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. 30, 1977
Filed:
Apr. 22, 1976
Keith Francis Walker, Woking, EN;
Data Recording Instrument Company Limited, Staines, EN;
Abstract
A waveform-level detector circuit is described for use in conjunction with waveforms showing positive and negative excursions about a neutral axis, the waveform trace crossing the axis between positive and negative peaks. Ideally, each axis crossing has significance, but the presence of noise produces spurious crossings and the circuit is arranged to accept as significant only an axis crossing which occurs in a single transition of the waveform trace between reference levels on either side of the axis. However, in detecting such a crossing, its actual timing is not accurately registered, so the apparatus also produces a timing response accurately related to all crossings, significant or not, and then combines this response with accepted crossing signals to derive a final output.