Echo canceller for attenuating acoustic echo signals on a freque

Details Echo canceller for attenuating acoustic echo signals on a freque Echo canceller for attenuating acoustic echo signals on a freque

1982-06-30

1987-06-02

Rubinson, Gene Z.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379410, H04B 320

Patent

active

046709037

ABSTRACT:
For use in combination with a loudspeaker and at least one microphone, for example, by attendants in an auditorium, an echo cancelling circuit comprises a self-adaptive echo canceller responsive to a lower frequency component, such as below 1.7 kHz, of a receive-in signal for self-adatively cancelling a corresponding component of a reverberation signal included in a send-in signal during each interval during which an audio signal reaches the circuit from a remote party. For a higher frequency reverberation signal component, an echo suppressor or a voice switch may reduce a weaker one of two signals which are either the higher frequency send-in and receive-in signal components or a combination of a reverberation component cancelled signal with the higher frequency send-in signal component and the whole receive-in signal. Alternatively, a less expensive echo canceller non-adaptively cancels a part of the reverberation signal in response to the receive-in signal. The lower frequency component of the partially reverberation cancelled signal is used by the self-adaptive echo canceller as the lower frequency send-in signal component. An acoustic output may once be reproduced by the loudspeaker in response to the receive-in signal and then converted to an electric signal for supply to the echo cancelling circuit.

REFERENCES:
patent: 3754105 (1973-08-01), Poschereider et al.
patent: 3784747 (1974-01-01), Berkley et al.
patent: 4225754 (1980-09-01), Bernard et al.
patent: 4362909 (1983-12-01), Snijders et al.

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