| 摘要 |
PURPOSE:To provide a digital filter in which response time can be shortened without deteriorating compensation gain characteristics in low band. CONSTITUTION:The digital filter 20 comprises an adder 21 for adding a difference signal from a frequency meter 5 to a deviation signal thus producing an addition signal. The deviation signal is produced as follows. The addition signal is delivered from the adder 21 to a subtractor 22 which subtracts an accumulation signal from the addition signal to produce a subtraction signal. The subtraction signal is passed to a register 23 and stored therein as an accumulation signal. The accumulation signal is returned back to the subtractor 22 and delivered to a multuplier 24. The multiplier 24 multiplies the accumulation signal by a coefficient K(0<K< 1) to produce the deviation signal which is returned back to the adder 21. |
