Immersive Audio Rendering with Upmix and Spatial Synthesis
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Solution Overview
Problem
Current devices such as notebooks, desktop computers, and mobile phones face challenges in providing an immersive audio experience due to inadequate frequency response, improper equalization, and low spatial quality when rendering audio through speakers or headphones, particularly for cinematic and multichannel content.
Innovation Solution
The implementation of an immersive audio rendering apparatus and method that uses a combination of signal processing blocks, including audio content analysis, low-frequency extension, stereo-to-multichannel upmix, spatial synthesis, crosstalk cancellation, and multiband-range compression, to enhance audio quality and immersion, with parameters for controlling head-related transfer functions and real-time updates based on accelerometer input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If standard audio rendering is used in mobile devices, then device simplicity is maintained, but audio quality and spatial immersion deteriorate
Solution Approach 1:
The audio rendering process is divided into distinct signal processing blocks: audio content analysis, low-frequency extension, stereo-to-multichannel upmix, spatial synthesis, crosstalk cancellation, and multiband-range compression. Each block performs a specific function to progressively enhance audio quality while maintaining manageable complexity through modular processing stages.
Solution Approach 2:
The system performs audio content analysis and determines processing parameters in advance before actual audio playback. Head-related transfer functions are pre-calculated based on device orientation and accelerometer data, allowing the system to prepare optimal spatial rendering parameters before the user experiences the audio content.
2Manufacturing precision
If stereo-to-multichannel upmix is applied, then spatial quality is improved, but processing time and computational load increase
Solution Approach 1:
The system applies partial processing by selectively enhancing certain frequency bands and spatial dimensions based on the audio content characteristics. The stereo-to-multichannel upmix focuses computational resources on critical spatial rendering tasks rather than processing all audio parameters equally, reducing overall processing time while maintaining spatial quality.
Solution Approach 2:
The system dynamically adjusts processing parameters based on audio content analysis, including multiband-range compression ratios, spatial synthesis coefficients, and crosstalk cancellation parameters. These parameter changes optimize processing efficiency by adapting the computational intensity to the specific characteristics of each audio segment.
Data Source
AI summary
In some examples, immersive audio rendering may include determining whether an audio signal includes a first content format including stereo content, or a second content format including multichannel or object-based content. In response to a determination that the audio signal includes the first content format, the audio signal may be routed to a first block that includes a low-frequency extension and a stereo to multichannel upmix to generate a resulting audio signal. Alternatively, the audio signal may be routed to another low-frequency extension to generate the resulting audio signal. The audio signal may be further processed by performing spatial synthesis on the resulting audio signal, and crosstalk cancellation on the spatial synthesized audio signal. Further, multiband-range compression may be performed on the crosstalk cancelled audio signal, and an output stereo signal may be generated based on the multiband-range compressed audio signal.