PULSE GENERATOR

PURPOSE:To shorten the prescribed time required for accelerating and decelerating before and after the constant speed drive by reading out a curve stored previously in a memory, and varying the control pulse on the basis of the read out value. CONSTITUTION:A memory 5 for storing the prescribed numeral value corresponding to the frequency of a control pulse in the address corresponding to the counted value 4 of the output pulse of local oscillators 2, 3, a D/A converter 6 for converting it on the basis of the output of the memory, an amplifier 7 and a V/F converter 9 for varying the frequency of a control pulse are provided. The prescribed numeral value stored in the memory is reduced in the rate of variation in the address corresponding to that before or after the end of acceleration of a motor and before and after the start of deceleration.