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:
Jul. 07, 1987
Filed:
Oct. 07, 1985
Applicant:
Inventor:
Jerald L Bauck, Urbana, IL (US);
Assignee:
Motorola Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 / ; 324 / ; 324 / ;
Abstract
The purpose of the disclosed structure is to extract features from the emissions of quasi-periodic signal sources, such as piston engine powered vehicles and the like, after which pattern classification can proceed by any of a number of known methods. The structure consists of a phase locked loop, a bank of discrete-time filters, and a microcomputer. The filter bank is tuned by changing the clock rates, which are derived from the phase locked loop, which is locked to the signal fundamental frequency. The microcomputer is used to acquire the fundamental frequency and the filter tuning is such that each filter tracks a single harmonic.