Room Impulse Response Generation via HRIR Truncation
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Solution Overview
Problem
Current multi-channel audio processing techniques face challenges in efficiently generating artificial room impulse responses due to high computational complexity and spectral coloration issues, particularly in simulating realistic sound environments with long filters and cross-talk cancellation requirements.
Innovation Solution
The method involves modifying artificial room impulse responses by adjusting individual head-related impulse responses (HRIRs) before superposition, omitting large-delay contra-lateral portions, truncating middle sections, and using Fourier transforms with simplified zero-padding for overlap-add methods, while maintaining the original temporal structure and spectral characteristics to reduce computational complexity and avoid phase disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods superimpose multiple HRIRs with reflections to generate room impulse response, then realistic sound environment simulation is achieved, but computational complexity increases significantly
Solution Approach 1:
The patent extracts and removes the contra-lateral portions (sound paths crossing to the opposite ear) from the room impulse response. By separating and eliminating these specific components that contribute less to spatial perception, the computational load is reduced while preserving the essential spatial audio effects through the remaining ipsi-lateral components.
Solution Approach 2:
The patent applies partial action by selectively processing only certain portions of the HRIRs. Instead of uniformly processing all components, it focuses computational resources on the ipsi-lateral portions that are most critical for spatial perception, omitting the less critical contra-lateral portions to achieve efficiency gains.
2Reliability
If long filters are used to simulate realistic sound environments, then spectral coloration is reduced, but computational overhead increases
Solution Approach 1:
The patent extracts and removes the contra-lateral portions from the long HRIR filters. By eliminating these specific components that extend the filter length but contribute less to spectral accuracy, the effective filter length is reduced, thereby decreasing computational overhead while maintaining the spectral characteristics of the essential ipsi-lateral paths.
Solution Approach 2:
The patent segments the HRIR into ipsi-lateral and contra-lateral portions, then processes only the essential ipsi-lateral segment for room impulse response generation. This segmentation allows selective retention of the computationally critical portion while discarding the less critical extension, resolving the trade-off between filter length and processing efficiency.
3Reliability
If cross-talk cancellation is implemented for accurate spatial audio, then virtualization quality improves, but phase disruptions occur
Solution Approach 1:
The patent extracts and removes the contra-lateral portions that are primarily responsible for cross-talk between ears. By eliminating these components that cause phase disruptions, the system achieves virtualization quality through the remaining ipsi-lateral paths without suffering from the phase accuracy problems associated with traditional cross-talk cancellation.
Data Source
AI summary
Audio loudspeaker and headphone virtualizers and methods use room impulse responses with modified individual head-related transfer functions prior to superposition including middle truncation; and perform convolutions in the frequency domain with zero-padded sections to avoid circular convolution overlap.