DIY - DTMF Tone Generator and Decoder Circuits
DIY - DTMF Tone Generator and Decoder Circuits
The given project describes how different DTMF tones can be generated using DTMF tone generator chip 91214B and how these tones can be decoded by DTMF decoder chip MT8870 that generates 4-bit digital output.Using these two circuits together one can build DTMF based remote control application in which 91214B chip is used as remote control and ...
engineersgarage.com2021年6月9日
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The input is the audio file, while the output should be the number.A dual-tone multi-frequency (DTMF) system is used to produce signals that represent the dialed digits in a telephone system. A combination of a horizontal frequency and a vertical frequency is produced whenever a button is pressed on the keypad. The figure below shows a telephone keypad and the different frequencies used.1209 Hz1336 Hz1477 Hz697 Hz123770 Hz456852 Hz789941 Hz#0?Generate the DTMF tone decoder that will take an audi
The input is the audio file, while the output should be the number.A dual-tone multi-frequency (DTMF) system is used to produce signals that represent the dialed digits in a telephone system. A combination of a horizontal frequency and a vertical frequency is produced whenever a button is pressed on the keypad. The figure below shows a telephone keypad and the different frequencies used.1209 Hz1336 Hz1477 Hz697 Hz123770 Hz456852 Hz789941 Hz#0?Generate the DTMF tone decoder that will take an audi
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