Audio Capture and Rendering with Variable Directivity
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Solution Overview
Problem
Current audio capture and reproduction technologies fail to accurately represent the diverse sound generation mechanisms and emission characteristics of musical instruments and human voices, primarily focusing on linear translation while neglecting rotational and vibrational components, leading to an incomplete sound experience.
Innovation Solution
A method and apparatus that capture and render audio scenes by acquiring and processing sound signals with distinct directivities, separating and processing high and low directivity signals separately to accurately represent the translational, rotational, and vibrational components, and reproducing them using specific loudspeaker arrangements with varying directivities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single microphone arrangement and single loudspeaker arrangement are used, then the system complexity is low, but the sound reproduction accuracy and authenticity are insufficient
Solution Approach 1:
The patent divides the sound capture and reproduction system into multiple independent channels with different directivities. Multiple microphone arrangements with varying directivity patterns capture different aspects of the sound scene, and multiple loudspeaker arrangements reproduce these separate components. This segmentation allows accurate representation of complex sound sources while maintaining manageable system complexity through modular processing.
Solution Approach 2:
The patent applies different directivity characteristics to different microphone and loudspeaker arrangements to match the specific emission characteristics of different sound sources. High directivity arrangements capture directional sounds like trumpets, while low directivity arrangements capture omnidirectional sounds like string instruments. This local quality approach ensures each component is reproduced with its authentic spatial characteristics.
2Loss of information
If conventional audio capture methods are used, then the equipment and processing are simple, but the rotational and vibrational components of sound are neglected
Solution Approach 1:
The patent segments the sound capture process into multiple channels with different directivities, allowing separate acquisition of translational, rotational, and vibrational sound components. Each microphone arrangement is optimized to capture specific components of sound energy, and these separate signals are processed and reproduced independently to preserve the complete sound information.
3Illumination intensity
If high sound levels are used for reproduction, then the sound quality and immersion are improved, but power consumption increases and hearing damage risk increases
Solution Approach 1:
The patent uses different directivity patterns in loudspeaker arrangements to distribute sound energy more efficiently. By matching the directivity of loudspeakers to the characteristics of the captured sound components, the system achieves better spatial immersion and perceived sound quality at lower overall sound levels, reducing power consumption and hearing damage risk.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables a more authentic and immersive sound reproduction that closely mimics the original sound scene, enhancing the perceived quality and reducing sound levels by up to 10 dB compared to conventional systems, while minimizing power consumption and potential hearing damage.
Implementation Method 1
acquiring sound having a first directivity to achieve a first acquisition signal; acquiring sound having a second directivity to achieve a second acquisition signal
Implementation Method 2
rendering the first mixed signal or the first acquisition signal using a loudspeaker arrangement having a first directivity and simultaneously rendering the second mixed signal or the second acquisition signal using a loudspeaker arrangement having a second directivity
Data Source
AI summary
The method of capturing an audio scene includes acquiring sounds having first and second directivities to obtain first and second acquisition signals, respectively, the first directivity being higher than the second directivity, the steps of acquiring being performed simultaneously, and both acquisition signals together representing the audio scene; separately storing the first and second acquisition signals or mixing individual channels in the acquisition signals to obtain first and second mixed signal, respectively, and separately storing the first and second mixed signals, or transmitting the first and second mixed signals or the first and second acquisition signals to a loudspeaker setup and rendering the first mixed signal or the first acquisition signal using a loudspeaker arrangement having a first directivity and simultaneously rendering the second mixed signal or the second acquisition signal using a loudspeaker arrangement having a second directivity, the second loudspeaker directivity being lower than the first one.