Frequency division multiplex technique

Claim 1

A system for monitoring a plurality of condition responsive devices comprising: A. a plurality of channels each being connected to a respective condition responsive device; B. a master control station including: a. a channel select means for selecting a particular channel to be monitored, b. a BCD/binary converter coupled to the output of said channel select means for generating an initial binary number indicating the channel selected by said channel select means; c. a parity generator means coupled to the output of said BCD/binary converter for generating a parity signal when said initial binary number from said BCD/binary converter has an even number of ''''ones''''; d. a first oscillator driver, e. a plurality of identifying sending frequency sources coupled to said oscillator driver, f. a master control transmitter coupled to an output of said first oscillator driver, g. means for coupling the output of said BCD/binary converter to said first oscillator driver, h. means for coupling said parity signal from said parity generator means to said first oscillator driver for gating frequencies according to said initial binary number through said first oscillator driver to said master control transmitter, i. said master control transmitter transmitting a frequency multiplexed signal comprising said frequencies from said oscillator driver, C. a remote station for receiving said multiplex signal from said master control transmitter comprising: a. a receiver for receiving said multiplexed signal from said master control transmitter, b. a first bank of filters coupled to said receiver for separating said multiplexed signal into a plurality of frequencies, c. a first detector coupled to said bank of filters for converting said frequencies into a plurality of received binary signals, d. a random access multiplexer having inputs coupled to respective channels being monitored, e. means for supplying said received binary signals from said detector to said random access multiplexer for selecting a particular channel determined by said received binary signals, f. a second oscillator driver, g. a plurality of identifying receiver frequency sources coupled to said oscillator driver, h. a remote station transmitter coupled to said second oscillator driver, i. means for coupling an output of said random access multiplexer to said remote station transmitter for supplying a signal appearing on the selected channel to said transmitter, j. means for supplying said received binary signals from said detector to said oscillator driver for gating frequencies determined by said received binary number from said receiver frequency sources to said remote station transmitter, k. said remote station transmitter transmitting said frequencies from said receiver frequency sources and said signal appearing on said selected channel back to said master control station, D. means included in said master control station for receiving and recording said information transmitted back from said remote station transmitter, and E. means included in said master control station for converting said information received from said remote station to a returned binary number and comparing said returned binary number with said initial binary number for determining if an error occurred during transmission.

Claim 2

A system for monitoring a plurality of condition responsive devices comprising: A. a plurality of channels each being connected to a respective condition responsive device; B. a master control station including: a. a channel select means for selecting a particular channel to be monitored, b. a BCD/binary converter coupled to the output of said channel select means for generating an initial binary number indicating the channel selected by said channel select means; c. a parity generator means coupled to the output of said BCD/binary converter for generating a parity signal when said initial binary number from said BCD/binary converter has an even number of ''''ones''''; d. a first oscillator driver, e. a plurality of identifying sending frequency sources coupled to said oscillator driver, f. a master control transmitter coupled to an output of said first oscillator driver, g. means for coupling the output of said BCD/binary converter to said first oscillator driver, h. means for coupling said parity signal from said parity generator means to said first oscillator driver for gating frequencies according to said initial binary number through said first oscillator driver to said master control transmitter, i. said master control transmitter transmitting a frequency multiplexed signal comprising said frequencies from said oscillator driver, C. a remote station for receiving said multiplex signal from said master control transmitter comprising: a. a receiver for receiving said multiplexed signal from said master control transmitter, b. a first bank of filters coupled to said receiver for separating said multiplexed signal into a plurality of frequencies, c. a first detector coupled to said bank of filters for converting said frequencies into a plurality of received binary signals, d. a random access multiplexer having inputs coupled to respective channels being monitored, e. means for supplying said received binary signals from said detector to said random access multiplexer for selecting a particular channel determined by said received binary signals, f. a second oscillator driver, g. a plurality of identifying receiver frequency sources coupled to said oscillator driver, h. a remote station transmitter coupled to said second oscillator driver, i. means for coupling an output of said random access multiplexer to said remote station transmitter for supplying a signal appearing on the selected channel to said transmitter, j. means for supplying said received binary signals from said detector to said oscillator driver for gating frequencies determined by said received binary number from said receiver frequency sources to said remote station transmitter, k. said remote station transmitter transmitting said frequencies from said receiver frequency sources and said signal appearing on said selected channel back to said master control station, D. means included in said master control station for receiving and recording said information transmitted back from said remote station transmitter, and E. means included in said master control station for converting said information received from said remote station to a returned binary number and comparing said returned binary number with said initial binary number for determining if an error occurred during transmission.

Claim 3

A system for monitoring a plurality of condition responsive devices comprising: A. a plurality of channels each being connected to a respective condition responsive device; B. a master control station including: a. a channel select means for selecting a particular channel to be monitored, b. a BCD/binary converter coupled to the output of said channel select means for generating an initial binary number indicating the channel selected by said channel select means; c. a parity generator means coupled to the output of said BCD/binary converter for generating a parity signal when said initial binary number from said BCD/binary converter has an even number of ''''ones''''; d. a first oscillator driver, e. a plurality of identifying sending frequency sources coupled to said oscillator driver, f. a master control transmitter coupled to an output of said first oscillator driver, g. means for coupling the output of said BCD/binary converter to said first oscillator driver, h. means for coupling said parity signal from said parity generator means to said first oscillator driver for gating frequencies according to said initial binary number through said first oscillator driver to said master control transmitter, i. said master control transmitter transmitting a frequency multiplexed signal comprising said frequencies from said oscillator driver, C. a remote station for receiving said multiplex signal from said master control transmitter comprising: a. a receiver for receiving said multiplexed signal from said master control transmitter, b. a first bank of filters coupled to said receiver for separating said multiplexed signal into a plurality of frequencies, c. a first detector coupled to said bank of filters for converting said frequencies into a plurality of received binary signals, d. a random access multiplexer having inputs coupled to respective channels being monitored, e. means for supplying said received binary signals from said detector to said random access multiplexer for selecting a particular channel determined by said received binary signals, f. a second oscillator driver, g. a plurality of identifying receiver frequency sources coupled to said oscillator driver, h. a remote station transmitter coupled to said second oscillator driver, i. means for coupling an output of said random access multiplexer to said remote station transmitter for supplying a signal appearing on the selected channel to said transmitter, j. means for supplying said received binary signals from said detector to said oscillator driver for gating frequencies determined by said received binary number from said receiver frequency sources to said remote station transmitter, k. said remote station transmitter transmitting said frequencies from said receiver frequency sources and said signal appearing on said selected channel back to said master control station, D. means included in said master control station for receiving and recording said information transmitted back from said remote station transmitter, and E. means included in said master control station for converting said information received from said remote station to a returned binary number and comparing said returned binary number with said initial binary number for determining if an error occurred during transmission.

Claim 4

A system for monitoring a plurality of condition responsive devices comprising: A. a plurality of channels each being connected to a respective condition responsive device; B. a master control station including: a. a channel select means for selecting a particular channel to be monitored, b. a BCD/binary converter coupled to the output of said channel select means for generating an initial binary number indicating the channel selected by said channel select means; c. a parity generator means coupled to the output of said BCD/binary converter for generating a parity signal when said initial binary number from said BCD/binary converter has an even number of ''''ones''''; d. a first oscillator driver, e. a plurality of identifying sending frequency sources coupled to said oscillator driver, f. a master control transmitter coupled to an output of said first oscillator driver, g. means for coupling the output of said BCD/binary converter to said first oscillator driver, h. means for coupling said parity signal from said parity generator means to said first oscillator driver for gating frequencies according to said initial binary number through said first oscillator driver to said master control transmitter, i. said master control transmitter transmitting a frequency multiplexed signal comprising said frequencies from said oscillator driver, C. a remote station for receiving said multiplex signal from said master control transmitter comprising: a. a receiver for receiving said multiplexed signal from said master control transmitter, b. a first bank of filters coupled to said receiver for separating said multiplexed signal into a plurality of frequencies, c. a first detector coupled to said bank of filters for converting said frequencies into a plurality of received binary signals, d. a random access multiplexer having inputs coupled to respective channels being monitored, e. means for supplying said received binary signals from said detector to said random access multiplexer for selecting a particular channel determined by said received binary signals, f. a second oscillator driver, g. a plurality of identifying receiver frequency sources coupled to said oscillator driver, h. a remote station transmitter coupled to said second oscillator driver, i. means for coupling an output of said random access multiplexer to said remote station transmitter for supplying a signal appearing on the selected channel to said transmitter, j. means for supplying said received binary signals from said detector to said oscillator driver for gating frequencies determined by said received binary number from said receiver frequency sources to said remote station transmitter, k. said remote station transmitter transmitting said frequencies from said receiver frequency sources and said signal appearing on said selected channel back to said master control station, D. means included in said master control station for receiving and recording said information transmitted back from said remote station transmitter, and E. means included in said master control station for converting said information received from said remote station to a returned binary number and comparing said returned binary number with said initial binary number for determining if an error occurred during transmission.