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:
Apr. 15, 1986
Filed:
Nov. 13, 1984
Philip C Basile, Gloucester County, NJ (US);
RCA Corporation, Princeton, NJ (US);
Abstract
A frequency time standard monitoring system includes three highly accurate standards of substantially identical frequency. These three standards are compared in pairs by three monitoring apparatus. Each such apparatus includes a fine window detector for determining the phase relationship between the two applied frequency standard clock signals, and a phase shifter responsive to the fine window detector for shifting the phase of one of the signals until the signals are phase aligned. When this occurs, the fine window detector is disabled and a coarse window detector monitors the two clock signals to ensure that the clocks do not drift beyond tolerable limits. The output signal of the coarse window detector is applied, along with the corresponding signals from the other two monitoring apparatus, to a select logic which determines which standard should be on-line in the event of a fault detection.