Voltage detector circuit

Details Voltage detector circuit Voltage detector circuit

1981-12-21

1984-01-31

Brown, Thomas W.

328151, H03K 1716, H04B 346, H04M 322

Patent

active

044291850

ABSTRACT:
A voltage detector circuit for detecting a DC voltage on a line in the presence of a substantially fixed frequency AC voltage. The circuit may be used to detect call originations on a telephone line having longitudinal AC voltages induced thereon. The circuit compares the instantaneous voltage on the line with a reference level and repetitively increments a counter when the instantaneous voltage exceeds the reference level and repetitively decrements the counter when the instantaneous voltage does not exceed the reference level. After operating the counter for a time interval substantially equal to the period of the fixed frequency AC voltage, the most significant bit of the counter will indicate whether the DC voltage on the line is above the reference level. The circuit may also be used to detect call terminations on the line.

REFERENCES:
patent: 3312787 (1967-04-01), Jorgensen
patent: 3735263 (1973-05-01), Boatwright
patent: 4022980 (1977-05-01), Kitajewski et al.
patent: 4110569 (1978-08-01), Schindler et al.
patent: 4132864 (1979-01-01), Feng
patent: 4158109 (1979-06-01), Dijkmans et al.
patent: 4356355 (1982-10-01), Ferrieu et al.
patent: 4362908 (1982-12-01), Melindo

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