Multi-frequency signalling system

Details Multi-frequency signalling system Multi-frequency signalling system

1974-09-11

1976-06-01

Claffy, Kathleen H.

H04M 150

Patent

active

039611434

ABSTRACT:
A multi-frequency receiver is provided as part of a system able to evaluate the presence of 2 out of 5 signals and which incorporates 5 channel paths each including a parallel resonant circuit each of which is tuned to a distinct one of the frequencies of the 5 signals. In each channel path a first and second detection circuit is coupled to the corresponding resonant circuit and reacts when the voltage at the coupling point is larger than a respective common first or second threshold voltage, the second of which is larger than the first one. When spurious signals are received, at least one of the first detection circuits will react and the 2 out of 5 evaluation circuit is blocked. When a second detection circuit in a channel path reacts, the effect of the first one in this channel path is inhibited. Only signals having a well determined frequency combination are evaluated.

REFERENCES:
patent: 3072747 (1963-01-01), Stallworthy
patent: 3128349 (1964-04-01), Boesch
patent: 3539731 (1970-11-01), Legedza

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