Adaptive telephone receive control

Details Adaptive telephone receive control Adaptive telephone receive control

1988-05-16

1989-05-16

Lev, Robert

Telephonic communications

With check operated control

379395, 379145, H04M 1702

Patent

active

048316504

ABSTRACT:
A paystation telephone level control system is disclosed including a telephone receiver driven by a local amplifier and wherein two sets of attenuating resistors, a coarse attenuation set and a fine attenuation set, interface with connectable terminals of a binary control crosspoint switch. The presence or absence of coin tones and dialing tones are detected and the crosspoint switch discretely controlled by their presence to effect discrete levels of attenuation of signals fed to the receiver. In addition, the lever of attenuation during voice communications is a function of a pre-adjusted attenuation and a user selection.

REFERENCES:
patent: 3627950 (1971-12-01), Sand
patent: 3760101 (1973-09-01), Burns
patent: 3952160 (1976-04-01), Pasternack et al.
patent: 4024346 (1977-05-01), McDermott
patent: 4087647 (1978-02-01), Embree et al.
patent: 4385207 (1983-05-01), Munson
patent: 4718083 (1988-01-01), Boeckmann
patent: 4756022 (1988-07-01), Siligoni et al.
patent: 4759054 (1988-07-01), Mellon

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