Electronic telephone terminal having noise suppression function

Details Electronic telephone terminal having noise suppression function Electronic telephone terminal having noise suppression function

1988-07-15

1990-03-13

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379395, 379390, 381113, 381114, H04M 160

Patent

active

049088556

ABSTRACT:
An electronic telephone terminal having a transmitter and a receiver, both having an approximately linear acoustic-to-electric transduction characteristics, and having a surrounding noise suppression function, and including a variable attenuator for controlling a gain of a transmission system; a noise detection device for detecting surrounding noise; and a control device for controlling the variable attenuator in such a manner that when a sound pressure level input to the transmitter exceeds a predetermined threshold value, the gain is fixedly set to a constant value, and when the input sound pressure level is equal to or below the predetermined threshold level, the gain is controlled in response to a change in the surrounding noise level detected by the noise detection device.

REFERENCES:
patent: 3410958 (1968-11-01), Cohen
patent: 3588360 (1971-06-01), Knox
patent: 4068092 (1978-01-01), Ikoma et al.
patent: 4513177 (1985-04-01), Nishino et al.
patent: 4696032 (1987-09-01), Levy
Patent Abstracts of Japan, vol. 8, No. 239 (E-276) [1676], Nov. 2, 1984; & JP-A-59 117 849 (Nippon Denshin Denwa Kosha) 07-07-1984.

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