Minor Project (DTMF Decoder)
This DTMF(Dual Tone Multi Frequency) decoder circuit identifies the dial tone from the
telephone line and decodes the key pressed on the remote telephone. Here
for the detection of DTMF signalling, we are using the IC MT8870 which is a touch tone decoder IC. It decodes the input DTMF to 4 digital
outputs. The MT8870 DTMF (Dual Tone Multi Frequency) decoder IC uses a
digital counting technique to determine the frequencies of the limited tones
and to verify that they correspond to standard DTMF frequencies. The DTMF tone
is a form of one way communication between the dialler and the telephone
exchange. The whole communication consists of the touch tone initiator and
the tone decoder or detector. The decoded bits can be interfaced to a computer or microcontroller for
further application (For example, Remote control of home/office electrical appliances using a telephone network, Cell Phone controlled home
appliances, Mobile phone controlled robot, etc.)
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