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PCM designs

Discussion in 'Electronic Design' started by [email protected], Apr 11, 2007.

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  1. Guest


    I'm working on a project which requires me to design and construct a
    pulse code modulator for voice. I need to find out the different ways
    possible for implementing this. Please I need information on this.

    Ope Odeleye
  2. Rich Grise

    Rich Grise Guest

    1. Find a PC that will still run DOS.

    2. Lash up a mic preamp and comparator, to square up your voice waveform.

    3. Hook the comparator output to the printer port interrupt.

    4. Every time there's an interrupt, save the timer's current count,
    and reset the timer. Save these values to a file.

    To playback, write a timing loop that takes the time values recorded
    in step (4) above, and toggle the computer speaker on each transition.

    Good Luck!
  3. joseph2k

    joseph2k Guest

    There are more ways to do it than i can successfully enumerate. Find and
    pick a few and then you can ask about choosing among them.
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