Communications: electrical – Digital comparator systems
Patent
1976-08-09
1979-01-23
Pitts, Harold I.
Communications: electrical
Digital comparator systems
340163, 340147R, 340151, H04Q 900
Patent
active
041363337
ABSTRACT:
A terminal signal operation apparatus is disclosed for transmitting in a multiplex transmission system in both directions signals between the terminal signal operation apparatus and a central operation apparatus for centrally generating control signals for controlling a plurality of electrical devices at terminals in accordance with a signal generated by a signal source. The terminal signal operation apparatus includes a signal separation circuit for detecting the control signals transmitted from the central operation apparatus, a driving circuit whose input is connected to the output of the signal separation circuit for driving an electrical device in accordance with the control signals, a return signal generating circuit for generating a signal for transmission to the central operation apparatus upon detection of a malfunction of the electrical device or a malfunction of the signal source or a signal from the signal source so that the signals in both directions between the terminal signal operation apparatus and the central operation apparatus can be processed by a single circuit.
REFERENCES:
patent: 3222646 (1965-12-01), Hammer
patent: 3289166 (1966-11-01), Emmel
patent: 3522588 (1970-08-01), Clarke
patent: 3566399 (1971-02-01), Weld
patent: 3634824 (1972-01-01), Zinn
patent: 3715723 (1973-02-01), Fletcher
patent: 3803594 (1974-04-01), Klein
patent: 3806872 (1974-04-01), Odom
patent: 3854122 (1974-12-01), Cross
Ishii Mitsuaki
Nii Kazuo
Shimizu Osamu
Sumida Shizuo
Ueda Atsushi
Mitsubishi Denki & Kabushiki Kaisha
Pitts Harold I.
Toyo Kogyo Co. Ltd.
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