DTMF Decoder is a very easy to use program to decode DTMF dial tones found on telephone lines with touch tone phones. DTMF Decoder is also used for receiving data transmissions over the air in amateur radio frequency bands.

The signal is encoded as a pair of sinusoidal (sine wave) tones from the table below which are mixed with each other. 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.

“Live” tone signals are fed from telephone line or radio into soundcard of computer.  Either line- or microphone input jack is used. It is highly recommended to ensure galvanic decoupling between PC and telephone line or radio receiver.

Limitations:

· 15 days trial