DTMF detection through microcontroller

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kumarkummi

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hi everyone

i want to decode the DTMF tones through micro controller with out using an external DTMF decoder hardware ic and low cost. please help me.
 

You have to implement the Goertzel Algorithm for DTMF decoding. Here is a microcontroller based project with schematic and full source code: **broken link removed**
 

HI

please tell me any hardware requirements for decode the tones using microcontroller
 
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