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. 13, 1996
Filed:
Mar. 11, 1994
Applicant:
Inventor:
Patrick H Casselman, Ogdensburg, NY (US);
Assignee:
Mitel, Inc., , CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03D / ;
U.S. Cl.
CPC ...
327 43 ; 327 39 ; 327 47 ; 327 49 ; 327 74 ;
Abstract
The present invention relates to a low frequency discriminator circuit comprised if apparatus for providing a rectangular wave input signal, apparatus for integrating the input signal, apparatus for detecting whether the integrated input signal falls between upper and lower thresholds respectively, and apparatus for providing an output signal indicating when the integrated input signal falls between the thresholds, whereby the frequency of the input signal may be determined to be between higher and lower limits.