Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1976-11-24
1978-10-03
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
324 78D, 340347M, H03K 1320
Patent
active
041186966
ABSTRACT:
An analog-to-frequency converter to provide an open-loop encoder of analog signals. An analog signal is injected into a voltage-to-frequency (VFO) converter to change the analog signal to a duty cycle having an UP-time to DOWN-time ratio equal to the ratio between the input analog voltage and an externally applied precision voltage level. The duty cycle signal is then "ANDED" with a clock signal to form a VFO signal pulse train which is essentially the clock signal during the UP time of the duty cycle signal. The maximum count of a clock signal counter determines the sampling period. The VFO pulses are accumulated during the sampling period so that when the clock signal counter reaches the maximum count, the accumulated number is transferred to a storage register and the accumulator reset to zero in preparation to receive and accumulate the VFO signals of the next sample period. This transfer is made in response to signals from a time-gate generator. The clock signal synchronizes the VFO converter and the time-gate generator so that the overall accuracy is a function of the clock's short-term stability rather than an accurate time-base signal pulse width. High VFO input to output isolation may be achieved by optically coupling the input to the output signal and providing transformer coupling between the power source and the output signal ground to thereby achieve a floating output voltage.
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Gerry Martin E.
Hughes Aircraft Company
MacAllister W. H.
Sloyan Thomas J.
Wood Gregory B.
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