Active Noise Control Reference Signal Extrapolation
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Solution Overview
Problem
Modern motor vehicles face challenges in actively influencing noise due to the limited availability of engine speed reference variables, which are only updated at a low rate, making it difficult to operate active noise reduction systems effectively, especially during engine acceleration and braking.
Innovation Solution
A method that extrapolates discrete-time characteristic reference variables using past values and change parameters to generate a continuous reference signal, allowing for adaptive compensation sound injection with high amplitude and phase accuracy, eliminating the need for additional measuring sensors and cabling by directly coupling with existing data buses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If discrete-time reference variables from data buses are used for active noise control, then device complexity is reduced by eliminating additional sensors, but measurement precision deteriorates due to low update rates
Solution Approach 1:
The patent applies preliminary action by performing extrapolation of reference variables before they are needed for active noise control. The system uses past values and change parameters to predict future reference variable values, ensuring continuous and accurate reference signals are available for the noise control algorithm without requiring additional sensors or high-speed data buses.
2Measurement precision
If additional measuring sensors are installed for continuous reference signals, then measurement precision improves, but device complexity increases due to additional cabling and sensors
Solution Approach 1:
The patent applies copying by creating a mathematical model (extrapolation) that replicates the behavior of continuous reference signals from discrete data bus values. Instead of physically copying the reference signal through additional sensors and cabling, the system copies the temporal characteristics through computational extrapolation using past values and change parameters, achieving continuous reference signals without additional hardware.
3Ease of operation
If discrete sampling rates from data buses are used, then ease of operation improves by using existing systems, but reliability deteriorates during engine acceleration and braking
Solution Approach 1:
The patent applies dynamics by making the reference signal adaptive through extrapolation. The system dynamically adjusts reference variable values based on change parameters and past values, allowing the reference signal to respond to rapid engine speed changes during acceleration and braking. This maintains reliability while keeping ease of operation by using existing data bus infrastructure.
4Reliability
If continuous reference signals are generated through extrapolation, then reliability improves for active noise control, but device complexity increases due to extrapolation computation
Solution Approach 1:
The patent applies parameter changes by transforming discrete reference variable values into continuous reference signals through extrapolation using change parameters. The system changes the temporal parameter of the reference signal from discrete to continuous while using computational methods that balance accuracy with processing requirements, maintaining reliability without excessive computational complexity.
Data Source
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AI summary
Method for improving the perceived acoustics of an area, comprising the following method steps: recording at least one sound signal using a recording means in the vicinity of at least one sound source in the area; carrying out a respective convolution operation on the recorded sound signal with a respective pulse response function for generating different optimized sound signals, with the respective pulse response function being selected from a range of prespecified pulse response functions for the area; playing-back the optimized sound signals using sound play-back means which are arranged in the area, with a different optimized sound signal being supplied to each sound play-back means, and with the optimized sound signals in each case being supplied to the sound play-back means after a changeover time interval in such a way that the same optimized sound signal is not supplied to any of the play-back means in immediately successive changeover time intervals.