Engine Noise Compensation Control Amid In-Cabin Audio Interference
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Solution Overview
Problem
Existing EOC systems face instability due to interference from other audio signals within the vehicle interior, necessitating improved control methods to effectively compensate only for acoustic signals from the vehicle's drive motor while minimizing interaction with other audio signals.
Innovation Solution
A method and device that simulate the EOC system to detect and evaluate audio signals before they are output, allowing for early control of the EOC device based on assessment criteria to generate targeted acoustic compensation signals, reducing interference and ensuring only necessary signals are compensated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EOC system operates to compensate acoustic signals from the drive motor, then compensation effectiveness is improved, but instability occurs due to interaction with other audio signals in the vehicle interior
Solution Approach 1:
The patent segments the audio signal processing by creating separate evaluation paths: one for drive motor acoustic signals and another for other audio signals (music, speech, etc.). The system evaluates each type of signal independently using different criteria, allowing selective compensation only for drive motor signals while excluding other audio signals from compensation, thereby preventing instability caused by signal interaction
Solution Approach 2:
The patent applies preliminary action by evaluating and classifying audio signals before the EOC system generates compensation signals. The system detects and evaluates other audio signals in advance, determines their presence and characteristics, and uses this information to control whether compensation should be applied. This preliminary evaluation prevents unwanted interaction between compensation signals and other audio signals
2Object-generated harmful factors
If the EOC system compensates all acoustic signals in the vehicle interior, then overall noise reduction is improved, but non-drive motor audio signals are incorrectly compensated
Solution Approach 1:
The patent applies local quality by implementing different evaluation criteria for different types of audio signals. Drive motor acoustic signals are evaluated using criteria specific to motor noise characteristics (frequency ranges, harmonic content), while other audio signals are evaluated using different criteria. This allows the system to precisely distinguish and selectively compensate only the harmful drive motor signals while preserving other audio signals
Solution Approach 2:
The system performs preliminary detection and evaluation of audio signals to identify their source and characteristics before compensation decision-making. By evaluating signals in advance and classifying them as either drive motor signals or other audio signals, the system ensures accurate discrimination and prevents incorrect compensation of non-drive motor signals
Data Source
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AI summary
The invention relates to a method for operating a device (1) for generating acoustic compensation signals, which are used to compensate acoustic signals (3) that result from the operation of a motor-vehicle drive engine (4), comprising the steps: providing an EOC device (5), which is designed to generate acoustic compensation signals, which are used to compensate acoustic signals (3) that result from the operation of a motor-vehicle drive engine (4); providing a device (6) configured using the EOC device (5) as a model; determining at least one audio signal (10) to be output into a passenger compartment (8) of a motor vehicle (2) by means of an audio output device (7), before said audio signal is captured by an audio capturing element (5a) associated with the EOC device (5); using an evaluation specification to evaluate the at least one audio signal (10) with respect to at least one evaluation criterion; evaluation information describing with respect to the at least one evaluation criterion; controlling the operation of the EOC device (5) in order to generate acoustic compensation signals, which are used to compensate acoustic signals (3) that result from the operation of a motor-vehicle drive engine (4), on the basis of the evaluation information.