Telecommunications device for the hearing impared

Details Telecommunications device for the hearing impared Telecommunications device for the hearing impared

1984-04-11

1986-08-26

Brady, W. J.

179 2DP, 179 84VF, 179 84L, H04M 1100

Patent

active

046084576

ABSTRACT:
This apparatus having means responsive to a dual multifrequency telephone output to provide an electrical signal to an automatic gain control so as to provide preconditioning to a signal for amplification so as to provide an amplified signal to a comparator with visual light source responsive thereto to indicate activity at the other end of the phone line and a tone decoder also receiving the amplified signal to a digital binary code corresponding to the dual tone multifrequency signal received.

REFERENCES:
patent: 3585303 (1971-06-01), Chieffo
patent: 4012599 (1977-03-01), Meyer
patent: 4046970 (1977-09-01), Castleman
patent: 4307266 (1981-12-01), Messina
patent: 4379210 (1983-04-01), Sparber
patent: 4426555 (1984-01-01), Underkoffler

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