Communications: electrical – Digital comparator systems
Patent
1975-06-16
1976-06-08
Habecker, Thomas B.
Communications: electrical
Digital comparator systems
340206, 307251, G08C 1506
Patent
active
039626970
ABSTRACT:
A low-power, transient-free, multi-channelled bio-telemetry system utilizes series of C/MOS switches coupled to the data sampling electrodes. Shift register pulses selectively enable the switches to sequentially shift the data sample inputs through nine, switch-controlled channels. The switches have little battery drain and, due to their N and P complimentary arrangement, their gating pulses are effectively cancelled and removed from the system channels. Multiplexing precedes amplification by applying switch outputs to a single, low-power amplifier. A special pulse position modulator employing a ramp generator circuit provides the pulse trains to a keyed transmitter. Other significant improvements including a unique shift register arrangement with a synchronizing interval permit long periods of continuous operation undisturbed by the need for battery changes. The transmitted data is received by a suitable demodulating receiver to produce a recordable output for evaluation and computer analysis.
REFERENCES:
patent: 3132329 (1964-05-01), Penter
patent: 3249883 (1966-05-01), Bernecke
patent: 3626398 (1971-12-01), Owens
patent: 3665399 (1972-05-01), Zehr
Critchlow Paul N.
Habecker Thomas B.
Sciascia Richard S.
The United States of America as represented by the Secretary of
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