Circuit for converting a frequency of an input signal so a signal having a digital value corresponding to the frequency
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United States of America Patent
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Oct 18, 1994
Grant Date -
N/A
app pub date -
Jul 30, 1992
filing date -
Aug 6, 1991
priority date (Note) -
Expired
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Abstract
A measuring circuit with a simple circuit configuration is capable of correcting dispersion of a characteristic of a display apparatus and of displaying the measurement result. The measuring circuit comprises an edge detecting circuit, for outputting an edge detection signal synchronous with clock pulses by performing sampling on an input signal, the sampling being performed using clock pulses having a frequency higher than a frequency of the input signal, a gate circuit outputting a first factor when receiving the edge detection signal from the edge detection circuit, a digital integrating filter circuit for outputting a signal having digital values converging to values corresponding to the frequency of the input signal by timing sampling operation based on cycles of the clock pulses.
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