Voice conference system using echo cancellers

Details Voice conference system using echo cancellers Voice conference system using echo cancellers

1989-06-20

1991-06-25

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379388, H04M 100

Patent

active

050273930

ABSTRACT:
A voice conference system using echo cancelers. The system consists of at least two microphone to send out voice signals to a remote location, and a loudspeaker which receives in voice signals from the remote location. To prevent the microphone from picking up the loudspeaker sound, each microphone is hooked to the separate terminal of a comparator. Thus the a person's voice in one microphone will pass, but the loudspeaker sound being received equally by both microphones will be cancelled.

REFERENCES:
patent: 4184048 (1980-01-01), Alcaide
patent: 4703506 (1987-10-01), Sakamoto et al.
patent: 4712244 (1987-08-01), Zwicker et al.
patent: 4802227 (1989-01-01), Elko et al.
patent: 4819263 (1989-04-01), Franklin
patent: 4860366 (1989-08-01), Fukushi et al.

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