![]() ![]() ![]() Either line- or microphone input jack is used. “Live” tone signals are fed from telephone line or radio into soundcard of computer. DTMF is used by most PSTN (public switched telephone networks) systems for number dialling, and is also used for voice-response systems such as telephone banking and sometimes over private radio networks to provide signalling and transferring of small amounts of data. ![]() The signal is encoded as a pair of sinusoidal (sine wave) tones from the table below which are mixed with each other. DTMF Decoder is also used for receiving data transmissions over the air in amateur radio frequency bands. DTMF Decoder is a very easy to use program to decode DTMF dial tones found on telephone lines with touch tone phones. ![]()
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