Supplemental Alert Generator for Fire Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing smoke, fire, and carbon monoxide detectors often fail to effectively alert certain individuals, such as children, heavy sleepers, and the hearing impaired, due to the inadequacy of the 3100-3200 Hz pure tone alert signals, prompting the need for supplemental alert systems that can enhance detection and alerting capabilities.
Innovation Solution
A battery-powered supplemental alert generator is designed to be mounted near conventional detectors, operating in a low-power mode to monitor sound levels and analyze signals for standard alert patterns, generating supplemental alerts like a 520 Hz square wave or strobe light signals when necessary, thereby increasing alert effectiveness and compliance with new regulations at a lower cost than replacing existing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional detector uses a 3100-3200 Hz pure tone alert signal, then the device complies with existing regulations and uses simple signal generation, but the alert signal is inadequate for alerting children, heavy sleepers, and the hearing impaired
Solution Approach 1:
The alert signal is segmented into multiple frequency components: the original 3100-3200 Hz pure tone is combined with a supplemental lower frequency tone (e.g., 520 Hz square wave signal). This segmentation allows the system to maintain compliance with existing regulations while adding enhanced alerting capabilities for different populations through multi-frequency signaling.
Solution Approach 2:
The supplemental alert generator is designed to be universally compatible with existing conventional detectors, serving multiple functions: it supplements the original alert signal for hard-to-reach populations, complies with new regulations requiring lower frequency signals, and can be integrated with various detector types without requiring replacement of the original device.
2Measurement precision
If a supplemental alert generator continuously monitors sound levels and analyzes signals, then the alert detection accuracy is improved, but the power consumption increases
Solution Approach 1:
The supplemental alert generator uses periodic action by monitoring sound levels continuously but only performing full signal analysis when the sound level exceeds a predetermined threshold. This periodic analysis approach maintains high detection accuracy for legitimate alarm conditions while significantly reducing power consumption during normal operation, as the device skips detailed analysis during quiet periods.
Solution Approach 2:
The system performs preliminary threshold monitoring before initiating full signal analysis. By first checking whether the sound level exceeds the predetermined threshold, the device prepares for accurate analysis only when necessary, avoiding unnecessary processing and power consumption during normal operational periods.
3Duration of action of moving object
If the supplemental alert generator uses a high sound-level threshold to trigger analysis mode, then the battery life is extended, but the risk of missed alerts increases
Solution Approach 1:
The system dynamically adjusts the threshold parameter based on the operational context. A high threshold is used during normal operation to extend battery life, but the threshold can be modified or supplemented by additional monitoring parameters (such as duration of sound exposure or pattern recognition) to maintain reliable alert detection while preserving extended battery operation.
Solution Approach 2:
The system incorporates feedback mechanisms where the detected sound characteristics are continuously evaluated against the threshold and temporal patterns. This feedback loop ensures that legitimate alerts are not missed due to high threshold settings, as the system adapts its response based on the duration and pattern of detected sounds, maintaining reliability while extending battery life.
4Reliability
If the supplemental alert generator analyzes signal patterns in detail, then the false alarm rate is reduced, but the processing time and power consumption increase
Solution Approach 1:
The signal analysis is performed periodically only when the sound level exceeds the predetermined threshold, rather than continuously. This periodic analysis reduces false alarms by focusing detailed pattern recognition on significant sound events, while also reducing processing time and power consumption during normal operational periods when no alarms are present.
Solution Approach 2:
The system performs preliminary threshold checking before initiating detailed signal pattern analysis. This preliminary action filters out insignificant sounds that would require full analysis, reducing false alarm rates while minimizing the time and power resources spent on processing non-alarm conditions.
Data Source
AI summary
A battery-powered supplemental alert generator is disclosed that is adapted to be mounted in close proximity to, such as within 3 or 4 feet of, a conventional smoke, heat and/or fire detector/alert device. The supplemental alert generator operates in a relatively low power mode while listening for the nearby detector/alert device to generate a standard audible alert signal. Upon detecting that a monitored sound level has reached a particular threshold, the supplemental alert generator enters into a higher power analysis mode in which it analyzes the detected signal to assess whether it is an audible alert signal. If an audible alert signal is detected, the supplemental alert generator generates one or more supplemental alert signals, such as a 520 Hz audible square wave signal. The supplemental alert generator may be used to retrofit a house, hotel, or other building to comply with new standards or to otherwise increase the effectiveness of the existing detection/alert system.