Acoustic Interference Suppression via Dynamic Counter-Signal Adaptation
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Solution Overview
Problem
Existing methods for suppressing acoustic interference signals from motor vehicle drive units in passenger compartments are suboptimal due to variations in physical conditions, affecting the detection and generation of counter-signals, leading to incomplete noise suppression.
Innovation Solution
A method that records physical parameters like pressure, humidity, and temperature in the passenger compartment, selects or adapts counter-signal parameters based on these conditions, and generates counter-signals with specific phases, frequencies, or intensities to effectively suppress interference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If counter-signals are generated based on detected interference signals, then acoustic interference suppression is achieved, but suppression effectiveness deteriorates under varying physical conditions
Solution Approach 1:
The patent implements dynamic adaptation by continuously monitoring physical parameters (temperature, humidity, pressure) and adjusting counter-signal parameters in real-time. The system transitions from static to dynamic operation, where counter-signal characteristics are continuously optimized based on current environmental conditions in the passenger compartment, thereby maintaining suppression effectiveness across varying physical conditions.
Solution Approach 2:
The patent applies parameter changes by modifying counter-signal parameters (phase, frequency, amplitude) according to detected physical conditions. When environmental parameters such as temperature or humidity change, the system adjusts the corresponding counter-signal parameters to compensate for the effects on sound propagation, ensuring consistent interference suppression performance across different physical states.
2Reliability
If physical parameters are continuously monitored and counter-signal parameters are adapted, then suppression performance under varying conditions is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by using a single control device that performs multiple functions: detecting interference signals, monitoring physical parameters, processing sensor data, and generating adapted counter-signals. This multi-functional approach consolidates what could be separate complex subsystems into one integrated unit, improving suppression performance while limiting the increase in overall system complexity.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors both the interference signals and physical parameters, then uses this information to adjust counter-signal parameters. The feedback loop enables automatic adaptation without requiring complex manual intervention or multiple independent control systems, thereby improving reliability while keeping the complexity increase manageable through systematic feedback control.
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
This approach ensures improved suppression of acoustic interference signals under varying physical conditions by generating tailored counter-signals that account for real-time and continuous changes in the passenger compartment, resulting in enhanced noise attenuation.
Implementation Method 1
The acoustic counter-signal, particularly due to a phase opposite to that of the acoustic interference signal, causes a, if necessary complete, suppression of the acoustic interference signal
Data Source
AI summary
The invention relates to a method for suppressing acoustic interference signals (5) resulting from the operation of a motor-vehicle drive unit (3) and introduced into a passenger compartment (4) of the motor vehicle (2) by means of at least one artificially produced acoustic counter-signal (6), which is defined by at least one counter-signal parameter, comprising the following steps: sensing at least one physical variable in the passenger compartment (4) of the motor vehicle (2), producing at least one piece of sensing information describing the at least one sensed physical variable in the passenger compartment (4) of the motor vehicle (2), selecting at least one counter-signal parameter influencing the acoustic counter-signal (6) in accordance with the physical variable described by the sensing information, and/or adapting at least one counter-signal parameter influencing the acoustic counter-signal (6) in accordance with the physical variable described by the sensing information, producing an acoustic counter-signal (6) on the basis of the at least one selected counter-signal parameter and/or on the basis of the at least one adapted counter-signal parameter, and outputting the produced acoustic counter-signal (6) into the passenger compartment (4) of the motor vehicle (2) in order to suppress acoustic interference signals (5) resulting from the operation of the motor-vehicle drive unit (3) and introduced into the passenger compartment (4) of the motor vehicle (2).