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:
May. 30, 1995
Filed:
Feb. 01, 1994
Applicant:
Inventor:
Katsutoshi Matsuoka, Kanagawa, JP;
Assignee:
NSK Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ; G01R / ;
U.S. Cl.
CPC ...
324 7621 ; 324 7624 ; 324 7638 ; 324 7647 ; 324 7628 ; 364576 ; 364577 ;
Abstract
A frequency spectrum analyzer wherein an input signal is subjected to A/D conversion, and the converted data is multiplied by a window function; and the thus processed signal is subjected to Discrete Fourier Transform; when a user specifies a desired frequency, the square root of the sum of the squares of amplitudes of a predetermined number m of spectral lines close to the frequency is calculated; and the calculated value is outputted as a Root-Mean-Square value (RMS) of the amplitude of the spectrum of the frequency.