Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1983-03-28
1986-04-01
Roskoski, Bernard
Communications: electrical
Audible indication
Percussion-type sound producer
340 52R, 73116, A03M 112
Patent
active
045801274
ABSTRACT:
An A/D converter includes a limiting circuit for limiting the amplitude of bipolar input signals. A comparator compares the amplitude limited signals with reference voltages and provides pulse output signals corresponding to the duration of each half-cycle of the bipolar signals. The pulse output signals are applied to a counter circuit which counts clock pulses for each of the half-cycle intervals to provide a digital word for each half-cycle of bipolar signal information which accurately indicates the duration of each half-cycle of the input signal. The A/D circuit is employed, in one embodiment of the present invention, with a microprocessor programmed to analyze the engine speed signals from a tachometer according to a prescribed relationship to provide output information useful for predicting when engine maintenance is required.
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Adaptation of the Howell TTRI for J57-P-420 Cumulative LCF Damage Determination, dated Sep. 16, 1971.
Jet Electronics & Technology Inc.
Roskoski Bernard
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