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Yes, I misspoke - I should have said "representation in sound", not detection. But what Andy said, all of that.
> Date: Mon, 5 Jan 2015 11:45:51 +0000 > From: akbutler@tiscali.co.uk > To: Loopers-Delight@loopers-delight.com > Subject: Re: guitarists: triple play? > > > > On 05/01/2015 09:35, Diarmuid Pigott wrote: > > > My own experience of MIDI from strings is that the detection of vibrato and bend and gliss is pretty much > > dependant on the MIDI instrument I am using. > > I think there's a bit of a miss-conception going around. > > The Midi instrument actually has nothing to do with detection, > it only responds to midi commands. > By then the detection is already done. > What *is* important is that the Midi instrument needs to respond > correctly in order to interpret the pitch information correctly. > i.e. the amount of pitch change in response to MidiPitchBend has to be set correctly. > That's actually rather trivial to set up, as long as the midi instrument supports it. > > For a device like the Fishman the situation is a bit different, in that > there may be processing of the audio from the pickup. > In that case it's obviously possible to pass the audio in some form and > get what seems like "perfect tracking", when no tracking has been needed. > > For note detection there's an absolute limit that's never going to be beaten. > I look at it from a slightly different angle to the usual idea of note frequencies. > The impulse from plucking the string has to travel up to the fret and back to the pickup > before it's possible to calculate which fret was used. > > Using that way of looking at things the Axon system can make a the quickest possible > guess at what the note played is, then it uses a more regular analysis to measure > the frequency. Should the initial guess be wrong a correction is made to the Note-On > that was sent using MidiPitchBend. > As the Axon system is patented then it kind of looks like no-ones going to get > faster tracking without licensing it. > > Warbling on a sustained note occurs when the fundamental of the note fades before the harmonics, > so on some instruments there'll be one or two notes that warble every time. > Just down to the resonance of the instrument. > If the instrument is specially designed to work with midi convertion I suspect > they spend a lot of time working removing any 'bad notes'. > > If there's going to be any improvement over the Axon system it won't > be in fast detection of the note, but rather in the ability to > keep tracking a note as it dies away. > > > andy > ps. for playing around, the monophonic devices by Sonuus have somewhat slower note > detection but are fairly warble resistant. > > > > > > > |