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. 28, 1997
Filed:
Jul. 25, 1995
Abstract
A scanning format conversion circuit for performing the mutual conversion between a progressive scanning format and a zig-zag scanning format to read or write N.times.N discrete cosine transform coefficients from or into a memory in a coding process or a decoding process of a video system. The scanning format conversion circuit comprises a pure logic circuit including an up/down counting circuit, a down counting circuit, first to third selection circuits, a comparison circuit, a phase change circuit, and an accumulation circuit. With this construction, the mutual conversion between the progressive scanning format and the zig-zag scanning format is performed on the basis of the rule between the input orders and the actual positions of the discrete cosine transform coefficients. Therefore, the scanning format conversion circuit is capable of simplifying the implementation of ASIC and performing the scanning format conversion operation regardless of a block size.