PURPOSE: To allow one system to process a processing program of a reply signal by using a modulation circuit to modulate a signal into a reply signal suitable for the processing program in inputting the reply signal not suited to the processing program.
CONSTITUTION: When the reply signal 1 is a long/short pulse, a CPU 1 uses a switching signal 4 to throw an analog switch 3 to the position (a). When the signal 1 is of changing point type, the signal 4 throws the switch 3 to the position of (b) so as to release the reset of the modulation circuit 4. Then the changing point type pulse of the signal 1 is subject to 1/2 frequency division by the modulation circuit 4 so as to change the signal into a long/short pulse of the signal 3 to form a signal 5, and the long/short pulse possible for processing by the CPU 1 is recovered. Thus, in the processing program system using either the changing point type or the long/short pulse type, both types of the reply signal are processed, the program capacity is halved and the complicated program is reduced.
SUZUKI YOSHIHARU
KOMODA YOSHIYUKI
