This program allows you to monitor for incoming DTMF tones while in a phone conversation. When the caller/receiver (either cell or land line) wants to give you a phone number simply start the program and tap the button start the decoder. The program scans the phones audio in real time for DTMF digits and symbols and displays them in real time. The DTMF audio decoder is based on the 'Goertzel Algorithm'.

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To run these Pocket Visual Basic programs you need the free Microsoft Distribution Source Files located at




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(c)1998-2017 Vincent Collura ( Inventor / Engineer )