Dual Tone Multi Frequency (DTMF) - Signal Identification using Wolfram Mathematica
DTMF Decoder
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Choose the audio-input-device which can be:
a) just the microphone of the PC/laptop or any external micrpphone In that case, the code captures and decodes (e.g.) mobile-phone dial tones over the air.
b) output of a software defined radio application such as Gqrx SDR or CubicSDR The audio output of the SDR application is required to be set as a virtual audio input device.
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After coosing the device, click "OK" button to run the rest of the code and let the visual part appears.
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Click start button, which activates the input device and start real-time processing.
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Test by dialing a number with a mobile phone and it should be captured and displayed realtime dynamically.