Method of transferring digital information and street lighting control system
First Claim
1. A method of transferring digital information from a transmitting computer to a receiving computer which uses ordinary audio channels of communication comprising:
- generating wavelike control signals having first and second half periods with each of the second half periods corresponding in time-duration to the pulses or bits used for binary digits in logic circuits, only said second half periods signals being organized into logical words representing the digital information,transmitting said wavelike control signals by ordinary audio channels of communication to a receiver, andsupplying only said second half periods of said signals to said receiving computer.
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Accused Products
Abstract
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.
139 Citations
11 Claims
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1. A method of transferring digital information from a transmitting computer to a receiving computer which uses ordinary audio channels of communication comprising:
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generating wavelike control signals having first and second half periods with each of the second half periods corresponding in time-duration to the pulses or bits used for binary digits in logic circuits, only said second half periods signals being organized into logical words representing the digital information, transmitting said wavelike control signals by ordinary audio channels of communication to a receiver, and supplying only said second half periods of said signals to said receiving computer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for remote control of street lights over an area comprising:
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a programmable computer generating wavelike control signals at fundamental frequencies in the telephone voice range, said signals having first and second half periods with each of the second half periods corresponding in time-duration to the pulses or bits of binary digits in logic circuits only said second half periods signals being organized into logical words representing the digital information, means for transmitting said wavelike control signals by ordinary audio channels of communication, local receivers in said area receiving only said second half periods signals and including means for squaring-off the received said second half periods signals, local microcomputers receiving said squared-off signals, each microcomputer being programmed to respond to said signals only when they are legitimate and addressed to it, and local means controlled by local microcomputer for turning street lights off and on, and for dimming them.
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11. A system for remote control of street lights over an area comprising:
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a programmable computer generating wavelike control signals at fundamental frequencies in the telephone vice range, said signals having half periods corresponding in time-duration to the pulses or bits of binary digits in logic circuits, means for transmitting said signals by ordinary audio channels of communication, including a telephone line and a shared paging transmitter used primarily for paging and voice messages, local receivers in said area receiving said signals and including means for squaring-off the received signals, local microcomputers receiving said square-off signals, each microcomputer being programmed to respond to said signals only when they are legitimate and addressed to it, and local means controlled by the local microcomputer for turning street lights off and on, and for dimming them.
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Specification