| 摘要 |
PURPOSE:To obtain a digital filter having a lag/lead filter characteristic where a polygonal point frequency is sufficiently low by connecting a multiplier and a digital LPF in parallel and adding the outputs so as to decrease the number of elements. CONSTITUTION:An input digital signal X is inputted to the multiplier 11 of a coefficient alpha, a prescribed gain characteristic causing a phase lead is provided, the input digital signal X is inputted to the digital LPF12 formed with a feedback path which has a unit delay element 16, multipliers 14, 15 and at least the unit delay element 16, the signal is subjected to moving means processing sequentially, the phase delay characteristic is provided, they are added by an adder 10 so as to attain the linear lag/lead filter characteristic. The transfer function G(Z) of the filter is represented by alpha+(1-beta)/(1-betaZ<-1>). |
