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Echo canceller with talk state determination to control speech processor functional elements in a digital telephone system

  • US 5,920,834 A
  • Filed: 01/31/1997
  • Issued: 07/06/1999
  • Est. Priority Date: 01/31/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus for speech processing in a digital telephone system, comprising:

  • an echo canceller for receiving a digitized speech-plus-echo signal, for receiving a far-end speech signal, and for providing an echo-suppressed output signal, said echo canceller comprising;

    state determination means for determining which talk states two speakers are engaged in, said state determination means providing a state information signal indicative of said talk states; and

    a tone detector responsive to said state information signal.

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