The way Diedre did it, it was less obtrusive, and hard for 
the ear to find it. It was quite the demo presentation from
her paper. The system had those high grade Genelec speakers.
Any deficiencies would have stood out like a sore thumb.

She made good use of the scaling aspects of wavelet transforms,
to deal with different times and frequencies to good effect.
Like anything thing else, there's always more tweaks and 
adjustments to do.

Later,
-Partev


==================================================================


--- michael.gogins@gmail.com wrote:

From: Michael Gogins 
To: csound@lists.bath.ac.uk
Subject: [Csnd] Re: Re: looping pvsfread sounds different each time
Date: Wed, 3 Jun 2009 11:41:55 -0400

I would expect tiling to happen with wavelets also, but the tiling
would happen at different times for different frequencies, which would
make it much less obtrusive.

Regards,
Mike

On 6/3/09, Partev Barr Sarkissian  wrote:
> There is a paper on dealing with problems of looping
> and the problem of what's called 'tiling', that was
> presented at a conference in London two years ago.
> Wavelets were used to keep abrupt changes from
> occuring at the sample loop points. Not sure if that
> could be applied here or not. Might even help with
> the 'smearing' related to 'pvoc'. The paper was done
> by Diedre O'Regan of Trinity College, Dublin and
> presented at the AES Conference on Hi Resolution Aduio
> in June 2007. The demo sounded real interesting.
> Maybe helpful?
>
> I love it when you get down to the nitty-gritty of
> it all. Keep up the good work.
>
>
> -Partev
>
>
> ======================================================================
>
>
> --- richarddobson@blueyonder.co.uk wrote:
>
> From: Richard Dobson 
> To: csound@lists.bath.ac.uk
> Subject: [Csnd] Re: Re: Re: Re: Re: Re: Re: Re: looping pvsfread sounds
> different each time
> Date: Mon, 01 Jun 2009 21:11:36 +0100
>
> Partev Barr Sarkissian wrote:
>> Looping something with phase in it? Be aware of a thing
>> called tiling. It's the audio version of a tile pattern
>> on a floor, that repeats. Always got to find that point
>> where you can loop at that'll be glitch free.
>>
>>
>
> Unfortunately it is a bit more complicated. To begin with, in the
> frequency domain you do not have one phase, but N phases, each of which
> is incrementing (in some sense) arbitrarily, modulo 2PI, frame by frame.
> They may all start out at the same position (e.g. zero), like so many
> independent clocks started together, but will not end up at the same
> relative position. So what do you do when you want to go back seamlessly
> to the starting point?  The problem is also closely related to the
> general smearing problem of pvoc, where you want some subset(s) of those
> phases to stay in lockstep during transformations, but, needless to say,
> they don't. In this instance, rewinding to the start of the sound counts
> as a transformation.
>
> Richard Dobson
>
>
>
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-- 
Michael Gogins
Irreducible Productions
http://www.michael-gogins.com
Michael dot Gogins at gmail dot com


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