PURPOSE: To add a pulse counting function to a conventional circuit by a method wherein only a new circuit is added without changing the conventional circuit.
CONSTITUTION: A signal processing circuit 12 receives a sensor signal which has been amplified by a signal amplifier 11 so as to use the sensor signal as an input signal, it operates a control circuit 14 and an oscillation circuit 13, and it outputs the input signal for a definite time. Its output signal is input to a pulse counting circuit 15, and the pulse counting circuit 15 counts the number of its output signals. In addition, simultaneously with the operation of the pulse counting circuit 15, the pulse counting circuit 15 operates a counter circuit 16 which counts the definite time. At this time, the counter circuit 16 operates the control circuit 14 and the ocillation circuit 13, and the clock signal of the counter circuit 16 is obtained.
SAKAMOTO SHINJI
TSUJIMOTO TOYOHIKO
