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Baseband signal processing unit and method of operating the same

  • US 5,001,742 A
  • Filed: 01/29/1990
  • Issued: 03/19/1991
  • Est. Priority Date: 01/29/1990
  • Status: Expired due to Term
First Claim
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1. A baseband processing unit comprising:

  • processor means for;

    (a) periodically acquiring and processing a first (forward) voice signal, (b) periodically producing successive digitized samples of a first supervisory audio tone (SAT) during the interval between successive acquisitions of the forward voice signal;

    (c) periodically acquiring and processing a second (reverse) voice signal, and (d) detecting the presence of a second SAT by sampling successive digitized samples thereof and establishing their power during the interval between successive acquisitions of the forward voice signal; and

    communication means for communicating the forward and reverse voice signals to and from the processor and for carrying the first SAT signal from the processor and for carrying the second SAT to the processor.

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