Stumac's Research Project

Discussion in 'Trumpet Discussion' started by Sethoflagos, Mar 30, 2015.

  1. stumac

    stumac Fortissimo User

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    Hi Seth, a water manometer was what I was going to use till I remembered the gauge I had in storage left over from my days of repairing and calibrating. Your results reasonably accord with mine, lots more work in future. I do not think many people would have a $4000 gauge lying around the house.

    Mark, the idea is not mine, just trying to reproduce what I read somewhere that Arnold Jacobs said "That the blowing pressure doubles for each octave".

    My next investigation will be with a sound level meter to get an idea of pressure verses loudness. Peter Kartu of the Tres Mambo Music school has postulated "That if one can blow 6 discreet levels of sound then one can play 6 harmonics, 8 sound levels, 8 harmonics etc". He bases this on the work of Fletcher and Tarnofsky Physics dept University of New South Wales. I wont get to this until towards the end of next month.

    Regards, Stuart.
     
  2. Sethoflagos

    Sethoflagos Utimate User

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    Which implies that a graph of lung pressure versus frequency will be a straight line through the origin. My data concurs. (do you have the original published paper, Stuart?)
     
  3. stumac

    stumac Fortissimo User

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    The Arnold Jacobs quote I think is from his book "Wind and Song". The Fletcher paper I will try to get a link.

    Regards, Stuart.
     
  4. tjcombo

    tjcombo Forte User

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    Looking forward to seeing results of pressure vs pitch vs volume Stuart and Seth. Gut feel is that apparent linearity of the graph lacks meaning without the sound level being measured - given the inaccuracy of our ears in measuring small changes in volume.
     
  5. stumac

    stumac Fortissimo User

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    tj,

    my initial experiments were to see what the minimum blowing pressure was to just sustain a note, my next will be with a sound level meter, will be later next month after I return from the China trip with the Orchestra.

    Regards, Stuart.
     
  6. Sethoflagos

    Sethoflagos Utimate User

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    Measuring absolute acoustic power is a bit of a fiddly business, but as a general guide, I added (my estimate of) mezzoforte and fortissimo levels to the presumed pianissimo measurements I took last night.

    [​IMG]

    I should add as a proviso that at the moment my dynamic control above above the stave is not quite perfect and the ff high C is pretty near my humble limitations.

    Roughly speaking, mezzoforte seems to correspond to pianissimo of the next partial up, and fortissimo, two partials.
     
  7. Dr.Mark

    Dr.Mark Mezzo Forte User

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    Hi Sethoflagos,
    Yes numbers make it look better but I have to admit, if I had a nickle for every research paper that used BS data or a BS statistical process (especially in behavioral sciences), I'd be rich.
    I have a basic saying that goes like this:
    BS in = BS out. Make your data and your process as clean and current as possible and the rest should take care of itself.
    Dr.Mark
     
  8. Vulgano Brother

    Vulgano Brother Moderator Staff Member

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    Are you using C,G,c,e,g,c?
     
  9. veery715

    veery715 Utimate User

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    Good heavens!! The lengths to which we will go to avoid practicing!!! You guys probably have clean houses, no dishes in the sink, manicured lawns, full bird feeders, the list is endless. What a sick bunch!!
     
  10. Dr.Mark

    Dr.Mark Mezzo Forte User

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