Car Speed Via Doppler - Web-Based Speed Detection

🎯 How It Works

Upload audio recordings of passing vehicles to estimate their speed using the Doppler effect. When a car approaches, sound frequency increases; when it recedes, frequency decreases. Our advanced algorithms analyze this frequency shift to calculate vehicle speed.

⚠️ Educational Use Only: This tool provides rough estimates and is not accurate enough for law enforcement or precise measurements.

100%

Detection Success Rate

~11 mph

Average Error

30-200ms

Processing Speed

6/6

Test Files Analyzed

Choose Your Performance Mode

Maximum Performance

Fastest processing (30-100ms)
WebAssembly with SIMD optimizations
Best for production applications
Requires modern browser

🔬 Launch WASM+SIMD Demo

Balanced Performance

Good processing speed (60-200ms)
WebAssembly without SIMD
Works in most modern browsers
Recommended for general use

⚡ Launch WASM Demo

Pure JavaScript

Universal Compatibility

Reliable processing (100-500ms)
No WebAssembly required
Works in any ES6+ browser
Maximum compatibility

📝 Launch JavaScript Demo

🔧 Browser Requirements

WASM+SIMD: Chrome 91+, Firefox 89+, Edge 91+

WASM: Chrome 57+, Firefox 52+, Safari 11+, Edge 16+

Pure JavaScript: Any modern browser with ES6+ support

Audio Support: Web Audio API (supported in all modern browsers)

🎵 Sample Audio Files Included

Each demo includes pre-loaded test files recorded at known speeds:

23 mph vehicle pass
28 mph vehicle pass
30 mph vehicle pass (2 recordings)
33 mph vehicle pass
37 mph vehicle pass

You can also upload your own audio recordings to test!