VLC Bitstream Preprocessing With 2D Lookup Table Decoding
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Solution Overview
Problem
Modern information handling systems face memory resource constraints and processor speed degradation due to the complexity of variable-length code (VLC) bitstream decoding, which increases memory usage and processing time, especially with large lookup tables.
Innovation Solution
A processor generates a 2-dimensional leading zero count (N) and bit-length possibility (P) indexed VLC lookup table to efficiently decode VLC bitstream data, reducing memory usage and improving processing speed by sorting codewords and using the lookup table for real-time decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional VLC decoding methods with lookup tables are used, then decoding accuracy is maintained, but memory usage increases and processor speed degrades
Solution Approach 1:
The patent segments the VLC decoding process into two distinct phases: a preprocessing phase that generates optimization data structures (leading zero count arrays, bit-length possibility arrays, and sorted codeword lists) and a runtime decoding phase that uses these pre-computed structures. This segmentation allows complex decoding logic to be prepared beforehand, enabling faster execution during actual bitstream processing without requiring large lookup tables in memory during runtime.
Solution Approach 2:
The patent performs preliminary actions by pre-computing and storing optimization data structures before actual VLC decoding operations. The leading zero count arrays, bit-length possibility arrays, and sorted codeword lists are generated in advance based on the specific VLC table being used. This preliminary preparation eliminates the need for complex runtime computations and large lookup tables, directly improving processing speed while reducing memory requirements during the actual decoding process.
2Adaptability or versatility
If VLC bitstream complexity increases, then decoding capability improves, but memory requirements and processing time increase
Solution Approach 1:
The patent applies local quality by creating specialized data structures optimized for specific VLC table characteristics. The leading zero count arrays and bit-length possibility arrays are tailored to the specific VLC encoding scheme being used, providing locally optimized decoding paths for different bitstream complexities. This allows the system to handle diverse VLC formats efficiently without requiring a universally complex decoding mechanism.
Solution Approach 2:
The patent changes key parameters of the decoding process by using leading zero count as an indexing mechanism and organizing codewords by bit-length. These parameter changes transform the decoding approach from generic table lookup to a structured, parameter-driven process that adapts to different VLC complexities. The sorted codeword lists and bit-length organization enable the system to handle varying bitstream complexities efficiently through parameter-based optimization rather than increased structural complexity.
Data Source
AI summary
An information handling system includes a processor that may perform preprocessing on a variable-length code (VLC) bitstream before decoding the bitstream. The bitstream includes multiple codewords. The processor analyzes incoming VLC bitstream information and generates codeword table information for storage in a system memory or a VLC codeword tables location. The processor generates a VLC lookup table from the information in the VLC codeword tables and stores that VLC lookup table in a system memory of the IHS. The VLC lookup table may exhibit two dimensional indexing by leading zero count and bit-length possibility.