Active Noise Control for Vehicle Hardware Components
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Solution Overview
Problem
As vehicle interiors become quieter, unwanted noises from functional hardware components such as switches, closures, and seat adjustments become more noticeable, and there is a desire to either eliminate or enhance these sounds during use.
Innovation Solution
A vehicular active noise control system comprising a microphone, controller, and speaker that detects noise from hardware components, identifies the component, and outputs a noise cancelling or enhancing signal pre-associated with the component to attenuate or enhance the sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vehicle interior noise reduction is improved, then cabin quietness is enhanced, but noise from functional hardware components becomes more noticeable
Solution Approach 1:
The system applies preliminary anti-action by generating anti-noise signals before the hardware component noise reaches the cabin. The active noise control system detects noise from functional hardware components and generates corresponding anti-noise signals to cancel them out, preventing the noise from affecting the cabin environment.
Solution Approach 2:
The system converts the harmful hardware component noise into a beneficial effect by using it as the target for active noise cancellation. The noise generated by functional hardware components is detected and transformed into anti-noise signals that, when combined with the original noise, produce silence or desired sound in the cabin.
2Object-affected harmful factors
If active noise control is applied to all functional hardware components, then noise attenuation is improved, but system complexity increases
Solution Approach 1:
The system applies universality by using a single active noise control system to handle multiple different functional hardware components. The controller identifies the specific component generating noise and selects appropriate anti-noise signals from stored data, allowing one system to address various noise sources without requiring separate systems for each component.
Solution Approach 2:
The system applies preliminary action by pre-storing anti-noise signals for different functional hardware components in the controller memory. When a component is activated, the controller quickly retrieves the corresponding pre-prepared anti-noise signal, eliminating the need for real-time generation and reducing computational complexity.
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 unwanted noise from hardware components, providing a quieter or more pleasant auditory experience within vehicle cabins by using active noise control, sound enhancement, and masking techniques.
Implementation Method 1
The speaker is configured to output a noise cancelling sound based on the noise cancelling signal whereby the noise is attenuated
Data Source
AI summary
A system includes a microphone, a controller, and a speaker. The microphone is configured to detect noise generated by a functional hardware component due to user interaction with the component. The controller is configured to identify the component from the noise and obtain a noise cancelling signal pre-associated with identification of the component. The speaker is configured to output a noise cancelling sound based on the noise cancelling signal whereby the noise is attenuated.