Signal processing

Details Signal processing Signal processing

2011-08-30

2011-08-30

Smith, Creighton (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406120

Reexamination Certificate

active

08009825

ABSTRACT:
The present invention relates to detection of echo in telecommunications networks. The invention provides a method of echo detection comprising the steps of: generating a series of inbound vectors for an inbound signal; generating a series of outbound vectors for an outbound signal; repeating a predetermined number of comparison steps comprising the sub-steps of selecting an outbound vector from the outbound vectors; selecting an inbound vector from the inbound vectors; comparing said outbound vector with said inbound vector and with successive inbound vectors to generate a plurality of similarity metrics; and determining a relative position of the compared outbound vector having maximum correlation with said inbound vector; and counting the number of times each relative position is determined to be the position of maximum correlation.

REFERENCES:
patent: 6092039 (2000-07-01), Zingher
patent: 2006/0140392 (2006-06-01), Ahmadi
patent: 2004/021679 (2004-03-01), None

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