AR Headphone Acoustic Rendering via Reverberation Fingerprinting
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Solution Overview
Problem
Current audio signal processing technologies face challenges in providing immersive and realistic 3D audio experiences for virtual and augmented reality applications, particularly in accurately simulating local environment acoustics and blending virtual audio objects with natural sounds, which requires complex and often impractical measurement of binaural room impulse responses.
Innovation Solution
A method using a statistical reverberation model and computationally efficient data-driven reverberation rendering to create a compact 'reverberation fingerprint' that characterizes environments, allowing for natural-sounding, externalized 3D audio reproduction by matching or approximating local environment acoustics, and applying this to headphone-based audio-augmented reality systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If binaural room impulse responses are measured to accurately simulate local environment acoustics, then audio realism is improved, but system complexity and measurement practicality deteriorate
Solution Approach 1:
The patent creates a simplified copy of the room impulse response by extracting only the essential reverberation characteristics (decay time, initial level, spectral shape) rather than measuring and reproducing the complete binaural impulse response. This copying approach captures the perceptually relevant acoustic features while eliminating the complexity of full binaural measurement and reproduction systems
Solution Approach 2:
The patent extracts the key reverberation parameters (decay time, initial level, spectral characteristics) from the room impulse response and uses only these extracted features for audio processing. This extraction separates the essential acoustic information from the complex complete impulse response, enabling realistic audio simulation without requiring full binaural measurement systems
2Manufacturing precision
If binaural room impulse responses are measured to accurately simulate local environment acoustics, then audio realism is improved, but measurement practicality deteriorates
Solution Approach 1:
Instead of performing complex binaural measurements, the system creates a simplified copy of the reverberation characteristics using easily measurable parameters like decay time and spectral shape. This copying method achieves perceptually accurate results without the practical difficulties of full binaural impulse response measurement
Solution Approach 2:
The patent extracts only the necessary reverberation parameters (decay time, initial level, spectral characteristics) from the room impulse response, discarding the complex binaural spatial information. This extraction makes the measurement process practical and simple while retaining the acoustic features essential for realistic audio reproduction
3Measurement precision
If complex binaural room impulse response measurement is performed, then acoustic accuracy is improved, but computational efficiency deteriorates
Solution Approach 1:
The system creates a computationally efficient copy of the room acoustic effects by using simplified reverberation parameters rather than full binaural impulse responses. This copying approach maintains perceptual acoustic accuracy while enabling real-time processing with minimal computational resources
Solution Approach 2:
The patent extracts only the essential reverberation characteristics (decay time, initial level, spectral shape) from the room impulse response, removing the computationally intensive binaural spatial components. This extraction enables accurate acoustic simulation to be performed efficiently in real-time applications
Data Source
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AI summary
Accurate modeling of acoustic reverberation can be essential to generating and providing a realistic virtual reality or augmented reality experience for a participant. In an example, a reverberation signal for playback using headphones can be provided. The reverberation signal can correspond to a virtual sound source signal originating at a specified location in a local listener environment. Providing the reverberation signal can include, among other things, using information about a reference impulse response from a reference environment and using characteristic information about reverberation decay in a local environment of the participant. Providing the reverberation signal can further include using information about a relationship between a volume of the reference environment and a volume of the local environment of the participant.