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Two-way paging system transmission direction sensing and control apparatus and method

  • US 4,107,473 A
  • Filed: 04/29/1977
  • Issued: 08/15/1978
  • Est. Priority Date: 04/29/1977
  • Status: Expired due to Term
First Claim
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1. A voice paging and response system control adapted to be installed between a telephone at a master station and a speaker/microphone at a remote station, and operating in conjunction with a paging amplifier to drive the speaker, comprisingan amplifier connected to receive a remote signal initiated at the speaker/microphone and providing an amplified remote signal,means for sensing the amplified remote signal and providing a remote signal timing indicative output,means for sensing the paging signal initiated at the telephone providing a paging signal timing indicative output,means for comparing said paging and remote signal timing indicative output and providing a paging signal leading output when the former leads the latter, and means responsive to said paging signal leading output for coupling the paging amplifier to the speaker, whereby said paging signals are coupled thereto, said last named means operating to decouple the paging amplifier from the speaker and to couple said amplifier to the telephone in the absence of said paging signal leading output.

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