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. 18, 1992
Filed:
Jan. 10, 1991
Applicant:
Inventor:
Kojiro Hara, Edogawa-ku, Tokyo, 134, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
324 / ; 324617 ; 329312 ; 341 53 ; 377 20 ;
Abstract
A PWM signal demodulation method measuring the leading edge period of a modulated signal and a time between adjoining leading and trailing edges of the signal and finding the modulation factor in terms of the ratio of the period to the time. Reliable demodulation is ensured even if the carrier frequency of the modulated signal varies significantly. This novel method eliminates one disadvantage of the prior art demodulation method encountered when a varying carrier frequency exceeds the linearity domain of an integrator in its integrating characteristic, causing unreliable demodulation.