the transfer of voice data between devices and the transmission of voice data between the external telephone system and the handsets,bus controlling means for controlling the operation of the bus, said bus controlling means comprising,a clock means for dividing the frame into a plurality of slots whereby a unit of voice data can be transferred between a source device which outputs voice data onto the bus during a slot and a destination device, which receives voice data output onto the bus during a slot;

    source and destination device identification means for identifying the source and destination devices for each time slot used; and

    bus processing means for reading the identification of source and destination devices for each time slot and enabling the corresponding source and destination devices such that the source device puts data onto the bus and the destination device latches the data from the bus during the corresponding time slot;

    wherein the bus controlling means controls the operation of the time slice bus of the CCU such that the radio handsets communicate to the external telephone system through the CCU on a real time basis.

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