Virtual Speaker Simulation Using Spatial Audio Measurement
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Solution Overview
Problem
Current audio demonstration systems fail to accurately represent the spatial characteristics of sound sources, such as speakers, as they typically measure acoustic characteristics from a single point in space, neglecting the dispersion of sound waves and resulting differences in sound quality at various angles and distances.
Innovation Solution
A virtual speaker demonstration system that measures and combines temporal and spatial characteristics of a demonstration speaker at multiple points in space, using a microphone array and digital signal processing to simulate the speaker's performance on a reference speaker or speaker array, accounting for the spatial radiation patterns and environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single-point measurement approach is used to determine speaker characteristics, then the measurement process is simple and quick, but the accuracy of representing spatial audio characteristics deteriorates
Solution Approach 1:
The measurement system is segmented into multiple independent measurement points distributed in space. Each point captures local acoustic characteristics, and these segmented measurements are later synthesized to represent the complete spatial audio profile. This resolves the contradiction by dividing the complex spatial measurement problem into simpler point-wise measurements.
Solution Approach 2:
The system transitions from one-dimensional single-point measurement to three-dimensional spatial measurement. By adding spatial dimensions (multiple positions, angles, and distances), the system captures complete spatial audio characteristics that cannot be obtained from a single point, thereby improving measurement precision without excessive complexity increase.
2Measurement precision
If multiple-point spatial measurements are conducted, then the accuracy of speaker performance simulation improves, but the measurement time and process complexity increase
Solution Approach 1:
The system performs preliminary measurements at multiple spatial points to establish comprehensive acoustic characteristics before the actual simulation process. These pre-captured spatial data are stored and reused during simulation, eliminating the need to repeat time-consuming measurements during the simulation phase, thus reducing overall time loss while maintaining high accuracy.
Solution Approach 2:
The system creates a digital copy (virtual model) of the speaker's acoustic characteristics by measuring at multiple points and synthesizing the data. This virtual replica can then be used for repeated simulations without requiring additional physical measurements, thereby reducing time loss while preserving measurement precision.
3Loss of information
If traditional single-point transfer function measurement is used, then the equipment and process remain simple, but the ability to represent sound dispersion and directivity is lost
Solution Approach 1:
The system segments the acoustic field into multiple spatial points, capturing local characteristics at each position. This segmentation preserves spatial audio information about sound dispersion and directivity that would otherwise be lost in a single-point measurement, while maintaining manageable system complexity through structured measurement points.
Solution Approach 2:
The system introduces an intermediary processing layer that synthesizes multiple point measurements into a comprehensive spatial audio representation. This intermediary function preserves valuable spatial information by integrating data from multiple points, effectively mediating between simple measurement equipment and the need for comprehensive spatial data.
Data Source
AI summary
Embodiments of the present invention are directed to a system and method for demonstrating spatial performance of a demonstration speaker model to consumers in order to evaluate different speakers. The system and method comprise a microphone array for recording the output of the demonstration speaker model. The system and method comprise acoustic input samples for processing to an acoustic output and a processor for determining characteristics of each microphone recording, and processing an acoustic input sample and characteristics of each microphone recording corresponding to a selected demonstration speaker model. The system and method further comprise a reference speaker model for outputting an acoustic signal based on the result of the processing. The processing compensates for the performance characteristic of the reference speaker and the performance characteristic of the selected demonstration speaker so as to mimic the spatial characteristics of the demonstration speaker while avoiding bias from the reference speaker.