Audio Distance Rendering Adjusting Gain and Correlation
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Solution Overview
Problem
Conventional distance rendering methods in VR environments fail to maintain spatial characteristics and binaural correlation when the relative distance between a user and a sound image changes, leading to decreased spatial sense and binaural correlation.
Innovation Solution
An audio distance rendering method that adjusts gain parameters and reverberation periods in room response modeling based on changes in distance, and adjusts binaural correlation by modifying the late reverberation part of the binaural room impulse response, ensuring consistent spatial and binaural characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gain of direct part is increased and gain of early reflection and late reverberation part is decreased to reduce distance, then the sound source sounds bigger, but the spatial sense and binaural correlation are decreased
Solution Approach 1:
The patent changes multiple parameters simultaneously - not only the gain of direct and reverberation parts but also the correlation coefficient of late reverberation - to maintain spatial characteristics while rendering distance changes. This multi-parameter adjustment resolves the contradiction by compensating for spatial characteristic degradation through correlated parameter modifications.
Solution Approach 2:
The patent combines multiple processing elements (direct sound, early reflection, late reverberation with adjusted correlation) into a composite audio output. By composing the final audio signal from multiple processed components with adjusted correlation coefficients, the system maintains spatial characteristics while achieving distance rendering effects.
2Ease of manufacture
If the gain of direct part is decreased and gain of early reflection and late reverberation part is increased to increase distance, then the sound source sounds smaller, but the spatial sense and binaural correlation are decreased
Solution Approach 1:
The patent adjusts multiple parameters including the gain of reverberation parts and the correlation coefficient simultaneously. When increasing distance, it not only increases reverberation gain but also modifies the correlation coefficient to maintain natural spatial characteristics, resolving the contradiction between distance rendering and spatial characteristic preservation.
Solution Approach 2:
The patent composes the final audio signal from multiple processed components including direct sound, early reflection, and late reverberation with adjusted correlation coefficients. This composite approach allows distance rendering while maintaining spatial characteristics through the combined effect of multiple processed audio elements.
3Ease of manufacture
If a remarkably modified gain is applied to room response to achieve very close distance, then the sound source sounds very big, but the user may not feel reverberation and spatial characteristic varies as in an anechoic room
Solution Approach 1:
The patent modifies multiple parameters including the correlation coefficient of late reverberation in addition to gain adjustments. This prevents the complete loss of reverberation characteristics that would occur with gain modification alone, maintaining spatial characteristics even at very close distances where the sound source appears very big.
Solution Approach 2:
The patent composes the final audio from multiple processed components including direct sound, early reflection, and late reverberation with adjusted correlation. This composite structure ensures that even when gain is remarkably modified for very close distance, the spatial characteristics are preserved through the combined contribution of multiple audio elements with appropriate correlation.
Data Source
AI summary
Disclosed are a distance rendering method used for audio signal output and an audio signal output apparatus using the same. The distance rendering method includes receiving a decoded audio signal, checking whether a distance between a user and a sound image is changed, if the distance is changed, calculating a gain parameter gnew and a period parameterτnew, applied to room response modeling, based on the changed distance, so as to maintain a space characteristic, and generating room response modeling for maintaining the space characteristic even when the distance is changed, using the calculated period parameter τnew and gain parameter gnew.