ECHO Safety Node
A privacy-preserving, on-device acoustic safety system designed for real-world school deployment.
Core Capabilities
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Real-time detection of safety-relevant acoustic events
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On-device inference with no cloud dependency
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Zero audio retention by design
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Low false-alert operation suitable for continuous use
Technical Specifications
Hardware
• Form factor: Compact, wall-mounted enclosure
• Dimensions: Smoke-detector class
• Power: Continuous low-power operation
• Processor: Low-cost edge compute (Raspberry Pi–class or equivalent)
• Microphone: Embedded acoustic sensor (non-directional)
Processing
• Inference location: Fully on-device
• Model type: Lightweight acoustic event classifier
• Feature extraction: Non-semantic time–frequency features
• Latency: Sub-second end-to-end detection (median <500 ms)
Installation & Deployment
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Installed high on walls in camera-restricted areas
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Single-device coverage per defined zone
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No cloud infrastructure required
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Minimal network configuration
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Designed for long-term continuous operation
Typical installation time: under one hour
Detection Scope
Detects
• Impact or fall-like events
• Sustained distress patterns (e.g., prolonged crying)
• Repeated physical scuffle-like sounds
• High-energy impulsive events relevant to safety
Explicitly Does Not Detect
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Spoken content or language
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Individual identity
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Conversations or verbal meaning
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Emotional state or intent