Synchronous data transmission system utilizing AC power line
First Claim
1. A data transmission system utilizing a power line coupled to an alternating current power supply for transmission of data having a plurality of bits, said data being transmitted in synchronism with the cycles of said alternating current power supply, said data transmission system comprising:
- a plurality of transmitters coupled to said power line; and
a plurality of receivers coupled to said power line;
each said transmitter including;
synchronizing signal generating means responsive to the cycles of said alternating current for generating a synchronizing signal in synchronism with the cycles of said alternating current,data generating means for generating data for transmittal, said data including receiver identifying information for identifying one of said receivers to receive said data being transmitted and control information for representing a control to be made in said one receiver,busy state information generating means for generating information representing that said data is being transmitted by said data generating means,each cycle of said alternating current comprising a first phase section for transmission of said busy state information and a second phase section for transmission of said data,transmitting means responsive to said synchronzing signal generating means of said transmitter, said data generating means and said busy state information generating means for transmitting a high frequency carrier wave signal representing said busy information in said first phase section of each cycle of said alternating current and for transmitting a high frequency carrier wave signal representing said data in said second phase section of each cycle of said alternating current,receiving means for receiving said high frequency carrier wave signal transmitted by other ones of said transmitters, andtransmission inhibiting means operatively coupled to said receiving means of said transmitter and said transmitting means of said transmitter for inhibiting transmission of said high frequency carrier wave signal in response to said busy state information of other transmitters;
each said receiver including;
synchronizing signal generating means responsive to the cycles of said alternating current for generating a synchronizing signal in synchronism with the cycles of said alternating current,receiving means responsive to said synchronizing signal generating means for receiving said high frequency carrier wave signals in said first and second phase sections of each cycle of said alternating current, anddecoding means responsive to said receiving means of said receiver for decoding said receiver identifying information and said control information being transmitted and for providing a control signal associated with said control information provided to said one receiver identified by said receiver identifying information.
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Accused Products
Abstract
A data transmission system utilizing a power line transmits a data signal of a plurality of bits in a serial fashion in synchronism with the cycles of the alternating current of a power supply. A start signal, channel section signal, control data signal and end signal are sequentially generated to transmit the control data to a selected receiver to control a desired output. Each cycle is divided into at least two phase sections, the one being used for a busy signal and the other being used for a data signal. The data transmission system includes a plurality of transmitters and a plurality of receivers coupled to the power line. Each of the transmitters comprises a receiving circuit for receiving a busy signal from other transmitters, a transmitting circuit for transmitting a data signal, a key input switch for operation, a selecting switch for selecting a channel which receives the transmitted data signal, and a memory for storing the key input signal. The transmitting circuit generates a data signal in response to the key input signal stored in the memory and to a non-busy signal. One embodiment of the transmission system of the present disclosure enables information to be transmitted over multiple-phase power lines.
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Citations
20 Claims
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1. A data transmission system utilizing a power line coupled to an alternating current power supply for transmission of data having a plurality of bits, said data being transmitted in synchronism with the cycles of said alternating current power supply, said data transmission system comprising:
a plurality of transmitters coupled to said power line; and a plurality of receivers coupled to said power line;
each said transmitter including;synchronizing signal generating means responsive to the cycles of said alternating current for generating a synchronizing signal in synchronism with the cycles of said alternating current, data generating means for generating data for transmittal, said data including receiver identifying information for identifying one of said receivers to receive said data being transmitted and control information for representing a control to be made in said one receiver, busy state information generating means for generating information representing that said data is being transmitted by said data generating means, each cycle of said alternating current comprising a first phase section for transmission of said busy state information and a second phase section for transmission of said data, transmitting means responsive to said synchronzing signal generating means of said transmitter, said data generating means and said busy state information generating means for transmitting a high frequency carrier wave signal representing said busy information in said first phase section of each cycle of said alternating current and for transmitting a high frequency carrier wave signal representing said data in said second phase section of each cycle of said alternating current, receiving means for receiving said high frequency carrier wave signal transmitted by other ones of said transmitters, and transmission inhibiting means operatively coupled to said receiving means of said transmitter and said transmitting means of said transmitter for inhibiting transmission of said high frequency carrier wave signal in response to said busy state information of other transmitters; each said receiver including; synchronizing signal generating means responsive to the cycles of said alternating current for generating a synchronizing signal in synchronism with the cycles of said alternating current, receiving means responsive to said synchronizing signal generating means for receiving said high frequency carrier wave signals in said first and second phase sections of each cycle of said alternating current, and decoding means responsive to said receiving means of said receiver for decoding said receiver identifying information and said control information being transmitted and for providing a control signal associated with said control information provided to said one receiver identified by said receiver identifying information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification