Acoustic Sensor Enclosure for Passive Environmental Noise Isolation
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Solution Overview
Problem
Acoustic devices used to sense physical phenomena are often compromised by surrounding environmental noise, leading to inaccurate measurements and compromised performance.
Innovation Solution
A passive noise management system that includes a housing with sound reducers, such as insulation and sound reduction coatings, to enclose an acoustic device and reduce environmental noise, combined with a control circuit for active noise cancellation using machine learning or AI models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acoustic devices are used in noisy environments, then they can monitor objects in real-time, but measurement accuracy deteriorates due to environmental noise interference
Solution Approach 1:
The system divides the monitoring function into two separate components: an acoustic device for capturing sound signals and a noise management system for filtering environmental noise. This segmentation allows each component to specialize in its function, maintaining real-time monitoring capability while improving measurement accuracy through dedicated noise processing.
Solution Approach 2:
The noise management system acts as an intermediary between the acoustic device and the measurement output. It receives raw acoustic signals, processes them by removing environmental noise interference, and then provides cleaned measurements, thereby preserving real-time monitoring while enhancing accuracy.
2Object-affected harmful factors
If passive noise isolation structures are added around the acoustic device, then noise reduction is achieved, but device complexity increases
Solution Approach 1:
The housing with sound reducers is designed to nest around the acoustic device, creating a compact integrated unit. The acoustic device fits within the housing volume, and sound reducers are positioned within the housing structure, allowing noise isolation functionality to be added without significantly increasing overall system footprint or complexity.
Solution Approach 2:
The noise management system combines multiple noise reduction mechanisms (passive isolation through housing and active cancellation through sound reducers) into a single integrated system. This merging approach consolidates what could be separate complex components into one unified noise management solution.
3Object-affected harmful factors
If active noise cancellation using control circuits and AI models is implemented, then noise reduction effectiveness improves, but energy consumption increases
Solution Approach 1:
The control circuit operates in periodic cycles, using the microphone to sense noise, processing signals through AI models, and generating anti-noise signals through the speaker. This periodic operation allows the system to balance energy consumption with noise reduction effectiveness, activating intensive processing only when needed rather than continuously.
Solution Approach 2:
The system uses feedback from the microphone to continuously monitor environmental noise and dynamically adjust the anti-noise signal generation. This feedback mechanism allows the control circuit to optimize energy usage by processing signals only when noise interference is detected, rather than consuming energy continuously regardless of noise conditions.
Data Source
AI summary
A passive noise management system includes a housing that includes a volume defined by an outer surface and an inner surface; and an opening in the housing configured to access the volume. The volume is configured to at least partially enclose an acoustic device configured to measure acoustic energy generated by an object. The housing is configured to couple to the object to form an enclosure around the acoustic device that is fluidly decoupled from an ambient environment. The enclosure includes the housing and at least a portion of the object. The passive noise management system includes at least one sound reducer coupled to the housing or enclosed within the volume. The at least one sound reducer is configured to reduce an amount of environmental noise transferred from the ambient environment, through the housing, and to the acoustic device.