Communications: electrical – Systems – Selsyn type
Patent
1982-08-24
1987-04-14
Caldwell, Sr., John W.
Communications: electrical
Systems
Selsyn type
340310A, 307 3, H04M 1104
Patent
active
046582380
ABSTRACT:
A method and apparatus for transmitting intelligence over a carrier wave are provided in which a signal wave form is indirectly added to a carrier wave to produce a composite wave having a recognizable pattern of variations in intervals that are defined by preselected locations in the composite wave. The pattern of variations in intervals resulting from the addition of the signal wave form to the carrier wave represents at least a portion of the intelligence to be transmitted over the carrier wave. The variations in intervals defined by the preselected locations in the carrier wave are detected and the detected interval variations are converted into a signal which has a characteristic that is a function of the recognizable pattern of interval variations. In the preferred embodiment, the intelligence is transmitted over an electric power distribution network utilizing the alternating voltage thereon as the carrier wave. By indirectly adding the signal wave form to the carrier wave, a simplified modulation system and method is provided which can be adjusted to control the amplitude of the signal wave.
REFERENCES:
patent: 2647253 (1953-07-01), Mackenzie
patent: 2853680 (1958-09-01), Nut
patent: 3488517 (1970-01-01), Cowan et al.
patent: 4106007 (1978-08-01), Johnston
patent: 4194128 (1980-03-01), Biglin
patent: 4218655 (1980-08-01), Johnston
patent: 4254403 (1981-03-01), Perez-Cavero
patent: 4370563 (1983-01-01), Vandling
patent: 4371867 (1983-02-01), Gander
patent: 4423477 (1983-12-01), Gurr
Electrical Review, Nov. 18, 1977, "Cyclocontrol Could Modify Daily Load Demand".
Public Lighting, Mar. 1977, "A New Electricity Control System".
J. Robert Eaton, Electric Power Transmission Systems, pp. 200-201, 1972.
Caldwell Sr. John W.
Emerson Electric Co.
Queen Tyrone
LandOfFree
Method and apparatus for providing selectively variable modulati does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for providing selectively variable modulati, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for providing selectively variable modulati will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1788798