Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate
2007-03-14
2011-10-04
Jamal, Alexander (Department: 2614)
Telephonic communications
Echo cancellation or suppression
Using digital signal processing
Reexamination Certificate
active
08031863
ABSTRACT:
An apparatus and method for controlling acoustic echo cancellation in a mobile communication terminal are capable of improving phenomena occurring during a call, such as an echo phenomenon, muting phenomenon and fluctuation of transmitting signals, by performing real-time monitoring of the signal of a speaker output stage and effectively controlling an AEC function according to the characteristics of the terminal. The level of a receiving signal which is outputted to a speaker is detected. A transmitting signal, which is outputted from a microphone, is converted into a digital voice signal. A certain attenuation value is adaptively determined depending on the detected level of the receiving signal, and attenuation on transmitting signal is controlled according to the determined attenuation value.
REFERENCES:
patent: 4229735 (1980-10-01), Houck
patent: 5016271 (1991-05-01), Ford
patent: 5715309 (1998-02-01), Bartkowiak
patent: 5982755 (1999-11-01), Forrester et al.
Birch & Stewart Kolasch & Birch, LLP
Jamal Alexander
LG Electronics Inc.
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