matt-mekha / HRTF

A simple Head-Related Transfer Function demo made in Kotlin that allows you to hear sounds with direction and elevation just using stereo headphones.

HRTF Demo

A simple Head-Related Transfer Function demo made in Kotlin that allows you to hear sounds with direction and elevation just using stereo headphones.

Details

• Frequency scaling based on the following variables: frequency, which ear, azimuth, and elevation.
• Distance-based attenuation following the inverse square law.
• Interaural time differences to simulate the speed of sound.

Features

• Maximum of 1024 sample latency (about 22ms excluding any OS delays).
• Can process frequencies of up to 22050 Hz.
• SOFA file support for HRTF decoding.
• Wave and MP3 file support for audio testing.

Try it yourself

1. Download this JAR (from the latest release) and run the following command in the folder it's in:

java -jar HRTF.jar

2. Select a SOFA file (see this repo's test-resources/HRTF folder or this database for examples).
3. Select an audio file (see this repo's test-resources folder for examples).
4. Press Run Demo and listen with headphones!

Credits

• NetCDF Java for decoding the SOFA files.
• Badlogic Audio Analysis for the Fast Fourier Transform implementation in Java.