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Hans-Boeckler-Strasse 16
63263 Neu-Isenburg/ Germany
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DTMF Encoder PDF

DTMF Encoder

DTMF transmit by GSM module
In PSTN applications dedicated telephony circuits are used to generate DTMF (for example, MT8880). On the other hand, a microprocessor can do it, too.

With GSM modules it is much easier. Just send one AT command AT+VTS=X and generate correct tones via software. AT+VTS=1 generates the DTMF tone 1 for 100 ms.
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