guitar signal data

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by hogie, Dec 16, 2004.


  1. hogie

    hogie Member

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    Dec 14, 2004
    Not sure if this is the right section to post in or if anyone on here can even help me out, so here goes nothing....

    So I was thinking about trying to simulate guitar effects using Matlab. Does anyone have any guitar signal data that I could use or know how I could create my own dataset (ie: a link to a site with p-p voltage, frequency range, #harmonics)?

    I don't have easy acess to an oscilloscope right now, otherwise I'd go measure myself.
     
  2. hogie

    hogie Member

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    Dec 14, 2004
    thanks! exactly what i was looking for.

    has anyone here ever designed/simulated guitar effects using matlab or something else before?
     
  3. Neon

    Neon Member

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    Oct 30, 2003
    Location:
    Sacramento, CA area
    Hogie,

    A guitar signal has a lot of harmonic content in it. So that low E, around 82.4Hz, will have plenty of energy at 82.4*n (n=1,2,3,.., ?). Of course, the harmonic content changes from string-to-string, fret-to-fret, etc. I'm sure you get the picture. Unfortunately, I don't have any specific examples of the harmonic content.

    I have seen rudimentary spectrum analysis built into some audio editing software. This might help you get a better feel for the spectural content of the guitar signal. I know this isn't too specific, but it could get you started.
     
  4. TheAmpNerd

    TheAmpNerd Member

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    Location:
    Tejas
    Great Technical stuff you guys. : )

    Can anyone answer this, I've kinda wondered about it.
    Why are most guitar amps limited to 5-6k by the speaker
    and typically don't have horns, tweaters, etc?

    I know the harmonics and higher register stuff
    are present in the guitar aren't they?

    I recall reading about Steward Hegman when he was
    designing amps and was going way beyond the
    20 - 20,000 Hz because he said the research showed
    that even though people can "hear" it, they sense the
    higher frequencies typically chose speakers/amps
    etc with much extended range beyon 20,000 Hz,
    though they didn't know why.

    Would it make sense therefore to build a guitar amp
    that went to say 15,000 to 20,000 Hz, even though
    the guitar doesn't go that high?

    Anyone look into this?

    I'm curious about this.

    Now I'm going to go find a jam and play.
     
  5. Wakarusa

    Wakarusa Member

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    May 7, 2004
    Location:
    Newnan, GA
    Experiment for yourself. Jack your guitar directly into your stereo with the nice full-range speakers and full range pre-amp.

    All the extra content doesn't (to my ears at least) sound very good.
     
  6. TheAmpNerd

    TheAmpNerd Member

    Messages:
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    Sep 23, 2004
    Location:
    Tejas
    Trying, but I'll have to rig something to get a good
    connection in that old 35w Marantz amp.

    Let me open it up and see the best spot to mount a
    1/4 jack....

    There we go, right up front where it should be,
    just off to the left of the center Marantz logo.

    Too bad that amp is an ugly pink color, I'll cover it in
    West Tejas Rattler.

    This will be fun.
     
  7. glasman

    glasman Guest


    Take a look back in time on the use of Horns and guitar rigs.

    Remember the VOX AC50's and AC100's (and the SS Super Beatle). Their matching cabinets all had horn tweeters mounted.

    How about the old Acoustic series of guitar amps with the Horn on top of the two 15's.

    Ahhh the good ol' days.

    But in todays world most bass players (myself included) would not think of doing a gig without a minimum of a 2 way system(there are also 3 and 4 way cabinets for bass).

    Back to building boards......
    Gary
     
  8. fullerplast

    fullerplast Senior Member

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    May 5, 2003
    Recognize this rig? Six Wurlitzer horns!:eek: :D

    [​IMG]
     
  9. glasman

    glasman Guest


    No, but a quick search revealed it definately belongs in the Rock and Roll hall of fame. Quicksilver was one of my favorite bands of that era!!

    This way off thread.... Remember the Farfisa "Brasso" horn. Think it was Farfisa that built it.... and I think it was called the Brasso.

    So many years and so many beers later......

    Gary
     

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