Call signal detecting device

Details Call signal detecting device Call signal detecting device

1985-04-09

1987-01-27

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

358257, 379 94, 379100, 379386, H04N 132

Patent

active

046395539

ABSTRACT:
In a facsimile communication system, a call signal detecting device for identifying call signals which are received over a network. Both an unsounding call signal and a sounding call signal are detected by a single detection circuitry, which is also responsive to off-hooking of an own station's telephone set. Detection of such signals is implemented by the measurement of a period which is performed by a processing unit, so that changes in the specifications of the signals to be detected can be accommodated merely by modifying a program of the processing system and not the hardware of the device.

REFERENCES:
patent: 3914539 (1975-10-01), Hashimoto
patent: 4249216 (1981-02-01), Kanda
patent: 4346410 (1982-08-01), Maeno

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