VLC Bitstream Decoding with 2D Lookup Table Indexing
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Solution Overview
Problem
Modern information handling systems face memory and processor time constraints due to the complexity of variable-length code (VLC) bitstream data, leading to increased memory usage and reduced operating frequency, especially with large lookup tables required for decoding.
Innovation Solution
A method involving the generation and use of a leading zero count (N) and bit-length possibility (P) indexed VLC lookup table allows for real-time decoding of VLC bitstream codewords, reducing memory requirements and processor load by sorting and indexing codewords efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional VLC decoding methods with lookup tables are used, then decoding capability is provided, but memory usage increases and processor operating frequency decreases
Solution Approach 1:
The patent segments the VLC decoding process into multiple stages: initial bit reading, leading zero count determination, table selection based on bit-length possibilities, and final symbol decoding. This segmentation allows the system to use smaller, specialized lookup tables for each stage rather than one large comprehensive table, thereby reducing overall memory usage while maintaining full decoding capability.
Solution Approach 2:
The patent introduces a new dimension to the lookup table structure by organizing tables according to bit-length possibilities (P values) rather than traditional single-dimension indexing. This multi-dimensional organization allows the system to select appropriate table sizes based on the specific bit-length characteristics of the input data, optimizing memory usage for different decoding scenarios.
2Measurement precision
If larger lookup tables are used to handle complex VLC bitstream data, then decoding accuracy is improved, but processor operating frequency is reduced
Solution Approach 1:
The patent performs preliminary actions by pre-calculating and storing only the essential decoding information in the lookup tables - specifically the leading zero counts and bit-length possibilities. This preliminary organization of data allows the processor to perform accurate decoding using smaller tables, avoiding the need for larger tables that would slow down processing while maintaining decoding precision.
Solution Approach 2:
The patent applies local quality by creating specialized lookup tables with different characteristics for different stages of decoding. Each table is optimized for its specific purpose (e.g., one table for leading zero counts, another for bit-length possibilities), allowing high decoding accuracy in each local stage without requiring the entire system to use large tables, thus maintaining high processor operating frequency.
3Adaptability or versatility
If software algorithms are used to decode VLC bitstream codeword data, then flexibility is maintained, but processor time increases
Solution Approach 1:
The patent introduces dynamic table selection based on the bit-length possibilities (P values) of the input data. The system dynamically chooses which lookup table to use based on the characteristics of the current bitstream segment, allowing flexible adaptation to different VLC encoding schemes while maintaining fast processing speeds through pre-computed table lookups rather than pure software algorithms.
Solution Approach 2:
The patent introduces lookup tables as intermediary structures between the input bitstream and the final decoded symbols. These intermediary tables pre-store the results of complex decoding calculations, allowing the system to maintain software flexibility while dramatically reducing processor time by replacing complex algorithms with simple table lookups.
Data Source
AI summary
An information handling system includes a processor that may perform decoding of a variable-length code (VLC) bitstream after preprocessing the bitstream. The bitstream includes multiple VLC symbols as binary codewords. The processor analyzes incoming VLC bitstream information and generates VLC codeword symbol information in conformance with a VLC lookup table. The processor may access a 2 dimensional VLC lookup table in real time or on-the-fly. The VLC lookup table may reside in a system memory of the IHS. The single VLC lookup table may exhibit two dimensional indexing by leading zero count and bit-length possibility.