Synchronizing Non-Symmetrical Alarm Cadences via Beacon CSI
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Solution Overview
Problem
Existing alerting systems face challenges in synchronizing non-symmetrical tonal patterns, particularly for long-duration temporal alarm patterns with time-varying duty cycles, which are impractical to synchronize using traditional methods.
Innovation Solution
A method involving a wireless beacon message with a Cadence Section Indicator (CSI) and synchronization pulses, allowing alerting devices to synchronize non-symmetrical tonal patterns by specifying the portion of the alarm cadence to emit at the next synchronization pulse, using a communication protocol with defined time slots and frequency hopping spread spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional synchronization methods are used for alarm patterns, then simple repetitive patterns can be synchronized, but non-symmetrical multi-second tonal patterns cannot be synchronized effectively
Solution Approach 1:
The alarm cadence is divided into multiple sections or phases (e.g., initial alarm phase, intermediate phase, final phase) with different tonal patterns. Each section can be independently controlled and synchronized, allowing the system to handle complex non-symmetrical patterns by breaking them down into manageable segments that can be transmitted and synchronized separately through the wireless network.
Solution Approach 2:
The system pre-defines multiple alarm cadence patterns (T3, T4, and custom patterns) with their specific temporal characteristics stored in the devices. When synchronization is needed, the appropriate pre-defined pattern is selected and its parameters (duration, pulse width, interval) are prepared in advance, allowing devices to quickly synchronize to the correct pattern without calculating it in real-time.
2Measurement precision
If beacon messages are transmitted frequently to maintain synchronization, then synchronization accuracy improves, but wireless network traffic and power consumption increase
Solution Approach 1:
Beacon messages are transmitted at regular periodic intervals rather than continuously or on-demand. This periodic transmission maintains synchronization accuracy by providing regular reference points for devices to align their alarm cadences, while the spaced intervals reduce power consumption and network traffic compared to continuous transmission. The period is optimized to balance synchronization needs with energy conservation.
3Stability of the object's composition
If alarm cadences are synchronized across distributed devices, then consistent notification is achieved, but coordination complexity increases for non-symmetrical patterns
Solution Approach 1:
A central coordinator device (such as a base station or gateway) acts as an intermediary that receives alarm requests, determines the appropriate alarm cadence pattern, and distributes synchronization commands to all distributed alerting devices. This intermediary handles the complex coordination logic centrally, simplifying individual device complexity while ensuring consistent alarm notification across the network through centralized control of the cadence synchronization.
Data Source
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AI summary
Method for synchronizing a non-symmetrical tonal pattern in a wireless alerting system involves receiving at a plurality of alerting devices a beacon message. The beacon message is used at the alerting devices to synchronously generate a synchronization pulse signal comprised of a plurality of synchronization pulses which are periodic in accordance with a predetermined synchronization pulse interval. A cadence section indicator (CSI) in the beacon message is used in combination with the synchronization pulse signal to determine a portion of an alarm cadence to sound at each of the alerting device so that the alarm cadence is synchronized among the plurality of the alerting devices.