Scalable Stereo Signal Encoding via Adaptive Monaural Mode Selection
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Solution Overview
Problem
Conventional stereo signal coding apparatuses do not effectively utilize the correlation between left and right channel signals and the significance of information for scalable coding, and they lack the ability to set layers for monaural and stereo coding based on user operations.
Innovation Solution
A stereo signal coding apparatus that generates monaural and side signals from left and right channel signals, and sets coding modes for each layer using mode information to perform scalable coding, allowing for monaural or stereo coding based on the correlation and significance of the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional stereo signal coding apparatuses switch between left and right channel signals according to a predetermined rule, then the coding process is simple, but the coding accuracy and adaptability to signal correlation are poor
Solution Approach 1:
The patent implements dynamic coding mode selection where the system can switch between monaural coding mode and stereo coding mode based on the correlation characteristics of the input signal. The mode determination unit analyzes the correlation between left and right channel signals and automatically selects the appropriate coding mode, making the coding process adaptive rather than fixed. This resolves the contradiction by introducing dynamic behavior that improves accuracy without requiring overly complex predetermined switching rules.
Solution Approach 2:
The patent changes the coding parameters (coding mode) based on the correlation parameter between left and right channel signals. When the correlation is high, the system switches to monaural coding mode with reduced parameters; when correlation is low, it uses stereo coding mode with full parameters. This parameter adaptation allows the system to maintain high coding accuracy while adjusting complexity based on signal characteristics.
2Adaptability or versatility
If scalable coding is implemented with multiple layers, then the adaptability and quality control are improved, but the device complexity and configuration difficulty increase
Solution Approach 1:
The patent segments the coding system into multiple independent layers (core layer and enhancement layers), where each layer can be configured and processed separately. The mode information is also segmented into layer-specific settings, allowing different coding modes to be applied to different layers. This segmentation enables scalable coding adaptability while managing complexity through modular architecture.
Solution Approach 2:
The patent creates a universal coding apparatus that can handle multiple coding modes (monaural and stereo) across multiple layers through a single integrated system. The mode determination unit and coding unit are designed to work universally across all layers, reducing the need for separate specialized components for each layer and mode combination. This multi-functionality improves adaptability while controlling device complexity.
3Ease of operation
If monaural and stereo coding layers are set by user operations, then the control flexibility is improved, but the ease of operation and automatic adaptation are reduced
Solution Approach 1:
The patent implements self-service functionality where the mode determination unit automatically determines the appropriate coding mode based on the correlation characteristics of the input signal without requiring user intervention. The system analyzes the signal correlation and autonomously selects between monaural and stereo coding modes, as well as determines the appropriate layer configuration. This automatic adaptation improves ease of operation while maintaining full adaptability through intelligent decision-making algorithms.
Data Source
AI summary
A technique of improving the degree of freedom of controlling the accuracy of encoding a stereo signal. In a stereo signal encoding device, a sum/difference calculation section generates a monophonic signal which is the sum of first and second channel signals constituting a stereo signal and a side signal which is the difference between the first channel signal and the second channel signal. A mode setting section generates mode information that indicates either a monophonic encoding mode or a stereo encoding mode. A core layer encoding section, a first extended layer encoding section, a second extended layer encoding section, and a third extended layer encoding section individually carry out the monophonic encoding using the monophonic signals or the stereo encoding using both the monophonic signal and the side signal depending on the mode information, and output to a multiplexing section the resultant encoded information from the core layer to the third extended layer.