Telephone line current modulator

Details Telephone line current modulator Telephone line current modulator

1993-01-28

1995-05-30

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379388, 379395, H04M 162

Patent

active

054209196

ABSTRACT:
A telephone set connected to a telephone line including a supply circuit providing an output current which is an increasing function of the voltage available on the telephone line; a speech amplifier supplied by the output current; and a modulator having a quiescent current and operable to inject into the line a modulation current proportional to a speech signal. The modulator incorporates the supply circuit, the current consumed by the modulator being essentially the current provided to the amplifier by the supply circuit.

REFERENCES:
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Patent Abstracts of Japan, vol. 9, No. 280 (E-356)(2003) Nov. 8, 1985.
SGS-Thomson Microelectronics TEA7063 "Speed Circuit With Power Management" Jun. 1990 Datasheet.

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