Title: Systems for transmitting information in an alternating current electricity supply system

Abstract: A system for transmitting information in an alternating current supply system wherein information is transmitted by reducing the instantaneous value of the supply voltage during a corresponding period in each of a selection of cycles of the supply voltage, the selection of cycles determining the information transmitted. To minimize disturbance of the system voltage the period of alteration includes a voltage zero. The alteration is effected by closing a switch connected across the system for the period the voltage reduction is required.

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Inventors: Perez-Cavero, Leonardo (Media, PA, US)
Cross, Michael W. A. (Bristol, GB)
Fielding, Geoffrey (Stafford, GB)
Gray, Frederick M. (Stafford, GB)

Application Number: 063965
Filing Date: 1979-08-06
Publication_date: 1981-03-03
Assignee: The General Electric Company Limited (London, GB2)
Primary Class(es): 340/310.04 327/336, 340/310.05, 340/310.07
Other Classes:
US Patent Ref:

3488517	Jan, 1970	Cowan et al.	340/310.
3594584	Jul, 1971	Woods	340/310.
3714451	Jan, 1973	Whitney et al.	340/310.
3818466	Jun, 1974	Honda	340/310.

Other Refs:
Primary Examiner: Groody, James J.
Assistant Examiner:
Attorney: Kirschstein, Kirschstein, Ottinger & Cobrin