Surround Signal Rendering From Downmix Spatial Information
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Solution Overview
Problem
Current methods and apparatuses are unable to generate a surround signal with multi-channel features in environments capable only of producing mono or stereo signals, limiting the efficient processing of media signals.
Innovation Solution
A signal processing apparatus and method that utilizes spatial information to convert a media signal into a surround signal by generating source mapping information, applying filter information for a surround effect, and integrating rendering information with a downmix signal to produce a surround signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional methods are used to generate multi-channel signals, then multi-channel features can be achieved, but the method is not usable in environments capable only of producing mono or stereo signals
Solution Approach 1:
The signal processing is divided into distinct functional modules: a downmixing unit that creates downmix signals from multi-channel inputs, a spatial information generating unit that extracts spatial characteristics, and a surround signal generating unit that synthesizes surround effects. This segmentation allows the system to process signals in stages, adapting to different output environments without requiring full multi-channel processing capability at each stage.
Solution Approach 2:
The patent introduces downmix signals as an intermediary representation that preserves essential spatial information while being compatible with mono and stereo output environments. By using downmix signals as a mediator between the original multi-channel content and the limited output capability, the system can generate surround effects without requiring full multi-channel output capability.
2Reliability
If surround signals are generated using spatial information in mono/stereo-only environments, then multi-channel features can be achieved, but the processing complexity increases
Solution Approach 1:
The system performs preliminary downmixing and spatial information extraction before generating the final surround signal. By preparing downmix signals and spatial information in advance, the system reduces the computational burden during the actual surround signal generation, making the process more manageable in mono/stereo-only environments.
Solution Approach 2:
The patent dynamically adjusts processing parameters based on the output environment capabilities. When operating in mono or stereo-only environments, the system modifies how spatial information is applied to the downmix signal, changing parameters such as filter coefficients and mixing ratios to achieve surround effects with reduced computational complexity.
Data Source
AI summary
An apparatus for processing a media signal and method thereof are disclosed, by which the media signal can be converted to a surround signal by using spatial information of the media signal. The present invention provides a method of processing a signal, the method comprising of extracting a downmix signal from a bitstream; generating a decorrelated downmix signal by applying a decorrelator to the downmix signal; and generating a surround signal by applying rendering information for generating a surround signal to the downmix signal and the decorrelated downmix signal.