Television – Bandwidth reduction system – Data rate reduction
Patent
1995-07-25
1997-01-28
Kostak, Victor R.
Television
Bandwidth reduction system
Data rate reduction
348390, H04N 730
Patent
active
055982123
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.
REFERENCES:
patent: 5189526 (1993-02-01), Sasson
patent: 5196930 (1993-03-01), Kadono
patent: 5502491 (1996-03-01), Sugiyama
patent: 5510904 (1996-04-01), Itoi
Jang Soon H.
Kim Si J.
Moon Yong S.
Korea Telecommunication Authority
Kostak Victor R.
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