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:
Jan. 18, 1994
Filed:
Nov. 15, 1991
John L Baldwin, Eastleigh, GB;
Rank Cintel Limited, , GB;
Abstract
A sampled input signal, e.g. a video signal, is processed to provide output signals appropriate for positions between input samples by interpolating between the input samples using an interpolating transversal filter (110) and filtering the interpolated signal with a second filter (150) the gain of which increases with increasing frequency. The coefficients of the interpolating transversal filter are chosen so as simultaneously to compensate the frequency response of the second filter and to provide a desired position offset of the output samples with respect to the input samples. The interpolation and filtering steps may be reversed in order. Surprisingly the interpolation is improved in quality when it incorporates a de-emphasis operation in this way. The sampling may be the sampling achieved by the video signal line structure. A non-linear circuit (140) such as a gamma corrector may be interposed between the interpolator and the equalizer. The system can in particular be used to process the video output of a telecine, or to process digital audio signals.