Helmet Active Noise Control Selective Sound Attenuation
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Solution Overview
Problem
Motorcyclists face impaired hearing and safety risks due to high noise levels from engine noise, wind noise, and helmet design, with existing noise reduction methods either over-reducing desired sounds or under-reducing undesired sounds, and failing to adapt to changing environments.
Innovation Solution
An automatic noise control system for helmets with a rigid shell, incorporating internal and external sensors and loudspeakers to generate anti-sound through destructive superposition, combining passive and active noise reduction techniques to selectively attenuate unwanted noise while preserving desired sounds like vehicle signals and music.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound deadening material or earplugs are used to reduce noise, then noise levels are reduced, but desired sounds such as vehicle signals and warnings are also reduced or canceled
Solution Approach 1:
The system applies different noise control strategies to different frequency ranges and sound sources. Harmonic sounds (motorcycle engine, music) are treated differently from non-harmonic sounds (wind noise), and desired sounds (sirens, horns) are preserved while unwanted noise is reduced. This selective approach allows local differentiation in noise treatment based on sound characteristics.
Solution Approach 2:
The system dynamically adjusts noise reduction levels based on real-time environmental conditions, motorcycle speed, and detected sound patterns. The noise control adapts to changing situations, increasing reduction when motorcycle noise dominates and decreasing reduction when ambient warnings are detected, ensuring optimal balance between noise reduction and awareness.
2Object-affected harmful factors
If strong noise reduction is applied, then unwanted noise is reduced, but the system cannot distinguish between desired and undesired sounds
Solution Approach 1:
The system continuously monitors ambient sounds, motorcycle speed, and noise patterns, then adjusts noise reduction levels in real-time based on this feedback. Sensors detect sound patterns and feed this information back to the control system, which modifies the noise reduction strategy accordingly, enabling adaptive response to changing environmental conditions.
Solution Approach 2:
The system changes operational parameters (noise reduction level, frequency filtering) based on detected conditions such as motorcycle speed, ambient noise levels, and sound pattern analysis. By dynamically adjusting these parameters, the system adapts to different riding scenarios and environmental conditions.
3Object-affected harmful factors
If passive noise reduction methods are used, then noise is reduced, but the system lacks automatic adjustment capability for different environments
Solution Approach 1:
The system automatically monitors and adjusts noise reduction levels without user intervention. Sensors continuously detect environmental conditions and sound patterns, and the control system autonomously modifies noise reduction settings based on detected patterns, enabling the system to serve itself in adapting to different riding conditions.
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
Effectively reduces noise levels, enhancing safety and comfort by selectively canceling non-harmonic sounds like wind noise while allowing harmonic sounds from vehicles and music to be audible, and automatically adjusting to different environments and situations.
Implementation Method 1
anti-sound in the shell interior based on at least one input signal, the anti-sound configured to attenuate sound occurring in the shell interior through destructive superposition
Data Source
AI summary
An automatic noise control system and method for a helmet with a rigid shell that is configured to spatially divide a shell interior from a shell ambiance include generating in connection with at least one loudspeaker disposed in the shell interior anti-sound in the shell interior based on at least one input signal. The anti-sound is configured to attenuate sound occurring in the shell interior through destructive superposition. The system and method further include providing the at least one input signal by at least one of picking up sound in the vicinity of the loudspeaker in the shell interior, picking up vibrations of the shell, and picking up sound in the vicinity of the shell exterior.