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. 07, 1980
Filed:
Oct. 23, 1978
Harry K Ebert, Jr, Hackettstown, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
A digital counter driven by a stable high frequency source generates a periodic signal synchronized to an external signal source. Gating circuitry responsive to particular digital counts, accumulated by the counter, defines precise quantized time intervals. The external signal is examined during these quantized time intervals for the occurrence of significant cyclic events such as zero crossing. A single occurrence of cyclic event is determined during a first time interval while successive multiple occurrences of the cyclic event are searched for during a second but smaller time interval. In each instance failure of the event searched for activates corrective circuitry to inhibit synchronous oscillation with the external signal source.