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:
Sep. 26, 2000
Filed:
Apr. 29, 1998
Renato Kresch, Haifa, IL;
Neri Merhav, Haifa, IL;
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
An explicit DST-based filter that comprises a trigonometric transform module, first and second transform coefficient processors (TCPs), an inverse trigonometric transform module and first and second summing arrangements. The trigonometric transform module applies a trigonometric transform to blocks of DCT coefficients related to input blocks of DCT coefficients to generate corresponding input blocks of transform coefficients of a second type ('second coefficients'). The first TCP includes matrix multipliers that generate a multiplied block of DCT coefficients and a multiplied block of second coefficients by multiplying, by diagonal multiplying matrices, intermediate blocks of DCT coefficients derived from the input blocks of DCT coefficients. The second TCP includes matrix multipliers that generate at a multiplied block of DCT coefficients and a multiplied block of second coefficients by multiplying, by diagonal multiplying matrices, intermediate blocks of second coefficients derived from the input blocks of second coefficients. The first summing arrangement sums the multiplied blocks of DCT coefficients to generate a first final block of DCT coefficients, and sums the multiplied blocks of second coefficients to generate a first final block of second coefficients. The inverse trigonometric transform module applies an inverse trigonometric transform to the first final block of second coefficients to generate a second final block of DCT coefficients. The second summing arrangement sums the first and second final blocks of DCT coefficients to generate a block of DCT coefficients constituting a block of a filtered information signal.