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How do I find a chip?

Discussion in 'Electronic Basics' started by SonOfSofaman, Oct 9, 2003.

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  1. SonOfSofaman

    SonOfSofaman Guest

    I'm hoping to find a chip that I can use to generate simple musical
    notes. I can live with simple square or sine wave tones, but would
    love to find something that does selectable voice timbre synthesis (FM
    synthesis?). A MIDI chip would totally be the thing I think. I need
    something that I can drive from a microcontroller and it needs to
    support multiple simultaneous notes (chords).

    I've tried searching Google but I'm not even sure what to search for.

    Can anyone A) suggest a part that does what I am looking for, or B)
    give me a suggestion what to search for? I'm happy to do the research
    (half the fun!)

    TIA

    - Joel
     
  2. This might interest you:
    http://www.fee.vutbr.cz/~arnost/opl/opl3.html

    michael brown
     
  3. Steve

    Steve Guest

    Can't help you with the synthesis, but a simple solution for square
    wave tones is a PICAXE. It's basically a PIC micro with bootstrap
    code pre-loaded. The idea is that it's simple to write and upload
    programs. They have some pretty cool features, one of which is the
    command "SOUND" which automatically generates a square wave output.

    the sytax is; SOUND pin,(note, duration, note, duration...)

    notes can be any value fro 0-255. 0 is silent, 1-127 are tones,
    128-255 are white noise.

    duration is also 0-255, multiples of 12ms.

    a simple program that just beeps once might be;

    main:
    sound 0,(100,100)
    end

    check out the PICAXE system here; www.picaxe.co.uk

    nifty
     
  4. JeffM

    JeffM Guest

    That will give you the 2^-12 intervals
    and they (organ manufacturers) use flip-flops to give octave intervals from there,
    but TOGs don't do any wave-shaping.
     
  5. --------------
    Speech synthesis isn't that hard to do analog using a micro to control
    it, if you're interested. Search on "Voder". Or email me, I have
    collected a bunch of projects.

    -Steve
     
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