new to the forum project

Discussion in 'General Electronics Chat' started by bruce35, Aug 4, 2010.

  1. bruce35

    Thread Starter New Member

    May 16, 2008
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    hello everyone I am graduating with my associates degree from itt tech in September have been into engineering and electronics since i was about fifteenth i am in my final semester and i would like to design a electronic circuit that takes the phone tones from your basic land line phone and converts them to there Fourier transforms and then to the numbers as a homemade caller id question 1 does anybody think this will work do how would you go about implementing it suggestions are welcomed :D
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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  3. Syniva

    New Member

    Jun 21, 2010
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    I once wrote some software to decode CallerID from a sound card in a PC, after searching the internet failed to turn up any ideas of how to demodulate the signal in hardware.

    http://www.ecstaticlyrics.com/electronics/telephone/CallerID/

    I still haven't been able to think of a way to do it electronically, short of using a microcontroller with an ADC, but that's software again. ...but the algorithm is rather simple, since it takes a shortcut rather than perform a real Fourier transformation, and so I imagine it is possible to implement it in a microcontroller. You can also leave out the two square root functions since the two values are just compared to each other afterwards.
     
  4. bruce35

    Thread Starter New Member

    May 16, 2008
    7
    0
    thank you for the suggestions they were very helpful there is still so much i have to learn when i get it done will take a picture and put it on with schematics thanks again
     
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