| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a detector for detecting a shut-off frequency of a pulse signal exceeding preset maximum specified speed and method thereof.SOLUTION: The detector detects shut-off frequency when the frequency of a pulse signal as a processing target exceeds a preset maximum specified speed due to various reasons such as noises, system design error to facilitate taking appropriate measures. The detector includes: an input processing section that, when a first pulse signal as a monitoring target pulse signal is input, generates a second pulse signal at a point when a rising edge and a falling edge of an input first pulse signal appear; a counter that counts a clock signal for the second pulse signal generated by the input processing section; a reset processing section that resets the counter every preset period; and a detection section that, when the output value of the counter in a preset period exceeds a preset threshold value, generates and outputs a shut-off frequency detection signal.</p> |
