Adaptive Band Limit Module for DEMON Noise Analysis
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Solution Overview
Problem
The existing DEMON analysis method for amplitude-modulated broadband noise relies heavily on manual selection of the demodulation band, which is cumbersome and lacks an optimal setting indication, affecting the analysis performance.
Innovation Solution
An adaptive band limit module is introduced to automatically adjust the filter settings of the bandpass based on an evaluation criterion, such as the S/N ratio, to optimize the demodulation band for improved detection and classification results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual selection of demodulation band is used in DEMON analysis, then operator control over analysis parameters is maintained, but the process becomes cumbersome and lacks optimal setting indication, reducing productivity and ease of operation
Solution Approach 1:
The system performs self-service by automatically selecting optimal demodulation band settings through the adaptive band limit module, which evaluates signal characteristics and adjusts filter parameters without requiring manual operator intervention, thereby eliminating the cumbersome manual selection process while maintaining operational control
Solution Approach 2:
The adaptive band limit module dynamically changes filter parameters (center frequency, bandwidth, cutoff frequencies) based on real-time evaluation of signal characteristics and detection performance, allowing the system to adapt to varying operating conditions and automatically find optimal settings without manual reconfiguration
2Adaptability or versatility
If manual adjustment of bandpass filter settings is performed, then flexibility in parameter selection is maintained, but the complexity of the analysis process increases and optimal settings cannot be reliably determined
Solution Approach 1:
The system implements feedback through the evaluation criterion mechanism, where detection performance metrics are continuously monitored and fed back to the adaptive band limit module, which then adjusts filter settings accordingly. This closed-loop approach enables automatic adaptation to optimal settings while simplifying the overall process by replacing complex manual trial-and-error procedures with automated feedback-driven parameter optimization
3Measurement precision
If fixed grid bandpass settings are used, then device complexity is reduced, but the ability to find optimal demodulation band settings is compromised, affecting measurement precision
Solution Approach 1:
The system transitions from static fixed-grid filter settings to dynamic adaptive filtering, where the bandpass parameters are continuously adjusted based on real-time signal characteristics and detection performance. The adaptive band limit module enables the system to dynamically find and track optimal demodulation band settings, significantly improving measurement precision while the automated nature of the process prevents excessive increase in operational complexity
Data Source
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AI summary
The invention relates to a method for analyzing amplitude modulated broadband noises emitted by bodies, in particular operating noises emitted by propeller driven vehicles, which are transferred as acoustic signals after a pre-processing 11 as input signals to an analysis device 1 wherein they are filtered by means of a band pass 3 according to the settings of the analysis device 1, demodulated by means of a demodulator 5 in respect of their envelopes, released from a DC component by means of a high pass 7 and subjected to a spectral analysis 9. The analysis device 1 generates so-called DEMON spectra, on the basis of which an evaluation of the settings of the analysis device 1 are carried out in an evaluation device 15. The filter settings of the band pass 3 are then changed by means of an adaptive band limit module 17 in dependence on a previously determined evaluation criterion. The invention furthermore relates to a device for carrying out said method.