Audio Alert Fault Detection via Digital Signal Comparison
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Solution Overview
Problem
Alert generation systems, particularly in safety-critical applications like vehicles, are prone to failures that are difficult for humans to detect since they often remain silent, compromising safety due to multiple points of potential failure.
Innovation Solution
An alert fault detection system that processes analog signals from an audio alert generation system, converts them into a digitally-formatted signal, compares it with a stored digital alert audio file, and triggers a fault indicator if there is a significant mismatch, ensuring reliable detection and notification of system failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an alert generation system is implemented to provide safety warnings, then safety monitoring capability is improved, but the system introduces multiple potential failure points that reduce reliability
Solution Approach 1:
The alert generation system performs self-diagnosis by capturing its own output signal through a feedback path, converting it to digital format, and comparing it with the expected alert signal. This self-monitoring capability allows the system to detect its own failures without requiring external monitoring equipment, thereby improving reliability while avoiding the complexity of additional independent monitoring systems.
Solution Approach 2:
A feedback path is introduced that captures the output signal from the alert generation system and feeds it back to a comparison circuit. This feedback mechanism enables continuous monitoring of the alert signal integrity, allowing the system to detect deviations from expected behavior and identify failures in the alert generation path.
2Ease of operation
If the alert generation system remains simple and silent during normal operation, then ease of operation is improved, but failure detection becomes difficult
Solution Approach 1:
An intermediary monitoring circuit is introduced that acts as a mediator between the silent alert generation system and the user. This circuit captures the alert signal, converts it to digital format, and compares it with the expected signal, providing failure detection capability without requiring the system to produce audible or visible indicators during normal operation.
Solution Approach 2:
The patent replaces manual or mechanical monitoring methods with an electronic signal processing approach. By using digital signal conversion and electronic comparison circuits, the system achieves automated failure detection without requiring physical inspection or manual testing, maintaining silent operation while improving detectability of failures.
3Measurement precision
If signal conversion and comparison operations are added to detect faults, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The monitoring functions are merged into the existing alert generation system rather than being implemented as separate independent systems. The signal conversion and comparison operations are integrated within the same control unit that generates the alerts, sharing common hardware resources such as the digital signal processor and memory, thereby reducing overall system complexity while maintaining detection precision.
Solution Approach 2:
The alert generation system is designed with multi-functionality, serving both as the primary alert generator and as its own monitoring system. The same digital signal processing capabilities used to generate alerts are also utilized to convert and compare the alert signal for fault detection, eliminating the need for dedicated monitoring hardware and reducing overall device complexity.
Data Source
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AI summary
A method and system of fault detection for an alert generation system. In the audio alert generation system, a stored digital alert audio file is selected to be processed to generate an analog audio signal to drive a speaker. An alert fault detection system obtaining a signal from the audio alert generation system, converts the obtained signal to a digitally-formatted obtained audio signal, detects a fault in the audio alert generation system by comparing the digitally-formatted obtained audio signal with the stored digital alert audio file, and triggers a fault indicator