Bi-directional multi-frequency ripple control system

Details Bi-directional multi-frequency ripple control system Bi-directional multi-frequency ripple control system

1987-08-24

1989-09-19

Moore, David K.

Communications: electrical

Systems

Selsyn type

340310R, H04M 1104

Patent

active

048685399

ABSTRACT:
A ripple control system in which an audio frequency signal is superimposed on an electric power distribution system wherein the receiver has a pair of lock-in amplifiers driven 90.degree. out of phase with each other, the outputs of which are squared and summed to form an output independent of phase. For discrimination, a microcomputer is programmed for logically examining the time between zero crossings of each of the outputs of the lock-in amplifiers so as to check the output frequency thereof and completely reject the incoming signal when the output frequency exceeds an acceptable level. This system provides a very narrow band frequency detector for the receivers and enables the use of a large number of closely spaced frequencies for the formation of signalling codes.

REFERENCES:
patent: 4106007 (1978-08-01), Johnson et al.
patent: 4359644 (1982-11-01), Foord

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