Comfort Noise Mode Selection via Noise Tilt Analysis
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Solution Overview
Problem
Current audio signal encoding technologies, such as AMR-WB and G.718, face limitations in comfort noise generation, particularly in accurately simulating background noise during inactive signal periods, with existing methods like LP-CNG and FD-CNG showing suboptimal performance on different noise types.
Innovation Solution
An apparatus and method that select between LP-CNG and FD-CNG comfort noise generation modes based on the background noise characteristics of an audio input signal, using a selector to determine the tilt of the noise and decide which mode to use, thereby optimizing noise quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LP-CNG method is used for comfort noise generation, then the implementation is simple and widely compatible, but the noise quality is suboptimal for certain noise types (e.g., high-tilt background noise)
Solution Approach 1:
The system dynamically selects between LP-CNG and FD-CNG methods based on the characteristics of the background noise. A selector determines the tilt of the noise and decides which mode to use, allowing the comfort noise generation approach to adapt to different noise conditions rather than using a fixed method
Solution Approach 2:
The invention changes the operational parameters of the comfort noise generation by switching between two different methods (LP-CNG and FD-CNG) depending on the noise characteristics. The selector analyzes noise parameters and adjusts the generation method accordingly to optimize quality
2Manufacturing precision
If FD-CNG method is used for comfort noise generation, then the noise quality is improved for high-tilt background noise, but the implementation complexity increases
Solution Approach 1:
The system uses a dynamic selection mechanism that chooses FD-CNG only when the noise characteristics warrant its use (high-tilt background noise). The selector analyzes the noise tilt and switches methods appropriately, avoiding the complexity of FD-CNG when LP-CNG is sufficient
Solution Approach 2:
The invention applies different comfort noise generation methods to different local conditions (noise types). FD-CNG is applied locally when high noise quality is needed for high-tilt noise, while LP-CNG is used for other cases, optimizing the balance between quality and complexity
3Device complexity
If a single comfort noise generation mode is used, then the device complexity is reduced, but the adaptability to different background noise characteristics is limited
Solution Approach 1:
The system transitions from a static single-mode approach to a dynamic multi-mode system. A selector continuously evaluates background noise characteristics and switches between LP-CNG and FD-CNG modes, enabling the system to adapt to different noise types while maintaining manageable complexity through automated selection
Solution Approach 2:
The comfort noise generation system is designed to perform multiple functions by supporting both LP-CNG and FD-CNG methods. The selector enables the system to handle different noise types (low-tilt, high-tilt, flat spectrum) with appropriate methods, making the system universally applicable to various acoustic environments
Data Source
AI summary
An apparatus for encoding audio information is provided. The apparatus for encoding audio information includes a selector for selecting a comfort noise generation mode from two or more comfort noise generation modes depending on a background noise characteristic of an audio input signal, and an encoding unit for encoding the audio information, wherein the audio information includes mode information indicating the selected comfort noise generation mode.