Signal decision system
First Claim
1. A signal decision system comprising, in combination, a detector means for detecting a signal from an object to be measured, a filter means connected to said detector means for filtering the output signal from said detector means, a comparison means connected to said filter means for comparing the output signal from said filter means with a reference signal for producing a pulsed signal when said output signal from said filter means has a level not less than a predetermined level, and a decision generation means connected to said comparison means for counting said pulsed signals successively produced from said comparison means for producing a decision signal when the counted number of said pulsed signals equals at least a predetermined value within a predetermined time interval.
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Abstract
An electrical signal originating from an abnormal sound is passed through a bandpass filter and compared with a reference signal by a comparator. When the electrical signal is not less than the reference signal, the comparator produces a pulse. A counter counts the pulses from the comparator and causes a display device to display the presence of the abnormal sound when its count exceeds a predetermined value within a predetermined time interval.
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Citations
14 Claims
- 1. A signal decision system comprising, in combination, a detector means for detecting a signal from an object to be measured, a filter means connected to said detector means for filtering the output signal from said detector means, a comparison means connected to said filter means for comparing the output signal from said filter means with a reference signal for producing a pulsed signal when said output signal from said filter means has a level not less than a predetermined level, and a decision generation means connected to said comparison means for counting said pulsed signals successively produced from said comparison means for producing a decision signal when the counted number of said pulsed signals equals at least a predetermined value within a predetermined time interval.
- 13. A signal decision system comprising, in combination, a detector means for detecting a signal from an object to be measured, a plurality of filter means connected to said detector means, each of said plurality of filter means for filtering the output signal from said detector means, a plurality of comparison means each connected to a corresponding one of said plurality of filter means for comparing the output signal from said corresponding filter means with a reference signal to produce a pulsed signal when said output signal from said corresponding filter means has a level not less than a predetermined level, a plurality of decision generation means each connected to a corresponding one of said comparison means for counting said pulsed signals successively produced by said corresponding comparison means and for producing a decision signal when the counted number of said pulsed signals equals at least a predetermined value, and a single display means connected to all of said plurality of decision generation means to display the presence of said decision signal.
Specification