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. 21, 1987
Filed:
Apr. 08, 1985
Atma Heerah, Cambridge, GB;
U.S. Philips Corporation, New York, NY (US);
Abstract
A video signal processing apparatus comprises an input (1) for receiving an input video signal and an output (2) at which the processed signal is produced. The apparatus includes a vertical filter (3), a horizontal filter (4), a vertical interpolator (5) a horizontal interpolator (6), and a field store (7) arranged in cascade. The cut-off frequencies of the vertical and horizontal filters (3,4) are adjustable by means of signals passed over paths (18 and 19) from the control circuit (8) to the filters (3,4). A control apparatus comprising a potentiometer (25), a switch (23), and an analogue to digital converter (26) produces signals which are passed over a path (24) to the control circuit (8). These signals are used to cause the control circuit (8) to produce signals over paths (18,19) to the filters (3,4) which reduce the cut-off frequencies of the filters to a value which is below that appropriate to the picture size. This produces a soft focus effect.