The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 1996
Filed:
Mar. 09, 1993
Toshiaki Yoshino, Fremont, CA (US);
Hiroyuki Nishimura, Kamakura, JP;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A digital filter, in which the operation time can be kept short even when the order of the filter is high. The digital filter comprises a first transversal filter TF.sub.1 which has an input terminal connected to a signal input terminal 10, first delay means DR.sub.1 which has an input terminal connected to the output terminal of first transversal filter TF.sub.1, a second transversal filter TF.sub.2 connected to the output terminal of the first delay means DR.sub.1, second delay means DR.sub.2 which has an input terminal connected to the output terminal of the second transversal filter TF.sub.2, adder AD which has one of the input terminals connected to the output terminal of the second delay means DR.sub.2, third delay means DR.sub.3 which has an input terminal connected to the output terminal of the adder AD and an output terminal connected to the signal output terminal, and a third transversal filter TF.sub.3 which has an input terminal connected to the output terminal of the aforementioned third delay means DR.sub.3 and an output terminal connected to the other input terminal of the aforementioned adder. In this digital filter, the chain configuration of the operator that determines the time needed for one cycle of operation is a multiplier-adder chain including one multiplier and one adder in each transversal filter. Consequently, its operation time is equal to the sum of the operation times needed by one multiplier and one adder and is unrelated to the order of each transversal filter, that is, the order of the digital filter.