Speech direction detection circuits for telephone communication

Details Speech direction detection circuits for telephone communication Speech direction detection circuits for telephone communication

1981-04-30

1984-03-06

Rubinson, G. Z.

H04M 908

Patent

active

044356218

ABSTRACT:
A device for detecting the direction of speech transmission between a telephone communication device and a telephone line connected thereto comprises a detection circuit for detecting coincidence in the phase of speech signals developed across respective impedances and an impedance network by which said device is coupled to the telephone line. The detection circuit comprises a pulse generating circuit for generating trains of pulses in response to excursions of the respective signals across a reference level, and a gating circuit responsive to the coincidence of pulses of the respective trains. In a device with separate amplification of talk and listen channels, the amplifier providing the output to the line is preferably an operational amplifier connected to have substantially zero output impedance, which makes possible a simple configuration of an impedance network of which respective impedances are effectively connected either in series or in parallel, in accordance with the direction of speech transmission. Such impedance network thus provides for the appropriate change in the phase relationship of signals developed across the respective impedance.

REFERENCES:
patent: 3395255 (1968-07-01), Clement
patent: 3714380 (1973-01-01), Berryman et al.
patent: 4008376 (1977-02-01), Flanagan et al.
patent: 4107473 (1978-08-01), Pierce
patent: 4115658 (1978-09-01), Williams
patent: 4346261 (1982-08-01), Hestad et al.

Affiliated with

Also associated with

Rating

Speech direction detection circuits for telephone communication does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Speech direction detection circuits for telephone communication , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speech direction detection circuits for telephone communication will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-743125