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Cordless parent/slave telephone set with improved sidetone handling

  • US 5,893,034 A
  • Filed: 08/06/1997
  • Issued: 04/06/1999
  • Est. Priority Date: 12/09/1994
  • Status: Expired due to Term
First Claim
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1. A cordless telephone set having a parent telephone set and a slave telephone set and having a radio transmitter/receiver executing bidirectional communications between said parent telephone set and said slave telephone set by subjecting an aural signal to digital talk processing, comprising:

  • a transformer which is an interface with a line and/or a receiver;

    a sidetone level reducing circuit for reducing a level of sidetone from said transformer;

    a first talk processing circuit for executing digital talk processing for an aural signal from said transformer or an aural signal received through an antenna of said parent telephone set;

    a second talk processing circuit for executing digital talk processing for an aural signal from a slave telephone set microphone or an aural signal received through a slave telephone set antenna;

    a delaying circuit for delaying an aural signal from said telephone set microphone by a specified delay time; and

    a level reducing circuit for reducing a level of said aural signal from said telephone set microphone according to an output from said delaying circuit;

    said specified delay time being set by said delaying circuit according to a time required for digital talk processing in said first talk processing circuit and said second talk processing circuit.

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