Two-way loudspeaking device for telephone stations

Details Two-way loudspeaking device for telephone stations Two-way loudspeaking device for telephone stations

1977-03-21

1978-07-18

Brown, Thomas W.

H04M 908

Patent

active

041017358

ABSTRACT:
A handsfree telephone set uses a single transducer as microphone and speaker. A switching arrangement senses and compares the relative strength between received and transmit signals, and switches signal paths accordingly. By sensing the input of the receive path versus the output of the transmit path, the detectors are thus asymmetrically coupled, to provide a break-in capability from one side (the telephone central or calling party) only.

REFERENCES:
patent: 2819340 (1958-01-01), Brody
patent: 3030445 (1962-04-01), Hitch et al.
patent: 3499115 (1970-03-01), Sontag
patent: 3725585 (1972-03-01), Moniak
patent: 3849603 (1974-11-01), Proios
patent: 3904834 (1975-09-01), Shinoi et al.

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