Communications: electrical – Systems – Selsyn type
Patent
1980-06-12
1983-06-28
Groody, James J.
Communications: electrical
Systems
Selsyn type
34082558, 34082576, 340538, H04B 354
Patent
active
043908632
ABSTRACT:
A system for transmission of binary signals between components of an alarm installation and across a transmission path, including an external wire network, comprises a converter for converting each of two logical conditions of two binary signals into respective signal frequencies, a coupler for coupling the alarm installation to the external wire network, a clamping circuit for clamping both binary signals to the same amplitude, providing the binary signals representing the two logical conditions with respective signal frequencies within a given range of frequencies and with a given frequency separation, and a band pass filter circuit at the receiving end of the transmission path for detecting the information signals, and exhibiting a narrow band pass responsive characteristic which is symmetrical with respect to the mean frequency of the two binary signals. Components of the system include a modulator, transmitting point, coupler, band pass filter, demodulator, and associated amplifiers.
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Fritz Fuss Kom.-Ges Elektrotechnische Fabrik
Groody James J.
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