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Multi-channel cordless telephone system for maintaining master-slave communication

  • US 5,375,163 A
  • Filed: 04/20/1992
  • Issued: 12/20/1994
  • Est. Priority Date: 04/25/1991
  • Status: Expired due to Term
First Claim
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1. A cordless telephone having a master unit and a slave unit and using a plurality of communication channels for communication between the master unit and the slave unit and employing an identification code indicating that the master unit and the slave trait are coupled with each other, the master unit having first channel changing means responsive to a user'"'"'s operation for freely changing a communication channel currently being used by the master unit, the slave unit having second channel changing means responsive to a user'"'"'s operation for freely changing a communication channel currently being used by the slave unit, storage means for storing information representing a usually-used-channel, receiving means for receiving information, transmitting means for transmitting information, control means for controlling the second channel changing means and the storage means and the transmitting means, wherein the master unit transmits and receives a signal through an initially-used-channel determined from the identification code, wherein, in case the master unit does not normally reply to the slave unit when the slave unit transmits a signal to the master unit, the control means causes the second channel changing means to change the communication channel currently being used by the slave channel into the initially-used-channel and then causes the receiving means and the transmitting means to perform an exchange of data with the master unit through the initially-used-channel and further causes the transmitting means to transmit information representing the usually-used-channel stored in the storage means through the initially-used-channel.

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