Programmable digital hysteresis circuit

Details Programmable digital hysteresis circuit Programmable digital hysteresis circuit

1984-12-12

1987-08-11

Krass, Errol A.

Boots, shoes, and leggings

35821315, H04N 521

Patent

active

046866400

ABSTRACT:
A digital hysteresis circuit which generates a stable signal for driving a digital readout indicator from an analog signal indicative of the position of a mechanical driving device having noise signal components leading to erratic indications superposed thereon.
A reference signal generated by an up-down counter is compared with the digitized input signal in a memory store. Only when the difference in the compared digital values exceeds a predetermined digital hysteresis value in the memory store corresponding to the allowable noise signals is a command signal generated to increment or decrement the counter so as to reduce the difference in digital value. The reference signal is applied to drive the digital readout indicator, thereby precluding unstable indications due to noise, jitter, and system threshold uncertainty.

REFERENCES:
patent: 4254469 (1981-03-01), Whitely
patent: 4412299 (1983-10-01), Huffman
patent: 4499547 (1985-02-01), Inuiya et al.

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