Circuit for hands free talking

Details Circuit for hands free talking Circuit for hands free talking

1995-11-01

1996-09-24

Hofsass, Jeffery

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379388, 379389, H04M 160, H04M 908

Patent

active

055598803

ABSTRACT:
A circuit for hands free talking is mounted between a telephone main body for use in a vehicle, and a speaker and a microphone to realize hands free talking of a user of the telephone. In the circuit, an electronic volume controller is for use in audio signal processing, and the electronic volume controller includes a transmitting variable attenuator, a receiving variable attenuator, and an attenuator controller. A receiving level detector is provided to detect a signal level of a receive signal from the telephone main body, and decreases attenuation of the receiving variable attenuator and increases attenuation of the transmitting variable attenuator when a high signal level is detected.

REFERENCES:
patent: 4555596 (1985-11-01), Blomley
patent: 4648110 (1987-03-01), Elsasser
patent: 4726062 (1988-02-01), Martz et al.
patent: 4879745 (1989-11-01), Arbel
patent: 4891837 (1990-01-01), Walker et al.
patent: 4982425 (1991-01-01), Yoshida
patent: 4989242 (1991-01-01), Arnaud
patent: 5235637 (1993-08-01), Kraz et al.
patent: 5398786 (1995-03-01), Kurokawa et al.
patent: 5459786 (1995-10-01), Tomiyori et al.
patent: 5471528 (1995-11-01), Reesor

Affiliated with

Also associated with

Rating

Circuit for hands free talking does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit for hands free talking, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for hands free talking will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1935886