Method and apparatus for performing echo suppression

Details Method and apparatus for performing echo suppression Method and apparatus for performing echo suppression

2004-02-17

2008-11-11

Singh, Ramnandan (Department: 2614)

Multiplex communications

Duplex

Transmit/receive interaction control

Reexamination Certificate

active

07450528

ABSTRACT:
An echo suppression technique is provided in which speech sample energies are collected and accumulated over predetermined time frames. From this, a peak aggregate value and time delay are noted. This peak is generated by mathematical correlation between the historical output speech and the input speech. A moving average is applied to the results of the mathematical correlation. Once the time delay and gain are determined, the algorithm of the present invention uses this information to determine if an input sample is echo or a valid input, and if it is echo, the echo is suppressed.

REFERENCES:
patent: 3673355 (1972-06-01), La Marche et al.
patent: 6167133 (2000-12-01), Caceres et al.
patent: 6269161 (2001-07-01), McLaughlin et al.
patent: 6662211 (2003-12-01), Weller
patent: 2002/0101830 (2002-08-01), LeBlanc
patent: 2002/0165718 (2002-11-01), Graumann et al.

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