Communications: electrical – Systems – Selsyn type
Patent
1983-03-16
1985-12-03
Ng, Jin F.
Communications: electrical
Systems
Selsyn type
375 45, 375 62, 375 81, 375 88, 329 50, H04L 2710, H03D 318, H03C 300
Patent
active
045568669
ABSTRACT:
A frequency shift keyed (FSK) data transmission system utilizes existing power lines to transmit data by superimposing a high frequency FSK signal on the power line carrier. A transmitter includes a phase locked loop which is locked on the power line carrier frequency and which synthesizes the FSK signal and a timing signal which defines the data rate of the transmitter. As each bit is transmitted, an oscillator control signal either speeds up or slows down the loop oscillator temporarily to produce the FSK signal. A receiver demodulates the data transmission from the power line by separating a power line carrier frequency component and a FSK signal component. The receiver includes a phase locked loop which locks onto the power line carrier frequency and which synthesizes a reference frequency and a timing signal which defines the data rate of the receiver. The receiver also includes a frequency discriminator circuit which compares the FSK signal with the synthesized reference signal and produces a digital data output signal at the data rate synthesized by the phase locked loop.
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Fairbairn David R.
Honeywell Inc.
Kuntz Curtis
Neils Theodore F.
Ng Jin F.
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