Perceptually Adaptive Alarm Systems Using Doppler-Based Pitch Modulation

This technical note presents a novel alarm system design that uses Doppler-based pitch and amplitude modulation to help people better understand emergency situations through sound alone. By embedding intuitive rising and falling pitch cues into familiar alarm tones, the system conveys urgency, direction, and safety — even through walls, smoke, or in unfamiliar environments. It is designed to support everyone, including those with hearing or visual impairments, and works alongside existing fire, hospital, or building alarms without needing new hardware. The system adapts to real-time sensor data (e.g. heat, smoke, gas), allowing alarms to reflect the severity and location of danger. It also includes digital watermarking so each alarm tone carries a unique identity that can be decoded remotely, such as through a phone microphone. This document shares the design openly to establish prior art, prevent enclosure, and support inclusive safety innovation in public and private spaces.