Apparatus for drawing and processing electrical power from a com

Details Apparatus for drawing and processing electrical power from a com Apparatus for drawing and processing electrical power from a com

1994-05-31

1997-03-04

Matar, Ahmad F.

Telephonic communications

Supervisory or control line signaling

Signal receiver

363 21, 379322, 379387, 379413, H04M 1900

Patent

active

056087926

ABSTRACT:
Apparatus powered from a communications line minimizes current drawn from the line by use of a variable power supply having a DC to DC conversion circuit controlled by an oscillator. The output of the DC to DC conversion circuit in a first lower power drawing mode is used to power a tone detection circuit which monitors the line for a wake-up tone. On receipt of an appropriate wake-up tone, the tone detection circuit provides an interrupt signal to a microprocessor which, in response, causes an increase in the oscillator frequency. The increased oscillator frequency then increases power drawn from the line via the DC to DC conversion circuit for operation in a second higher power drawing mode.

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Becker et al, "Sigfred: A Low-Power DTMF and Signaling Frequency Detector", IEEE Journal of Solid-State Circuits, vol. 26, No. 7, Jul. 1991, New York US, pp. 1027-1037, XP237045.

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