Vehicle Active Noise Reduction with User-Defined Parameter Sets

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Solution Overview

Problem

Conventional active noise reduction devices lack the ability to adaptively adjust parameters based on user preferences, leading to suboptimal noise reduction performance and potential anomalies in noise control.

Innovation Solution

An active noise reduction device that includes a signal processor using an adaptive filter with coefficients updated by an error signal, and a communicator that allows users to designate parameter sets for generating cancelling signals, enabling personalized noise reduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional active noise reduction devices use fixed parameter sets for generating cancelling signals, then the device structure remains simple, but the noise reduction performance cannot be optimized according to user preferences and may produce anomalies

Engineering Contradiction:

Improvenoise reduction performanceVSAvoidparameter adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic parameter selection by allowing the system to switch between multiple parameter sets (first and second parameter sets) based on operational conditions or user selection. This enables the noise reduction device to adapt its filtering characteristics in real-time, improving noise reduction performance for different scenarios while maintaining system reliability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameters of the adaptive filter by providing multiple predefined parameter sets with different characteristics. The system can select between a first parameter set and a second parameter set, each optimized for different noise conditions or user preferences, thereby improving overall noise reduction effectiveness without requiring complex real-time parameter optimization.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If users can designate parameter sets for personalized noise reduction, then user satisfaction improves, but the device complexity increases due to additional communication and parameter management functions

Engineering Contradiction:

Improveuser customizationVSAvoidsystem structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The noise reduction device incorporates multiple functions within a unified system: automatic noise reduction using adaptive filters, user-selectable parameter sets, anomaly detection, and notification functions. By integrating these diverse functions into a single device, the patent improves ease of operation and user satisfaction while avoiding the complexity of multiple separate systems.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system includes automatic anomaly detection and notification capabilities that operate without requiring continuous user intervention. The device can autonomously monitor its operation, detect anomalies in noise reduction performance, and notify users or switch parameter sets automatically, reducing the operational burden on users while maintaining personalized noise reduction.

Inventive Principle:

Principle #25Self-service

3Productivity

If the adaptive filter coefficients are continuously updated based on error signals, then the noise reduction adapts to changing noise conditions, but the system may become unstable when anomalies occur

Engineering Contradiction:

Improvenoise reduction effectivenessVSAvoidsystem stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent prepares multiple parameter sets in advance, each optimized for different operating conditions. When an anomaly is detected during adaptive filtering, the system can switch to a pre-prepared alternative parameter set, preventing instability without requiring complex real-time stabilization algorithms. This prior preparation ensures system reliability while maintaining noise reduction effectiveness.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The system uses error signals from the noise reduction process to continuously update adaptive filter coefficients, creating a feedback loop that improves noise reduction effectiveness. Additionally, anomaly detection mechanisms monitor this feedback process, and when anomalies are detected, the system can switch parameter sets or adjust updating behavior, maintaining stability while preserving the adaptive noise reduction capability.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20240071360A1Active noise reduction device, active noise reduction system and active noise reduction method

Publication Date: 2024.02.29 PANASONIC AUTOMOTIVE SYST CO LTD

AI summary

An active noise reduction device includes a signal processor that generates a cancelling signal for outputting a cancelling sound for reducing noise in an interior of a vehicle and a communicator that receives a change request for changing a parameter set related to generation of the cancelling signal to a user-designated parameter set that is designated by a user, and the signal processor generates the cancelling signal by using the user-designated parameter set based on the change request received.