System for transmitting low frequency analog signals over AC pow

Details System for transmitting low frequency analog signals over AC pow System for transmitting low frequency analog signals over AC pow

1987-07-30

1989-09-05

Tarcza, Thomas H.

Communications: electrical

Systems

Selsyn type

H04M 1104

Patent

active

H00006785

ABSTRACT:
A system for transmitting low frequency analog signals over AC power lines using FM modulation. A low frequency analog signal to be transmitted is first applied to a voltage-to-frequency converter where it is converted to a signal whose frequency varies in proportion to the analog signal amplitude. This signal is then used to modulate the carrier frequency of an FM transmitter coupled to an AC power line. The modulation signal frequency range in selected to be within the response band of the FM transmitter. The FM modulated carrier signal is received by an FM receiver coupled to the AC power line, demodulated and the demodulated signal frequency is converted by a frequency-to-voltage converter back to the form of the original low frequency analog input signal.

REFERENCES:
patent: 4300125 (1981-11-01), Loshing et al.
patent: 4538136 (1985-08-01), Drabing
F. W. Gutzwiller, "Control Networks for the Home," Machine Design, Oct. 20, 1983, pp. 109-112.

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