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:
Oct. 01, 1991
Filed:
Oct. 11, 1988
Keith Lucas, Oak Ridges, CA;
Scientific-Atlanta, Inc., Atlanta, GA (US);
Abstract
A method for encoding a high definition television signal comprising a first frequency spectrum portion for standard resolution and a second high frequency spectrum portion for high resolution consistent with the B-MAC composite signal format comprises the steps or orthogonally sampling the high definition signal, diagonally filtering diagonal resolution information, and decimating alternate samples of alternate lines for folding in high frequency horizontal resolution information by means of a skew-symmetric low-pass filter. A method at a standard television resolution receiver for decoding the high-definition television signal uses a simple low pass filter to recover the baseband television spectrum at standard television resolution. A method at a high-definition television receiver comprises the steps of unfolding the high frequency horizontal resolution information and thereafter line doubling the unfolded high frequency resolution informtion to improve vertical resolution of the high-definition television signal. Thus, the encoding method is compatible for reception at either a standard resolution or high-definition television receiver.