• Dial Tone, ring back tone Generation
    How i can generate these tones from the controller and make controller to suply tones to all sets in case all telephone sets goes off-hook.. I know i have to make a delay of 400Hz for Dial Tone , for...
  • dtmf decoding
    hey!! i am trying to decode a DTMF tone by using a decoder chip then i send it to the microcontroller at89s52 and then display the output in the lcd but when the key on the telephone set is pressed...
  • DTMF IC
    You can use HT9170B or MT8870 as DTMF decoder IC with 8051.
  • Dual tone multi frequency
    hi please suggest me a good dtmf chip compatible with 89c51. thanks in advance
  • Verifying DTMF Algorithms
    Hello My goal is to create an application that recognises DTMF signals using a ARM7 uC (I have LPC2368). After looking over background theory (DFT) and after studying several code examples for...