Energy detection circuit for a facsimile system controller

Details Energy detection circuit for a facsimile system controller Energy detection circuit for a facsimile system controller

1984-05-23

1986-01-28

Dwyer, James L.

179 81R, H04M 1100

Patent

active

045673284

ABSTRACT:
Disclosed is an energy detection circuit for use in a facsimile system autodialer/controller. The circuit monitors a telephone line and nulls out transmit tones leaving only receive signals. The analog receive signals are processed to produce a digital signal indicating the on-off times of receive energy on the telephone line. The energy on-off times may then be evaluated by a microprocessor included in the facsimile system autodialer/controller to determine whether a dial tone, busy signal or ring back is being received.

REFERENCES:
patent: 3748395 (1973-07-01), Herter
patent: 4012600 (1977-03-01), Warren
patent: 4178485 (1979-12-01), Cowpland et al.
patent: 4213016 (1980-07-01), Brockmann et al.
patent: 4241237 (1980-12-01), Paraskevakos et al.
patent: 4281219 (1981-07-01), Cowpland et al.
patent: 4315106 (1982-02-01), Chea, Jr.
patent: 4405833 (1983-09-01), Cave et al.

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