Echo removing apparatus

Details Echo removing apparatus Echo removing apparatus

2008-07-01

2008-07-01

Tsang, Fan S. (Department: 2742)

Telephonic communications

Echo cancellation or suppression

Residual echo cancellation

C379S406020, C379S406040

Reexamination Certificate

active

07394898

ABSTRACT:
An echo removing apparatus for reducing the echo caused by sound returning from a speaker to a microphone of a small-sized communication terminal, such as a portable telephone. The echo removing apparatus includes a filter unit for outputting a pseudo echo signal estimating an echo component returning to the microphone based upon a generated sound signal supplied to the speaker, a subtractor for subtracting the pseudo echo signal supplied from the filter unit from the sound generated collection signal supplied from the microphone and a first characteristics conversion unit for converting frequency characteristics of sound generated collection signals from the microphone on the frequency axis. The characteristics of the filter unit are controlled for minimizing an error component between an output signal of the first characteristics conversion unit and an output signal of the filter unit.

REFERENCES:
patent: 5414766 (1995-05-01), Cannalire et al.
patent: 5463618 (1995-10-01), Furukawa et al.
patent: 5479503 (1995-12-01), Fujiwara
patent: 5483594 (1996-01-01), Prado et al.

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