Coded data generation or conversion – Converter compensation
Patent
1994-06-24
1996-10-22
Hoff, Marc S.
Coded data generation or conversion
Converter compensation
341158, 123417, H03M 106
Patent
active
055681417
ABSTRACT:
A waveform-shaping apparatus for determining engine speed of an automotive vehicle is provided. The apparatus includes a waveform-shaping circuit including a comparator for comparing an input analog signal, alternating in synchronism with rotation of an engine, with a reference signal, so as to produce a binary-coded signal, provided with high and low levels, indicative of the engine speed. A hysteresis providing circuit provides first and second hysteresis components having first and second hysteresis levels to the input analog signal and the reference signal, respectively, to increase a difference in level between the input analog signal and the reference signal so as to mask the influence of noise from interfering with an operation of the waveform shaping circuit. A correcting circuit corrects at least either of the first and second hysteresis levels and time periods during which the first and second hysteresis components are applied, in a preselected relation to a given noise factor.
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Hoff Marc S.
Nippondenso Co. Ltd.
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