Vehicle Noise Reduction Virtual Reference Signal Generation
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Solution Overview
Problem
Existing noise reduction systems for vehicles face challenges in efficiently canceling background noise while imposing a high computational burden on processing units, particularly in 3D spaces with distributed noise sources.
Innovation Solution
A noise reduction system that incorporates a controller with multiple reference sensors, a sound generator, and an error microphone, utilizing a combination unit to generate a virtual reference signal from multiple inputs, reducing the need for parallel processing and enhancing coherence, and employing algorithms like Wiener Filters or neuronal networks to predict and adjust anti-noise signals for effective noise cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple reference sensors are processed in parallel using MIMO systems, then noise cancellation performance is improved, but computational burden increases significantly
Solution Approach 1:
The patent combines multiple reference signals from multiple reference sensors into a single virtual reference signal using a combination unit. This merging approach maintains the noise cancellation benefits of multiple sensors while reducing the computational complexity by processing a single combined signal instead of multiple parallel signals through a MIMO system.
2Measurement precision
If multiple reference sensors are used to detect background noise from distributed sources, then noise detection accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent introduces a combination unit as an intermediary that processes multiple reference signals and generates a virtual reference signal. This intermediary component consolidates the information from multiple sensors into a single representative signal, maintaining detection accuracy while simplifying the subsequent processing steps.
3Productivity
If extensive parallel processing is applied to handle multiple reference signals, then noise cancellation effectiveness is improved, but system resource consumption increases
Solution Approach 1:
The patent merges multiple reference signals into a single virtual reference signal, which reduces the computational resources required for processing. This approach maintains noise cancellation effectiveness by preserving the essential noise characteristics while consuming fewer system resources compared to extensive parallel processing.
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 achieves efficient noise cancellation with reduced computational load, allowing for improved performance and expanded quiet zones without the need for extensive parallel processing, thereby enhancing the noise reduction experience in vehicles.
Implementation Method 1
an error microphone, being configured to pick up background noise emitted by the noise source and anti-noise emitted by the sound generator
Implementation Method 2
The anti-noise is superimposed on the undesired background noise in that the background noise is reduced or almost completely eliminated in a quiet zone by means of destructive interference
Data Source
AI summary
A noise reduction system for actively compensating background noise in a noise reduction area in a transport area of a vehicle, the system includes a controller, at least one sensor detecting the background noise of the noise source, a sound generator generating anti-noise and at least one error-microphone to pick up background noise and anti-noise from the sound generator. The system includes sensors for detecting the background noise and are arranged at different positions in the vehicle, wherein each sensor generates a reference signal and the controller comprises a combination unit coupled to the sensors to receive the reference signals, the combination unit determines a virtual reference signal from the reference signals and is coupled to the dynamic adjustment unit in that the virtual reference signal is input to the anti-noise unit, for generating the anti-noise signal on a basis of the virtual reference signal.