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You are here: Home / Topics / dtmf tones generation

dtmf tones generation

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Electronics › Electronics › dtmf tones generation

  • This topic has 6 replies, 5 voices, and was last updated 14 years, 5 months ago by Engr. Mansoor Mirza.
Viewing 7 posts - 1 through 7 (of 7 total)
  • Author
    Posts
  • September 11, 2010 at 3:19 pm #407
    Anonymous
    Guest

    In DTMF(dual tone multi frequency) generator ic the two frequencies are mixed in appropiate way and a DTMF tone is generated.

    Can the DTMF tones can be generated from two individual frequencies, OR how to mix the frequencies to produce a DTMF tone, what is the appropiate way to mix the frequencies.

    September 13, 2010 at 1:41 pm #5055
    raj
    Participant

       In which purpose we are using it

    September 14, 2010 at 2:58 pm #5057
    Anonymous
    Guest

    did u try mixing two frequencies directly? 

    October 12, 2010 at 6:37 am #5090
    Murat diindar
    Participant

    i think this link may be helpful for you….

    http://www.sunrom.com/files/1218-datasheet.pdf

    December 11, 2010 at 7:28 am #5205
    Anonymous
    Guest

     use a dtmf encoder IC 8870.

    December 13, 2010 at 8:51 am #5211
    SUNIL KUMAR. R
    Participant

    Hi,

     

    8870 is not a DTMF encoder , Its a DTMF DECODER.

     

    I have tried MT8880 and it worked awesome.

    Its even easy to generate the dtmf tones..

    Just by applying different binary combinations to the data pins u can generate various dtmf tones.

    8880 also acts as a decoder.

    Thats why the 8880 IC is called as DTMF TRANSCEIVER. ( TRANSMIT + RECEIVE )

     

    For generating the binary code words u can go for the following methods :

    1.Use a microcontroller to generate the bits.

    2.or try some logic circuits.

    3.or just set the bits high or low by directly the data pins to the power supply(logic 1) or to the ground (logic 0).

     

    Hope this helps.

     

    Linus.Robotique

    December 25, 2010 at 1:29 pm #5270
    Engr. Mansoor Mirza
    Participant

     

    you can generate DTMF signal from you PC using Visual Basic and can also generate using 8051… see this link

     

     

    http://www.8051projects.net/downloads36.html

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