Communications: electrical – Continuously variable indicating – Plural transmitters
Patent
1986-04-02
1988-05-10
Caldwell, Sr., John W.
Communications: electrical
Continuously variable indicating
Plural transmitters
34087016, 34087038, 340500, 34087019, 34087024, G08C 1904
Patent
active
047439017
ABSTRACT:
A signal transmission system has a plurality of sensors, a plurality of modulation circuits connected to the sensors, a single demodulation circuit and a single power supply line for connecting the modulation circuits to the demodulation circuit. Each of the sensors has a resistor-capacitor type oscillation circuit of which the capacity varies with the variation of a physical quantity to be measured and outputs an oscillation output of the oscillation circuit as a sensor signal. Each of the modulation circuit has a one-shot circuit having a predetermined set time different from another one-shot circuit of another modulation circuit for sustaining the sensor signal for the predetermined set time. Each of the modulation circuits further has a transistor for switching and a zener diode of a zener voltage different from that of another zener diode of another modulation circuit. The transistor connects the zener diode to the electric power line to lower the voltage of the electric power line to the zener voltage when the sensor signal is inputted. The demodulation circuit has a plurality of comparators and a logic circuit. Each of the comparators compares the voltage of the power supply line with a reference voltage to generate a comparison signal. The logic circuit performs a logical operation of the comparison signals from the comparators to obtain the sensor signals at different output terminals.
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Kitagawa Junji
Yamanoue Kouichi
Caldwell Sr. John W.
Nippon Soken Inc.
Oberley Alvin
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