Double talk activity detector and method for an echo...

Details Double talk activity detector and method for an echo... Double talk activity detector and method for an echo...

2006-05-16

2006-05-16

Harold, Jefferey F. (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Disable or inhibit function

C379S406060, C379S406010, C379S406050

Reexamination Certificate

active

07046794

ABSTRACT:
A double talk activity detector (30) and method for an echo canceler circuit (10) improves the probability of detecting a double talk condition based on at least pre-echo canceler uplink data (40). The echo canceler circuit (10) includes a double talk activity probability data generator (30) and an echo canceler stage (20). The double talk activity probability data generator (30) receives pre-echo canceler uplink data (40) and in response produces double talk activity probability data (50). The echo canceler stage (20) is coupled to the double talk activity probability data generator (30) and receives downlink data (60), pre-echo canceler uplink data (40) and the double talk activity probability data (50) and in response produces attenuated uplink data (70).

REFERENCES:
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patent: 6195430 (2001-02-01), Eriksson et al.
patent: 6532454 (2003-03-01), Werbos
patent: 6718035 (2004-04-01), Younce et al.
patent: 6868158 (2005-03-01), Takahashi et al.

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