# Simple DTMF Decoder in C

Simple stupid code implementing [Goertzel algorithm]

[Goertzel algorithm]: https://en.wikipedia.org/wiki/Goertzel_algorithm


# Build

Under Linux

    cmake -S . -B build -G Ninja
    ninja -C build
    arecord | ./build/dtmf


# Test

You can use your phone dial pad or online signal generator https://onlinetonegenerator.com/dtmf.html