Re: [PD] Helmholtz Motion Verifier

2010-12-12 Thread Andy Farnell
A job for spectral tools I would guess. At the point spectral flux hits a first minimum and autocorrelation hits a first maximum, the string will be in stable resonance. You could use something fast like bonk or a schmitt trigger to time those from the onset and get a measure of "how well" the no

Re: [PD] Helmholtz Motion Verifier

2010-12-11 Thread Collin Oldham
Interesting idea! Might be a good idea to use a pickup, since the body resonances of the instrument will smear the helmholtz motion from the signal a bit if you use mic. Regarding your second question: There will be no phase lock across 2 strings, which is why it is possible, and even likely, t

Re: [PD] Helmholtz Motion Verifier

2010-12-11 Thread Ludwig Maes
And a different question: Just like how the different non harmonic partials are shifted and forced into a harmonic compromise in a bowed string, does something similar happen when playing simultaneous harmony? I.e. would partials on 2 strings sharing bow and bridge, say fingered at a frequency rati

[PD] Helmholtz Motion Verifier

2010-12-11 Thread Ludwig Maes
How would one (and how hard or easy would it be) write a patch which does the following: Instruct the user to play a sustained note on the violin; then give feedback about how accurate Helmholtz motion is achieved; Could we measure how short the transient takes from nonHelmholtz motion to helmholtz