Television – Bandwidth reduction system – Data rate reduction
Patent
1996-08-05
1998-05-19
Au, Amelia
Television
Bandwidth reduction system
Data rate reduction
382246, 382245, 3582614, H04N 730, G06K 936
Patent
active
057542325
ABSTRACT:
A zig-zag and alternate scan conversion circuit for encoding/decoding videos which is structured only by logic circuits using a regularity of scan address patterns, thereby achieving an improvement in processing speed and a reduction in area. The circuit includes a zig-zag and alternate scan address generating unit for receiving a start signal, a basic operation clock signal, and a control signal indicative of whether the scan pattern of input data is a zig-zag scan pattern or an alternate scan pattern, and executing an operation for writing the input data on a RAM and reading them from the RAM based on the received signals, a raster address generating unit for receiving the same signals as those received in the zig-zag and alternate scan address generating unit and executing a writing/reading operation of the input data, a pair of multiplexor units each for appropriately selecting an address signal from the address generating units; and a latch unit for outputting address signals selected from the multiplexor units while controlling the timing of the address signals. The circuit can be applied to systems requiring high-speed data processing such as B-ISDN terminals and high definition televisions. The circuit can also be easily used in systems including circuits designed in the form of a VLSI which will be used as an application-specific integrated circuit (ASIC).
REFERENCES:
patent: 5367629 (1994-11-01), Chu et al.
patent: 5555321 (1996-09-01), Ogura et al.
patent: 5627917 (1997-05-01), Chen
Kim Kyeoun Soo
Kim Si Joong
Au Amelia
Korea Telecommunication Authority
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