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:
Aug. 07, 1990
Filed:
Aug. 08, 1986
Applicant:
Inventor:
Nigel P Dyer, Chiswick, GB;
Assignee:
Plessey Overseas Limited, Ilford Essex, GB;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
36472407 ;
Abstract
A low frequency digital notch filter comprising two sub-filters - an all-pass-network filter (1) and a T-section filter (3) with a feedback connection from the T-filter to an input node (31), and feed forward connection from this input node to a terminal output node (33). The all-pass-network filter (1) has a transform function: