Telephone line current modulator
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United States of America Patent
Stats
-
May 30, 1995
Grant Date -
N/A
app pub date -
Jan 28, 1993
filing date -
Jan 29, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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