Circuit arrangement for a voice-controlled hands-free telephone

Details Circuit arrangement for a voice-controlled hands-free telephone Circuit arrangement for a voice-controlled hands-free telephone

1985-03-22

1987-03-03

Rubinson, Gene Z.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379388, H04M 160

Patent

active

046481109

ABSTRACT:
A voice-controlled hands-free facility contains a microphone, an internal and an external loudspeaker, and two series combinations of an input amplifier (EV), a variable attenuator (DR), and an output amplifier (AV), one for the send path and one for the receive path, and is controlled by a voice control unit (SS) connected to the output (E) of the input amplifier (EV), to the output (D) of the variable attenuator (DR), and, by a line (L), to an input of the variable attenuator (DR).
To permit the hands-free facility to be switched from a single-part mode of operation to a two-part mode, the output (E) of the input amplifier (EV) in the send path and/or the receive path is connected to the output (A) of the output amplifiers (AV) through a bypass device (BP) and a switching unit (T).

REFERENCES:
patent: 3100818 (1963-08-01), Carter
patent: 3659050 (1972-04-01), Carlsson et al.
patent: 3772472 (1973-11-01), Blomberg
patent: 4056696 (1977-11-01), Meyerle et al.
patent: 4396799 (1983-08-01), Franzen et al.
patent: 4497980 (1985-02-01), Gorman et al.
patent: 4513177 (1985-04-01), Nishino et al.
patent: 4558178 (1985-12-01), Yasuda et al.
"Voice Controlled Handsfree Subset for the Intermat Range", M. Slawik et al., Electrical Communication, vol. 53, No. 4, 1978, pp. 301-306.

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