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:
Mar. 07, 1989
Filed:
Apr. 14, 1987
Shigehisa Kawabe, Tokyo, JP;
Nec Corporation, , JP;
Abstract
A noise eliminating apparatus, which may be used in a special effect system for a television video signal, removes noise from an input key signal by inhibiting signal transmission when the signal pulse width is below an arbitrary value. The noise eliminating apparatus includes an arbitrary value generator indicating a noise width to be eliminated. A pulse width detector produces a detection signal when the pulse width of the input key signal exceeds the noise width. A plurality of signal delay circuits are connected in series for sequentially delaying the input key signal. Associated with each delay circuit is a comparator for comparing a respective preselected constant value with the arbitary value and producing a respective coincident signal when such values coincide. A signal inhibitor, such as a logic AND gate, is associated with each delay circuit. The signal inhibitor inhibits the associated delay circuit from delaying the input key signal when the coincident signal is present but the detection signal is absent. With this arrangement, the input key signal following a removed noise signal is transmitted with unaffected width.