Speech amplifier associated with an LED

Details Speech amplifier associated with an LED Speech amplifier associated with an LED

1995-08-30

1998-06-23

Zele, Krista

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379395, 379396, 379413, 3151693, H04M 122

Patent

active

057712867

ABSTRACT:
A transmit amplifier for a telephone set without its own power supply has an LED with an anode connected to a first positive terminal of the telephone line and a circuit that determines the ratio between the line current and the line voltage. The LED is supplied with a constant current and this current is derived when the voltage across the terminals of the line becomes lower than a predetermined value.

REFERENCES:
patent: 3745261 (1973-07-01), Friedman
patent: 3959602 (1976-05-01), Jayson
patent: 4564729 (1986-01-01), Mills
patent: 4975949 (1990-12-01), Wimsatt et al.
patent: 5280523 (1994-01-01), Lee
patent: 5422947 (1995-06-01), Azem
patent: 5570421 (1996-10-01), Morishima
European Search Report from European Patent Application No. 94410072.6, filed Aug. 31, 1994.
Patent Abstracts of Japan, vol. 12, No. 246 (e-632) Jul. 12, 1988 & JP-A-63 033 950 (NEC Corp.).

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