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:
Oct. 26, 1976
Filed:
Nov. 01, 1974
Curtis D Munden, Anderson, IN (US);
Robert E Campbell, Anderson, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A Schmitt trigger circuit produces synchronizing signals during and of a pulse width equal to the positive half cycles of an alternating current input signal. A monostable multivibrator circuit is triggered to the alternate state by the leading edge of each synchronizing signal and the resulting series of alternate state output signals charges a capacitor to a direct current potential level range signal directly proportional to the frequency of the input signal. A direct current potential ramp timing signal generating circuit, which is reset and disenabled by the leading edge and enabled by the trailing edge of the synchronizing signals, generates a timing signal which increases linearly in potential level at a rate determined by the range signal. A potential level detector circuit responsive to the timing signal and a delay signal of a selectable direct current potential level produces an output signal when the potential level of the timing signal increases to that of the delay signal.