Coded data generation or conversion – Digital code to digital code converters – To or from bit count codes
Patent
1993-10-25
1995-01-10
Hoff, Marc S.
Coded data generation or conversion
Digital code to digital code converters
To or from bit count codes
341 67, H03M 746
Patent
active
053811445
ABSTRACT:
A versatile escape run-level coder for use in a digital video signal processing apparatus which produces a run-level data and an escape prefix code carrying escape code and escape code length data. A selection logic detects the level of the level data in the run-level data. When the level is detected as in a mid range, three selectors select short length data, data from the code extender 13 which inserts meaningless 8-bit code, and data from code concatenator 1, respectively. The selected data are concatenated in a second code concatenator for forming a tailor made code which is 36-bit long, but the effective data length is, for example, 20 bits. When the level is detected as in a range above or below the mid range, the three selectors select long length data, data from the line carrying ESC code and data from either one of the two level coders, respectively. The selected data are concatenated in the second code concatenator for forming a tailor made code which is 36-bit long, but the effective data length is, for example, 28 bits.
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CD 11172-1 "Coding of Moving Pictures and Associated Audio for Digital Storage Media at up to about 1.5Mbps", the International Organization for Standardization, ISO MPEG Document, ISO-IEX/JTC1/SC2/WG8, 1992.
"Matsushita Algorithm for Coding of Moving Picture Information" (Proposal Description for MPEG-II), by International Organization for Standardization, ISO/IEC-JTC1/SC29/WG11, MPEG91/217, Nov. 13, 1991.
Lim Sau-Tsien
Wilson William B.
Hoff Marc S.
Matsushita Electric - Industrial Co., Ltd.
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