Loudspeaker telephone device comprising a novel noise suppressin

Details Loudspeaker telephone device comprising a novel noise suppressin Loudspeaker telephone device comprising a novel noise suppressin

1994-11-22

1995-10-17

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379388, 379420, 455222, H04M 160

Patent

active

054597862

ABSTRACT:
Controlled by a signal level produced by a microphone (12), a noise suppressing circuit (25) supplies a first attenuator (16) with a local level which is equal to the signal level and is suppressed to a predetermined output level when the signal level is lower and higher than a predetermined input level. Cooperating with a drive level produced by a second attenuator (17) to drive a loudspeaker (13), the local level makes a comparator unit (21-23) produce a control signal for making the first attenuator give smaller and greater amounts of attenuation to the signal level with the drive level rendered by the second attenuator low and high when positive and negative values are had, respectively, by an input difference equal to the local level less the drive level. Preferably, the local level is suppressed by a level difference had by the signal level above the predetermined input level.

REFERENCES:
patent: 4317959 (1982-03-01), Kuriki
patent: 4715063 (1987-12-01), Haddad et al.
patent: 4847897 (1989-07-01), Means
patent: 4891837 (1990-01-01), Walker et al.
patent: 4908855 (1990-03-01), Ohga et al.
Patent Abstracts of Japan, vol. 013, No. 539 (E-853) 30 Nov. 1989.

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