MATLAB demo scripts accompanying the ACM MobiSys 2026 paper:
[Emerging Ideas] Phonotonos: Through-Skin Ultrasonic Blood Flow Sensing Using Smartphones

📌 For the most up-to-date code, issues, and ongoing development, please visit the official repository:
https://github.com/Phonotonos/Phonotonos

To run the demo:

1. Install MATLAB R2025a or later
   • Required toolbox: DSP System Toolbox, Signal Processing Toolbox
2. Navigate to the demo folder and run:

EndToEndDemo/main.m

This script provides a full end-to-end demonstration of the system, including:

• Preprocessing
• Single-bin DFT for phase-based Doppler estimation
• Signal quality score calculation for locating artery
• Non-linearity cancellation using virtual feedforward microphone
• Baseline estimation and removal using BEADS algorithm
• Doppler indices calculation

Due to IRB restrictions, we are unable to share data collected from study participants.

However, we provide a sample recording for testing and demonstration:

• DataExample/sample.wav (Recorded by one of the authors)

• Open an issue in this repository for bugs or feature requests
• Or contact the paper authors directly via email