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:
Sep. 05, 1989
Filed:
Aug. 08, 1986
Nigel P Dyer, London, GB;
Plessey Overseas Limited, Ilford, GB;
Abstract
An interpolator or decimator filter structure operable between two sampling rates (F.sub.s and 2F.sub.2), and in which two branches (21 and 23) of the structure are divided into low and high frequency sections by sampling switches (27 and 29). The high frequency section of one branch (21) incorporates a composite filter comprises of a nesting filter (1') and a nested filter 1. Each of these filters 1, 1' includes a digital coefficient multiplier (5,5'). The coefficient (K.sub.2) of the coefficient multiplier (5), part of the nested filter (1), is preset to a value such that 3 dB attenuation occurs at a point offset in frequency from one-half the lower sampling rate (F.sub.s).