Multimedia Codec Dual Bitstream Segmentation
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Solution Overview
Problem
Existing multimedia signal reproduction technologies face challenges in achieving higher quality reproduction while minimizing data transfer costs and packet drop rates, as higher quality often requires more data bits, which can be undesirable due to bandwidth limitations and high transfer costs.
Innovation Solution
The generation of two bitstreams for multimedia signals, where the first bitstream ensures base quality reproduction with guaranteed QoS and the second bitstream enhances quality when bandwidth is available, allowing for backward compatibility with standard-compliant codecs and using techniques like extrapolation to generate the second bitstream when not received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If higher quality reproduction is achieved by increasing data bits, then reproduction quality is improved, but data transfer cost and packet drop rate increase
Solution Approach 1:
The patent segments the bit stream into multiple layers: a base layer providing standard quality reproduction and enhancement layers providing quality improvement. This segmentation allows receivers to decode only the base layer when bandwidth is limited, or add enhancement layers when bandwidth is available, thus resolving the contradiction between reproduction quality and data transfer cost by enabling adaptive quality levels.
Solution Approach 2:
The patent implements dynamic adaptation where the receiver adjusts the amount of data processed based on available bandwidth and network conditions. When bandwidth is sufficient, enhancement layers are decoded to provide high quality; when bandwidth is limited, only the base layer is decoded to minimize data transfer cost while maintaining acceptable quality. This dynamic adjustment resolves the contradiction between fixed quality requirements and variable transfer costs.
2Measurement precision
If higher quality reproduction is achieved by increasing data bits, then reproduction quality is improved, but packet drop rate increases
Solution Approach 1:
The patent segments the bit stream into a base layer and enhancement layers. The base layer is designed to be self-contained and robust, ensuring reliable reproduction even when packets are dropped. Enhancement layers provide quality improvement but are optional. This segmentation resolves the contradiction by ensuring that packet drops affect only the enhancement quality, not the fundamental reproduction quality.
Solution Approach 2:
The patent provides beforehand cushioning by ensuring the base layer contains sufficient information for acceptable reproduction quality even without enhancement layers. This cushioning protects against packet drops by guaranteeing that the core reproduction function remains reliable even when enhancement packets are lost, thus resolving the contradiction between追求 high quality and maintaining reliability.
3Adaptability or versatility
If standard-compliant codecs are used, then compatibility is maintained, but reproduction quality is limited to fixed levels
Solution Approach 1:
The patent implements universality by designing a codec that can function in multiple modes: it can operate as a standard-compliant codec for basic compatibility, or as an enhanced codec when bandwidth is available. The base layer ensures compatibility with standard receivers, while enhancement layers provide additional quality for capable receivers. This multi-functionality resolves the contradiction between maintaining compatibility and achieving higher quality.
Solution Approach 2:
The patent segments the bit stream into a standard-compliant base layer and optional enhancement layers. Standard receivers can decode only the base layer, ensuring compatibility. Advanced receivers can decode both base and enhancement layers for higher quality. This segmentation allows the system to simultaneously achieve compatibility and enhanced quality without compromising either objective.
Data Source
AI summary
According to an aspect of the present invention two streams data encoding corresponding information contained in a multimedia signal are generated with one bitstream (“first stream”) providing for reproduction of the information with a base quality (e.g., according to a corresponding standard), and the second bitstream (“second stream”) containing information which can be used to further enhance the quality of reproduction.