Vehicle Noise Filter Configuration for Irregular Sound Cancellation
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Solution Overview
Problem
Active noise cancellation systems in vehicles struggle to effectively cancel irregular and changing background noises, leading to delayed noise cancellation and potential startle reactions for operators.
Innovation Solution
A noise cancellation system for vehicles that includes a microphone, a loudspeaker, and a control unit with a memory and noise filter. The control unit configures the noise filter based on vehicle-related information such as the type of implement, vehicle parameters, position, and weather conditions to optimize noise cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active noise cancellation systems use standard ANC algorithms, then continuous monotonous noises can be reduced, but irregular and changing background noises cannot be effectively cancelled
Solution Approach 1:
The noise filter is configured dynamically based on vehicle-related information such as implement type, vehicle parameters, position, and weather conditions. This allows the system to adapt its filtering characteristics to match the expected irregular noise patterns for different operating scenarios, resolving the contradiction between maintaining reliable cancellation for continuous noises and adapting to irregular noises.
Solution Approach 2:
The system pre-configures the noise filter based on vehicle-related information before the irregular noises occur. By predicting the type of irregular noises that will occur during specific vehicle operations and configuring the filter accordingly in advance, the system can effectively cancel these noises when they occur, rather than reacting with delay.
2Reliability
If ANC systems react to irregular noises in real-time, then noise cancellation occurs, but there is a short delay causing unimpeded noise to reach the operator's ear first
Solution Approach 1:
The system performs preliminary configuration of the noise filter based on vehicle-related information before the irregular noises occur. By predicting the noise characteristics based on implement type, vehicle parameters, position, and weather conditions, the system prepares the appropriate filter settings in advance, eliminating the delay that occurs with real-time reactive approaches.
3Device complexity
If ANC systems use fixed filter configurations, then system complexity is reduced, but the system cannot adapt to different vehicle operations and noise types
Solution Approach 1:
The system changes the parameters of the noise filter based on vehicle-related information such as implement type, vehicle parameters, position, and weather conditions. Rather than using a completely adaptive complex algorithm, the system selects from predefined filter configurations corresponding to different operating scenarios, maintaining relatively low system complexity while achieving adaptability to different noise types.
4Reliability
If ANC systems cancel all noises, then noise reduction performance is improved, but sudden loud noises can still startle the operator
Solution Approach 1:
The system applies different noise cancellation strategies to different noise types. The noise filter is configured to cancel irregular noises that are predictable based on vehicle operations, while allowing sudden loud noises that fall outside the configured patterns to pass through. This localized differentiation in cancellation approach prevents startle reactions while maintaining overall noise reduction performance.
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 improves operational safety by effectively canceling irregular noises in real-time, reducing the likelihood of startle reactions and improving the overall noise reduction performance in various vehicle operations.
Implementation Method 1
a microphone for receiving noise and generating a corresponding noise signal
Implementation Method 2
a loudspeaker for emitting an acoustic wave according to a cancellation signal to cancel the noise
Implementation Method 3
The controller is configured to obtain at least a vehicle related information of the vehicle to configure the noise filter based on the at least one vehicle related information and to generate a cancellation signal based on the noise signal and the noise filter
Data Source
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AI summary
A noise cancellation system (21) for a vehicle (1), with a microphone (3) for receiving noise and generating a corresponding noise signal; a loudspeaker (4) for emitting an acoustic wave according to a cancellation signal to cancel the noise; a control unit (5) comprising a memory (9) and a controller (8); wherein the memory (9) has a noise filter; and wherein the controller (8) is configured to obtain at least a vehicle related information of the vehicle (1); to configure the noise filter based on the at least one vehicle related information; and to generate a cancellation signal based on the noise signal and the noise filter.