Voltage-sensitive telephone line monitor

Details Voltage-sensitive telephone line monitor Voltage-sensitive telephone line monitor

1987-10-16

1989-01-31

Schreyer, Stafford D.

Telephonic communications

Multi-line or key substation system with selective switching...

Line status indication or call alerting

379350, 379377, H04M 324

Patent

active

048022071

ABSTRACT:
Detector circuitry monitors the line voltage on a telephone line to detect an off-hook condition. In order to accomodate varying line voltages and noise conditions, the circuitry automatically selects a threshold off-hook voltage by an iterative initialization procedure which is initiated on circuit power-up. The intialization procedure repeatedly compares the threshold voltage to the actual line voltage over a period of time to eliminate false off-hook detection due to noise.

REFERENCES:
patent: 4446338 (1984-05-01), Rosch
patent: 4456791 (1984-06-01), Forestier
patent: 4674117 (1987-06-01), Burns

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