Communications: electrical – Continuously variable indicating – Plural transmitters
Patent
1985-02-22
1987-07-14
Myracle, Jerry W.
Communications: electrical
Continuously variable indicating
Plural transmitters
34087019, G01C 1508
Patent
active
046805850
ABSTRACT:
A multiple channel data transmission system is provided in which signals from a plurality of pulse operated transducers and a corresponding plurality of pulse operated signal processor channels are multiplexed for single channel FM transmission to a receiving station. The transducers and corresponding channel amplifiers are powered by pulsing the dc battery power to these devices to conserve energy and battery size for long-term data transmission from remote or inaccessible locations. Auto zeroing of the signal channel amplifiers to compensate for drift associated with temperature changes, battery decay, component aging, etc., in each channel is accomplished by means of a unique auto zero feature which between signal pulses holds a zero correction voltage on an integrating capacitor coupled to the corresponding channel amplifier output. Pseudo-continuous outputs for each channel are achieved by pulsed sample-and-hold circuits which are updated at the pulsed operation rate. The sample-and-hold outputs are multiplexed into an FM/FM transmitter for transmission to an FM receiver station for demultiplexing and storage in separate channel recorders.
REFERENCES:
patent: 3357007 (1967-12-01), Wike et al.
patent: 3909811 (1975-09-01), Adler
Constant Richard E.
Myracle Jerry W.
The United States of America as represented by the United States
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