Hands-free telephone having a handset volume attenuator for cont

Details Hands-free telephone having a handset volume attenuator for cont Hands-free telephone having a handset volume attenuator for cont

1992-06-29

1993-05-18

Kuntz, Curtis

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379390, 379409, 379420, 4552491, H04M 1100

Patent

active

052127222

ABSTRACT:
A hands-free telephone for use on a vehicle includes a handset incorporating a radio section therein and a hands-free adapter incorporating a hands-free telephone unit therein. To prevent howling, the telephone includes two variable attenuators, or variolossers, each for changing the level of respective ones of a receive and a transmit signal to be applied to a speaker of the hands-free telephone unit and the radio section, respectively, so as to maintain the two levels in a predetermined relation. The telephone also includes in the radio section a variable resistor which may adjust the volume of voice signal to be delivered through an earpiece within the radio section which adjusts the volume of voice signal to be delivered through the speaker. The level-adjusted voice signal to be delivered through the speaker is controlled in level by a third variable attenuator simultaneously with the above-mentioned variable attenuators.

REFERENCES:
patent: 3214526 (1965-10-01), Mitchell
patent: 3942116 (1976-03-01), Ferguson et al.
patent: 4811390 (1989-03-01), Garabedian et al.
patent: 4982425 (1991-01-01), Yoshida
Popular Science advertisement, DAK Industries Inc., "Headphone Phone", Aug. 1983, p. 23.

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