| 摘要 |
PURPOSE:To obtain a large amplification factor through a noncyclic filter which has a small number of delay stages to be suitably applied to a high speed operation, by installing four noncyclic filters having a set specific weight coefficient plus an adder to obtain the output sum of these four filters. CONSTITUTION:The 1st-4th noncyclic filters 30A, 40A, 30B and 40B ase set with the weight coefficients Wk and Hk (k=1,2-N). The values of the coefficients Wk and Hk are set so that the output sum of filters 30A and 40B shows a large value when the pulse series WN-W2, W1 plus HN-H2, H1 having an opposite time axis to the impulse response of the 1st and 3rd filters 30A and 30B are all supplied to the filters 30A and 30B and then shows a small value otherwise respectively. Furthermore adders 6, 25 and 26 are provided to obtain the output sum of the filters 30A-40B. For instance, a circuit including a delay stage 3, a multiplier 5 and others as shown in the diagram is used to constitute the above-mentioned SI/PO type noncyclic filter. |
