Low level bio-telemetry system using C/MOS multiplexing
First Claim
1. A multi-channel biotelemetry system for multiplexing and transmitting individual data samples derived as signal inputs from a plurality of electrode sources, comprising:
- a plurality of complimentary-type MOS switching mechanisms receivably-coupled one to each said data samples, said mechanisms being sequentially operated for cumulatively providing an output pulse train formed of said electrode source samplesbroadband main amplifying means receivably coupled to said output pulse train,pulse-position modulating means receivably-coupled to said amplified train for producing a sequence of output pulses spaced one from another a distance directly proportional to the amplitude of each pulse of said train,transmitter means coupled to said modulated output,resetable pulse-generating means for sequentially operating said plurality of switching mechanisms, said means being responsively coupled to said modulated pulse train for generating a separate switch-enabling pulse for each successively-received pulse, andmeans for synchronizing the resetting of said pulse-generating means after said switching mechanisms have been sequentially enabled.
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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.
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Citations
11 Claims
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1. A multi-channel biotelemetry system for multiplexing and transmitting individual data samples derived as signal inputs from a plurality of electrode sources, comprising:
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a plurality of complimentary-type MOS switching mechanisms receivably-coupled one to each said data samples, said mechanisms being sequentially operated for cumulatively providing an output pulse train formed of said electrode source samples broadband main amplifying means receivably coupled to said output pulse train, pulse-position modulating means receivably-coupled to said amplified train for producing a sequence of output pulses spaced one from another a distance directly proportional to the amplitude of each pulse of said train, transmitter means coupled to said modulated output, resetable pulse-generating means for sequentially operating said plurality of switching mechanisms, said means being responsively coupled to said modulated pulse train for generating a separate switch-enabling pulse for each successively-received pulse, and means for synchronizing the resetting of said pulse-generating means after said switching mechanisms have been sequentially enabled. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification