发明名称 |
VARIABLE LENGTH DECODER FOR DECODING DIGITALLY ENCODED VIDEO SIGNALS |
摘要 |
A variable length decoder (VLD) for decoding MPEG-1 and -2 syntax compliant video bit streams. The VLD includes a micro-sequencer and VLD command decode/execution unit for controlling the MPEG decoding process using a novel instruction set. The instruction set includes a set of commands for decoding the video data and a set of flow control instructions. A rotator/barrel shifter is provided for making a predetermined number of encoded bits from the video bit stream available to the VLD and a variable length table decoder for variable length decoding using the MPEG standard variable length code (VLC) tables. The variable length table decoder shares a prefix pattern matching scheme across all of the VLC tables and organizes the variable length codes into a series of subtables. Each subtable corresponds to one of the unique prefix patterns. Variable length codes are decoded by identifying a leading pattern in the video data bit stream and, in parallel, accessing the subtable corresponding to that leading pattern. Run-length and amplitude level DCT coefficient symbols are stored in compressed form, and decoded as needed by an inverse transform unit. Motion vectors are also stored until needed by a motion compensation unit.
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申请公布号 |
US2003043917(A1) |
申请公布日期 |
2003.03.06 |
申请号 |
US19990280437 |
申请日期 |
1999.03.29 |
申请人 |
BUBLIL MOSHE;BOSE SUBROTO;GADRE SHIRISH C.;HONG JOHN;OZCELIK TANER |
发明人 |
BUBLIL MOSHE;BOSE SUBROTO;GADRE SHIRISH C.;HONG JOHN;OZCELIK TANER |
分类号 |
G06T9/00;H03M7/42;H04N7/26;H04N7/30;H04N7/50;(IPC1-7):H04N7/12 |
主分类号 |
G06T9/00 |
代理机构 |
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代理人 |
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地址 |
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