| 摘要 |
PURPOSE:To improve an S/N and to obtain a large degree of freedom of frequency characteristic by adopting the constitution of stable inverse filter having lots of parameters and introducing a nonlinear circuit to an edge processing section. CONSTITUTION:A unit delay element 1 receives an input or output signal and retards the reception signal by a unit time and delay elements 2, 3 retard the signal by an integral number of mutliple. A subtractor 4 subtracts output signals of delay elements 1-3 from the reception signal. A cascade connection circuit connecting at least a coefficient circuit 5 to the edge detection circuit is provided as plural numbers. Then each output signal of each cascade connection circuit is added by an adder 11. Thus, the stable inverse filter is constituted while having lots of dispersion to obtain a large degree of freedom of frequency characteristic. |
