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. 24, 1984
Filed:
Sep. 21, 1981
Tadaaki Yoshinaka, Hadano, JP;
Takashi Takayama, Sagamihara, JP;
Sony Corporation, Tokyo, JP;
Abstract
A periodic pulse forming circuit, for example, for use in a video tape recording and reproducing apparatus or VTR, for distinguishing valid horizontal sync signals from noise signals in a separated horizontal sync signal train from a reproduced video signal includes a saw-tooth generator and a sample and hold circuit to produce a signal representing the interval between successive sync or noise pulses. Each sample from the sample and hold circuit is compared by a window comparator with a signal representing the average interval between successive pulses to establish whether the interval between successive pulses is within a predetermined range. If it is, the second pulse is passed by a gate but if it is not, the pulse is blocked. The noise pulse signals are thus removed. The circuit allows the reliable elimination of noise pulses even where the tape replay rate is varied for fast and slow motion reproduction.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile