Title :
An ultra low power variable length decoder for MPEG-2 exploiting codeword distribution
Author :
Cho, SeongHwan ; Xanthopoulos, Thucydides ; Chandrakasan, Anantha P.
Author_Institution :
MIT, Cambridge, MA, USA
Abstract :
A data driven variable length decoder chip is presented which exploits the signal statistics of variable length codes to reduce power. The approach uses fine grain lookup table partitioning to reduce switched capacitance based on codeword frequency. The variable length decoder for MPEG-2 has been fabricated and consumes 530 μW at 1.35 V for a video rate of 48M DCT samples/sec using a 0.6 μm CMOS technology. More than an order magnitude of power reduction is demonstrated without performance loss compared to a conventional parallel decoding scheme with a single lookup table
Keywords :
CMOS digital integrated circuits; decoding; discrete cosine transforms; low-power electronics; table lookup; video coding; 0.6 micron; 1.35 V; 530 muW; CMOS technology; DCT; MPEG-2; codeword distribution; codeword frequency; fine grain lookup table partitioning; signal statistics; switched capacitance; ultra low power electronics; variable length decoder; video rate; CMOS technology; Capacitance; Decoding; Detectors; Frequency; Image coding; Power dissipation; Statistics; Table lookup; Throughput;
Conference_Titel :
Custom Integrated Circuits Conference, 1998. Proceedings of the IEEE 1998
Conference_Location :
Santa Clara, CA
Print_ISBN :
0-7803-4292-5
DOI :
10.1109/CICC.1998.694957
