[Smt-talk] accellerandi-pieces

[Thomas Noll]

I wonder wether the "discernable strands of the musical texture"  are  
a consequence of the pitch treatment in Christobal's example, – which  
is extrinsic to "the idea" I mentioned – or wether it is also(!) a  
consequence of the radical slow-down. It think it would be nice to  
make more experiments...
best wishes
Thomas Noll

Am 15.10.2009 um 15:09 schrieb Justin London:

> This is a nifty idea, but I don't think it works.  For the  
> periodicities one tracks in the ritardando illusion are  
> invidividual, discernable strands of the musical texture (so to  
> speak), as these stream separately from the other periodicities at  
> different rates in different registers.  Whereas in the case of the  
> shepherd tones, the components tend to fuse into a single tone  
> percept, which enables the illusion.
>
> Best,
> Justin London
>
> On Oct 15, 2009, at 1:42 AM, Thomas Noll wrote:
>
> Dear colleages,
> with students in theory class we have been working on the idea of an  
> infinite accellerando (or ritardando) in analogy to the illusion of  
> infinite ascend (or descend) in pitch height in the Shepard scale  
> (or glissando). The solution we came up with is a combination of
> (1) a non-periodic self-similar rhythm (such as investigated by  
> Norman Carey and David Clampitt in their 1996 PNM article: "Self- 
> similar pitch structures, their duals, and rhythmic analogues"),  
> which is played simultaneously at several speeds, where "old" levels  
> fade out and new levels fade in through a Gaussian envelope for the  
> amplitude, and
> (2) an exponential time flow (which is the physical time of  
> performance as a function of symbolic score time). All of the  
> (infinitely many) voices silently start simultaenously at minus  
> infinity  ;-)
> One of the students, Christobal Massis Valencia (percussionist),  
> realized a ritardando (in combination with an "infinite" descend) as  
> a homework on that class:
> http://user.cs.tu-berlin.de/~noll/sqrt2
> Thomas Noll
>
>
> *********************************************************
> Thomas Noll
> http://flp.cs.tu-berlin.de/~noll
> noll at cs.tu-berlin.de
> Escola Superior de Musica de Catalunya, Barcelona
> Departament de Teoria i Composició
>
> *********************************************************
>
>
>
>
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> *************************************************
> Justin London, Professor of Music (and other stuff)
> President, Society for Music Theory
> Carleton College
> Department of Music
> One North College St.
> Northfield, MN 55057 USA
> 507-222-4397
> fax 507-222-5561
> jlondon at carleton.edu
>
>
>
>

PS: My other mail tnoll at iua.upf.edu doesn't exist any longer.

*********************************************************
Thomas Noll
http://flp.cs.tu-berlin.de/~noll
noll at cs.tu-berlin.de
Escola Superior de Musica de Catalunya, Barcelona
Departament de Teoria i Composició

*********************************************************




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