Telephone receiver-off-hook detector

Details Telephone receiver-off-hook detector Telephone receiver-off-hook detector

1976-06-28

1977-07-05

Robinson, Thomas A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

1791752C, 324 51, H04M 322

Patent

active

040341623

ABSTRACT:
First and second alternating signals at a central office are applied to a telephone subscriber's lines. The level of the second signal current is used to control the level of the first signal. The nonlinear impedance vs. voltage characteristic of the subscriber's telephone in an off-hook state causes harmonics of the first signal to be generated. Harmonics so generated are detected at the central office to indicate the presence of a receiver-off-hook telephone.

REFERENCES:
patent: 3287502 (1966-11-01), Rohrig

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