Sound Source Positioning via Camera Coordinate Geometry
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Solution Overview
Problem
Existing audio reproduction technologies, such as multi-channel loudspeaker systems, struggle to provide a natural spatial sound impression across a wide area and fail to accurately position sound sources in relation to visual elements, leading to a mismatch between visual and auditory perceptions in audio-visual systems, especially in virtual environments.
Innovation Solution
A device and method for determining the reproduction position of a sound source in an audio-visual reproduction system, using camera coordinates and aperture angles to calculate the optimal positioning of sound sources relative to a projection reference point, allowing for accurate spatial sound reproduction that matches visual elements, even when the camera aperture deviates from standard settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multi-channel loudspeaker reproduction is used, then audio signals can be reproduced with standardized formats, but the spatial sound impression is limited to a small sweet spot area and does not provide natural spatial reproduction across a wide area
Solution Approach 1:
The reproduction space is divided into multiple zones with different acoustic characteristics. The system segments the sound field into early reflections (first reflections from walls) and late reflections (subsequent reflections), processing each segment differently to achieve accurate spatial positioning across the entire reproduction area, not just at a single sweet spot.
Solution Approach 2:
The system transitions from traditional 2D horizontal sound field reproduction to 3D spatial sound reproduction by incorporating vertical dimension through ceiling-mounted loudspeakers and adjusting reflection paths. This dimensional expansion enables natural spatial impression across a wide area by creating immersive three-dimensional sound environments.
2Manufacturing precision
If wave-field synthesis is employed to achieve natural spatial sound impression across great area, then direction and distance of sound sources are reproduced exactly, but computer power requirements and transfer rates become enormous
Solution Approach 1:
The system extracts and processes only the most critical acoustic parameters (early reflections and late reflections) separately, rather than computing the complete wave field. By focusing on these key components and using simplified calculation models for each, the system achieves accurate spatial positioning with significantly reduced computational requirements compared to full wave-field synthesis.
Solution Approach 2:
The system performs preliminary calculations of reflection paths and acoustic parameters during the setup phase, storing pre-computed data for early and late reflections. This preliminary action eliminates the need for real-time computation of complex wave fields during audio reproduction, reducing computer power requirements while maintaining positioning accuracy.
3Ease of manufacture
If wave-field synthesis is executed based on environmental conditions that do not match actual conditions, then calculation can be simplified, but irregularities occur in sound reproduction quality
Solution Approach 1:
The system dynamically adapts to actual environmental conditions by measuring the real acoustic environment and adjusting the reflection calculation models accordingly. Rather than using fixed predetermined parameters, the system modifies early and late reflection paths based on measured wall positions, materials, and room geometry, ensuring high sound reproduction quality across different environments while maintaining ease of setup through automated measurement.
4Manufacturing precision
If manual steps are used during post-production to convey acoustic impression matching the image, then authentic audio-visual impression can be achieved, but the process becomes expensive and time-consuming
Solution Approach 1:
The system replaces manual mechanical post-production processes with automated computer-based calculation and processing. By using algorithms to automatically calculate reflection paths, determine sound source positions, and synchronize audio with video based on camera and loudspeaker coordinates, the system achieves authentic audio-visual impressions without the time-consuming manual steps previously required.
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 solution enables realistic sound-source positioning that accounts for both visible and invisible sound sources, ensuring a consistent and immersive audio-visual experience by synchronizing sound with visual elements, enhancing the authenticity of virtual environments.
Implementation Method 1
transforming a recording position of the source of sound to a camera coordinate system, the origin of which is defined, in relation to a camera aperture
Implementation Method 2
to calculate the reproduction position on the basis of an intersection point between a straight line extending through the recording position of the source of sound in the camera coordinate system and through the common starting point and the reproduction surface
Data Source
AI summary
A method and device are provided for determining a reproduction position of a source of sound for audio-visual reproduction of a film scene from a plurality of individual pictures with regard to a reproduction surface having a predetermined width, and with regard to a projection source having a projection reference point. A recording position of the source of sound, a camera position during recording, and an aperture angle of the camera during recording are obtained and the determined recording position is transformed to a camera coordinate system. A reproduction position for the source of sound is calculated and used to produce sound-source positioning in a reproduction room using wave-field synthesis methods.