Multichannel Audio Encoding With Adaptive Stereo Pairing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing audio encoding techniques for multichannel systems, such as 5.1 channel systems, are inefficient in coding audio signals when channels like Lf and Ls have similar audio signals, as they prescribe joint coding with Rf instead of allowing joint coding of Lf and Ls.
Innovation Solution
The proposed solution involves an encoding method that allows for flexible stereo encoding and decoding of multichannel audio systems by receiving input channels, subjecting them to multiple stereo encoding processes, and outputting encoded channels. This method enables joint coding of channels in various configurations, such as Lf and Ls, or Rf and Rs, and allows for different stereo coding schemes to be applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If joint stereo coding is performed between Lf and Rf channels, then the existing encoding approach can be maintained, but the coding efficiency deteriorates when Lf and Ls have similar audio signals
Solution Approach 1:
The patent implements dynamic channel pairing where the encoder can adaptively select different channel combinations (Lf-Rf, Lf-Ls, Rs-Rs) based on the actual audio content. The system transitions from a fixed encoding prescription to a flexible, content-adaptive approach that chooses the optimal pairing to maximize coding efficiency while maintaining spatial audio quality.
Solution Approach 2:
The patent changes the coding parameters by allowing variable channel pairings rather than fixed pairings. The encoder analyzes audio characteristics and adjusts which channels are paired together for joint stereo coding, changing the coding configuration parameter from static to dynamic based on signal similarity and spatial distribution.
2Productivity
If flexible channel pairing is allowed, then coding efficiency improves for similar audio signals, but the device complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where the encoder analyzes the audio signals from multiple channels and uses this information to determine the optimal pairing strategy. The system continuously monitors signal characteristics and adjusts channel pairings accordingly, using feedback from the audio content to simplify the decision-making process and manage system complexity.
Solution Approach 2:
The patent creates a universal encoding framework that can handle multiple channel pairing configurations through a single flexible system. Rather than requiring separate encoding paths for different channel combinations, the system uses a unified approach that can adapt to various pairing scenarios (Lf-Rf, Lf-Ls, Rs-Rs), reducing overall system complexity through multi-functionality.
3Adaptability or versatility
If multiple stereo conversions are performed, then the flexibility and efficiency of coding improves, but the processing time increases
Solution Approach 1:
The patent segments the multichannel audio processing into distinct stereo conversion units, each handling specific channel pairs independently. By dividing the complex task of processing all channels into manageable segments (Lf-Rf conversion, Lf-Ls conversion, Rs-Rs conversion), the system can efficiently manage processing time while maintaining flexibility in channel pairing choices.
Solution Approach 2:
The patent applies partial stereo conversions only when and where needed based on audio content analysis. Rather than always performing all possible stereo conversions, the system performs conversions selectively for channel pairs that have similar audio signals or require special handling, reducing unnecessary processing time while maintaining coding flexibility when beneficial.
Data Source
AI summary
Encoding and decoding devices for encoding the channels of an audio system having at least four channels are disclosed. The decoding device has a first stereo decoding component which subjects a first pair of input channels to a first stereo decoding, and a second stereo decoding component which subjects a second pair of input channels to a second stereo decoding. The results of the first and second stereo decoding components are crosswise coupled to a third and a fourth stereo decoding component which each performs stereo decoding on one channel resulting from the first stereo decoding component, and one channel resulting from the second stereo decoding component.