• Background: Touch Tone Dialing, invented by AT&T makes use of two signaling tones to indicate the numbers dialed by users in the system.  This system is called dual tone multifrequency (DTMF).
• Obviously, to determine the numbers that have been dialed requires determining which frequencies are present.  The heart of a decoding system for DTMF is filtering.
• Description: A phone-like DTMF tool with GUI using several methods, FFT, Goertzel and filter banks. This software implementation is designed on MATLAB environment.
• Objective: to create a digital DTMF encoder and decoder in MATLAB.
• Environment : MATLAB

DTMF_keypad_frequency_table

Solving telephone number from generated DTMF file from project developer on Vimeo.

Generating a DTMF signal on MATLAB interface from project developer on Vimeo.