Some articles on dtmf decoder, dtmf:
Internet Radio Linking Project - Requirements - IRLP Hardware
... The most difficult part being the DTMF decoder which consists of a MT8870 (or similar) DTMF decoder IC and HCF4081 (or similar) and-gate IC ... pins 10,12,13,15 in order to acknowledge a DTMF digit ... MT8870 pin 15 provides a pulse when any valid DTMF digit is decoded, so this signal is used on one input of each gate on the HCF4081 ...
... The most difficult part being the DTMF decoder which consists of a MT8870 (or similar) DTMF decoder IC and HCF4081 (or similar) and-gate IC ... pins 10,12,13,15 in order to acknowledge a DTMF digit ... MT8870 pin 15 provides a pulse when any valid DTMF digit is decoded, so this signal is used on one input of each gate on the HCF4081 ...
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