The Dual-tone multi-frequency signaling Android decoder.

The aplication recognise tones it steps:

• capture sound from the microfone,
• transforme it using Fast Fourier Transform (thanks to https://introcs.cs.princeton.edu/java/97data/FFT.java.html),
• do additional clean-up to reduce noices,
• find picks on the frequency spectrum,
• put the reconised number into the text field.

The project was exported from https://code.google.com/p/dtmf-decoder to make it simpler to look through or fork.

Code license: GNU Lesser GPL.

It was created for Android 2.2.3 (Froyo).

The project is no longer maintained.