Coded data generation or conversion – Digital code to digital code converters – To or from variable length codes
Patent
1992-12-18
1994-08-30
Hoff, Marc S.
Coded data generation or conversion
Digital code to digital code converters
To or from variable length codes
341106, H03M 740
Patent
active
053431952
ABSTRACT:
A variable length decoder including the cascade combination of a buffer memory for providing parallel-bit coded data in N-bit bytes, and a first barrel shifter having an R-bit input port and an R-bit output port (R>N). The R-bit output port of the first barrel shifter is coupled to respective first inputs of a bank of R two-input OR gates. The outputs of the OR gates are coupled to the parallel input of a register or latch, the output of which is coupled to the address input port of a lookup table for providing decoded versions of variable length codewords applied to its address port, and providing indicia which indicates the length of respective decoded variable length codewords. The output of the register is also coupled to the input of a second R-bit input R-bit output second barrel shifter. The output of the second barrel shifter is coupled to respective second input connections of said bank of OR gates. The indicia provided by the lookup table are applied to a Shift State Machine, which generates control signals to control the respective bit shift operations of the first and second barrel shifters. The combination of barrel shifters and the OR circuit provide for rapid application of successive variable length codewords to the lookup table.
REFERENCES:
patent: 4334246 (1982-06-01), Saran
patent: 4396906 (1983-08-01), Weaver
patent: 4568916 (1986-02-01), Bahgat
patent: 4569058 (1986-02-01), Grallert
patent: 4593267 (1986-06-01), Kuroda et al.
patent: 4647908 (1987-03-01), Ross et al.
patent: 4651194 (1987-03-01), Grallert
patent: 4675652 (1987-06-01), Machado
patent: 4899149 (1990-02-01), Kahan
patent: 4922510 (1990-05-01), Brusewitz
patent: 4937573 (1990-06-01), Silvio et al.
patent: 4963867 (1990-10-01), Bertrand
patent: 4967196 (1990-10-01), Sprague et al.
patent: 5162795 (1992-11-01), Shirota
patent: 5245338 (1993-09-01), Sun
An Entropy Coding System for Digital HDTV Applications by Shaw-Min Lei et al., IEEE Transactions on Circuits and Systems for Video Technology, vol. 1, No. 1, Mar. 1991.
A High-Performance Full-Motion Video Compression Chip Set, by Peter A. Ruetz et al., IEEE Transactions on Circuits and Systems for Video Technology, vol. 2, No. 2, Jun. 1992, pp. 111-121.
Designing a High-Throughput VLC Decoder Part II-Parallel Decoding Methods by Horing-Dar Lin, IEEE Transactions on Circuits and Systems for Video Technology, vol. 2, No. 2, Jun. 1992, pp. 197-206.
Herrman Eric P.
Hoff Marc S.
Kurdyla Ronald H.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
LandOfFree
Variable length codeword decoding apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable length codeword decoding apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable length codeword decoding apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-32349