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, 1982
Filed:
Jul. 10, 1980
James S Congdon, Santa Clara, CA (US);
Cherry Semiconductor Corporation, Cranston, RI (US);
Abstract
Method and circuitry for generating signals in response to an input signal whose frequency or pulse rate is to be measured, which signals are directly applicable to the coils of an air core type meter movement or the like to provide an output indication of the frequency or pulse rate of the input signal. The signals applied to the air core meter are generated directly from the input signal and include sine and cosine signals synchronous with the input signal. A preferred embodiment is disclosed which includes circuitry which produces staircase waveforms, which when integrated, produce the required sine and cosine signals to drive an air core meter movement in response to a periodic input signal.