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:
Jul. 07, 1987
Filed:
Sep. 06, 1985
Dennis J Bashford, Horsham, GB;
Geoffrey H Blackham, Horsham, GB;
Abstract
A field blanking pulse modifier in which the line synchronizing pulses and the field blanking pulse of a conventional television signal are derived. A counter is arranged to be reset by the field blanking pulse and to count the detected line synchronizing pulses or multiples thereof. An offset count is set corresponding to half the desired difference in duration between the modified field blanking pulse to be generated and the field blanking pulse of the television signal. The generation of the modified field blanking pulse is initiated when the sum of the counter content and the offset count is equal to the counter content which results after the counting of all the line synchronizing pulses between two successive field blanking pulses of the television signal, and the generation of the modified field blanking pulse is terminated when the counter content is equal to the offset count. With this arrangement the lines of the television picture which are blanked out are symmetrically positioned about the center of the scan and the required relationship between the fields of a frame can be accurately maintained to ensure correct interlacing.