uguntde

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About uguntde

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    Senior Member

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  • Website URL
    https://www.birmingham.ac.uk/staff/profiles/cancer-genomic/gunther-ulrich.aspx

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    Male
  • Location
    Birmingham UK
  • Interests
    Science, NMR, string instruments

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  1. uguntde

    Arpeggione Help!

    https://simpk.de/arpeggione_790.html They say it is tuned E-A-d-g-h-e' as a guitar (h=b). Here a blog about it: http://arpeggione2009.blogspot.com/2009/08/arpeggione-stauffers-model.html And wikiedia also has the information about the tuning https://de.wikipedia.org/wiki/Arpeggione according to which the only old piece is that by Schubert but since a copy of an Arpeggione was made some more have been written for it (probably transcriptions). This is what it sounds like: Intonation isn't great.
  2. uguntde

    Arpeggione Help!

    That's "Anleitung zur Erlernung des von Hrn. Georg Staufer neu erfundenen Guitare-Violoncells" = Instructons to learn the guitar cello that was invented by Mr Georg Staufer.
  3. uguntde

    Arpeggione Help!

    Is there any piece beyond Schubert's sonata that was written for the Arpeggione? Apparently the instrument had disappeared by the time Schubert had written it.
  4. uguntde

    Frequency analysis violas

    There is this article, www.jpschmidtviolins.com/Violin_Acoustics_2.pdf which I think is by Don Noon, our fellow maestronetter. It refers to this average table in the Strad for the 'key modes' of Stradivarius violins (I attached a screen shot of the spread sheet). I wonder whether anything along these lines exists for violas. What viola sound are we looking for? I know what I like, they must not be 'nasal', I like a strong C-string, I like it if they also have an edge in the upper strings (whatever this means). I have hardly every seen a viola at an auction that I liked.
  5. uguntde

    Frequency analysis violas

    I am trying to get the higher frequencies - they depend a lot on the environment, one almost needs a sound isolated room - which I do not have. Any laptop fan in the background will add a signature. Higher frequencies from from frequency modulating power supplies (dimmable LEDs etc) all add to that sound spectrum. I work a lot with frequency analysis in science (I do something called NMR) and we would not accept a signal that does not have a signal to noise ratio of around 5 and is clearly reproducible.
  6. uguntde

    Frequency analysis violas

    Thanks for this detailed response.
  7. uguntde

    Frequency analysis violas

    Usually for violins only frequencies below 600Hz seem to be considered for A0, B0, B1, B1+ http://www.catgutacoustical.org/research/articles/modetune/modechrt.html Schleske looks into the noise at higher frequencies but then one needs a more dampening window function. He also reads a lot out of some noise: http://www.schleske.de/en/research/introduction-violin-acoustics/sound-analysis.html One should average these signals, this is what we do in my field, NMR spectroscopy. We ust average equal signals until S/N is stronger. The type of frequency analysis is similar (except that you can't get a complex signal, i.e. two orthogonal signals, from a violin). Schleske also plots the x-axis chromatically, which I assume means log2 scale, as any double frequency is an octave. Audacity can't do this, but I can use matlab if I can figure out how to fft a signal that is not complex (i.e. of two rectangular channels). Maybe a HIlbert transform and then a power calculation? All this has been figured out before but is not well dcumented anywhere. At least I can't find it. My fundamental question is which resonances should be strongest for a good sounding viola.
  8. uguntde

    Frequency analysis violas

    Above 1400 it is mainly noise. But I can post it tomorrow. The dynamic range of my setup is limited. I used a Zoom USB mic and switched off all autoscaling etc.
  9. uguntde

    Violin ID

    Guaranteed not Blanchard. Kind of from he opposite side of the spectrum.
  10. What do you use to colour your varnish? Will you apply a layer with more colour?
  11. uguntde

    Merry Christmas everyone!

    Same for you all!
  12. uguntde

    Testore cello?

    What does this tell us about you Martin? This means you might be able to identify it as it is not, but as it is not you are also happy to say so. And it is easier to identify it as not being a Testore than otherwise?
  13. uguntde

    Frequency analysis violas

    I am trying to understand some frequency analysis of instruments, and wonder whether some of the experts here could give me some hints. Number 1 is a spectrum generated using Audacity with strings muted, by knocking on the bridge. Major frequencies are: 231Hz – largest/ widest peak overall Shoulders at 203 and 259Hz 321 Hz 374/385Hz 453Hz – as large at 231Hz – about 2*231Hz 489Hz 534Hz (with shoulder to the left) 566Hz - 591Hz - 636Hz - 665Hz - 713Hz - 781Hz - 817Hz - 873Hz - 945Hz - 977Hz Could someone help me assign what is what? This is a 402 body length viola, nicely resonant, very good C string, well balanced sound with an interesting edge to it. Here another instrument: 210Hz Shoulder at 245Hz 342Hz 417Hz/447HZ 480Hz 592Hz - 567Hz - 594Hz - 636Hz - 661Hz - 714Hz - 781Hz - 821/ 851/ 867Hz - 941Hz This is a 41.6cm body length viola, very strong dark sound, extremely resonant on the C string, very large powerful sound. The better of the two, but the first one is also very new. I am trying to learn and hope some of you have the patience to look at this: What is B1, B1+, what are the other frequencies? Which sould would you predict from this analysis? Can provide a sound sample should someone be interested. I can later add some simpler Chinese instrument.
  14. uguntde

    Violin I/d - French or German?

    I agree that this is not a JB Collin, the varnish is completly different, and the underground untreated (dirty borwn where the wood comes through). But the fingerboard of the Bridgewood and Neitzert violin is also untypical as Mirecourt makers always rounded the corners of the fingerboard.