Method of transferring digital information and street lighting control system

摘要

Remote control of street lights utilizes a programmable computer which generates wavelike control signals at fundamental frequencies in the voice range and having half periods corresponding in time-duration to the pulses used for binary digits in logic circuits. The signals are transmitted by phone line to a shared paging transmitter which broadcasts them over the city. The signals are received by radio receives contained in local controller boxes from which the power lines to luminaires start out. The output of the receiver is driven to a saturating level in order to square off the received signals for a microcomputer programmed to decode the signals when they are legitimate and properly addressed to it. The microcomputer can turn the 230 v 60 Hz AC power line to the luminaires off or on, and can also turn on a local oscillator to inject an RF carrier signal onto the AC power line for energizing a dimming circuit in the luminaires.