Microphone Array Focusing on Single Point for Impact Sound Capture
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Solution Overview
Problem
Existing systems struggle to capture high-quality impact sounds from striking objects and projectiles due to ambient noise interference, making it difficult to accurately analyze the sound profiles essential for equipment design and performance evaluation in sports.
Innovation Solution
A microphone array system with a base and arm configuration that positions multiple microphones to focus on a single point, effectively disregarding ambient noise by using a plurality of microphones situated on a stand with specific curvatures and distances to capture high-quality impact sounds, and analyzing these signals using methods like fast Fourier transform and delay sum array processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single microphone is used to capture impact sound, then the device complexity is low, but the measurement precision is insufficient due to ambient noise interference
Solution Approach 1:
The system divides the sound capture function into multiple microphones arranged in a specific geometric pattern, with each microphone capturing sound from a different angle. The curvature radii are specifically designed to position microphones at equal distances from the focal point, allowing individual microphone signals to be processed and combined to achieve superior noise rejection and impact sound quality compared to a single microphone.
Solution Approach 2:
The system combines signals from multiple microphones through digital signal processing techniques including Fast Fourier Transform and delay-sum array processing. By merging the captured signals with appropriate time delays and weighting, the system achieves enhanced signal-to-noise ratio and precise localization of impact sounds, overcoming the limitations of individual microphones.
2Measurement precision
If multiple microphones are positioned close to the impact point to capture high-quality sound, then the measurement precision improves, but the object-generated harmful factors increase due to interference with the striking motion
Solution Approach 1:
The system transitions from a single-point measurement approach to a spatially distributed array configuration. By positioning multiple microphones at specific distances and angles defined by curvature radii R1 and R2, the system captures impact sounds from multiple spatial dimensions simultaneously, achieving high measurement precision while maintaining sufficient distance from the impact zone to avoid interfering with the striking motion.
3Measurement precision
If microphones are positioned at different distances from the impact point, then the device complexity is reduced, but the measurement precision decreases due to inconsistent signal quality
Solution Approach 1:
The system employs specific geometric parameters (curvature radii R1 and R2) to define the microphone positions. By carefully selecting these parameters, all microphones are positioned at equal distances from the focal point, ensuring consistent signal quality and time of flight characteristics. This parametric approach simplifies the positioning requirements while maintaining high measurement precision across all microphones.
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
The system successfully extracts high-quality impact sound profiles, reducing the influence of ambient noise and allowing for precise analysis of sound profiles, which can inform equipment design and improve performance in sports like golf, baseball, and tennis.
Implementation Method 1
the impact sound is received at one or more of the microphones in the microphone array so that one or more of the microphones generates an impact signal
Data Source
AI summary
A system for capturing high quality sound information from an impact includes a microphone stand and microphone array. The microphone stand is configured so that the microphone array arranged thereupon is focused on a single point so that ambient noise may be reduced.