Voice echo cancellation for SVD modems

  • US 6,310,864 B1
  • Filed: 06/19/1997
  • Issued: 10/30/2001
  • Est. Priority Date: 06/19/1997
  • Status: Expired due to Term
First Claim
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1. A first simultaneous voice and data modem associated with a switching hub of a communications network, comprising.a modulated voice and data port adapted to transmit and receive a modulated simultaneous voice and data signal to and from a second simultaneous voice and data modem located at an endpoint of said communications network;

  • a demodulated voice port for transmitting and receiving a voice signal to and from a communications device via a switching network;

    a demodulated data port for transmitting and receiving a data signal; and

    a digital signal processor electrically coupled to said modulated voice and data port and said demodulated voice port, said digital signal processor associated with said first simultaneous voice and data modem for canceling a voice echo originating in said switching network and received by said demodulated voice port, said voice echo experiencing a delay resulting from the modulation and demodulation of said simultaneous voice and data signal in said first simultaneous voice and data modem and said second simultaneous voice and data modem.

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