×

Double-Talk detector for echo canceller

  • US 5,631,900 A
  • Filed: 09/29/1995
  • Issued: 05/20/1997
  • Est. Priority Date: 09/29/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A double-talk detector for an echo canceller for selectively inhibiting the operation of an adaptive filter with coefficients that are updated and the echo canteller having an Echo Return Loss Enhancement (ERLE) value associated therewith, comprising:

  • an ERLE processor for calculating the current ERLE of the echo canceller;

    a SERLE register for storing an ERLE value as a SERLE value and having a saved ERLE input connected to the output of said ERLE processor and an output;

    a comparator for comparing the output of said ERLE processor with a value and, if less, then storing the output of said ERLE processor in said SERLE register; and

    a modification device for modifying the SERLE value stored in said register upon the occurrence of a predetermined event.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×