Pillsbury Madison & Sutro, LLP
Matched filter
 The present invention provides a matched filter which can refresh an entire while keeping the speed of a calculation comparable to a small sized circuit. The first and second addition circuits of a matched filter of the present invention are classified into a plurality of groups, the first and second auxiliary adders replace functions for the groups of the first and second adders respectively. The outputs of the first and second adders are then inputted to the first and second subtractors, respectively, and the refreshing means appropriately refreshes the groups replaced by the first and second auxiliary adders. Further, the present invention decreases the number of auxiliary sapling and holding circuits to be used, and decides the refreshing intervals by considering the change of the voltage caused by leakage and other permissible errors of output voltage. 
Sharp Kabushiki Kaisha Yozan Inc.
H H
H03H H03H
inventional inventional
Xiaoling Guoliang Changming Jie Kunihiko
Qin Shou Zhou Chen Suzuki