serial communication using the audio frequency

Discussion in 'The Projects Forum' started by edski, Sep 22, 2010.

  1. edski

    Thread Starter Member

    Sep 22, 2010
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    can anyone help me.. pls..thanks
     
  2. t06afre

    AAC Fanatic!

    May 11, 2009
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    Analog Modems or modems used on phone lines used(and still use for that matter) such a technique. I am somewhat rusty on such devices. but try google and the terms "analog modems", or "voiceband modems"
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
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    To be really literal about that, human speech is the leading example of serial communication at an audio frequency.
     
  4. Papabravo

    Expert

    Feb 24, 2006
    10,140
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    You can also google FSK - Frequency Shift Keying. In this technique a bit cell can be divided into three parts. A zero is a frequency change at the one-third point of the bit cell and a one is a frequency change at the tw-thirds point of the bit cell. The two frequencies are non harmonically related and have a large value for their least common multiple.

    http://en.wikipedia.org/wiki/Frequency-shift_keying
     
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