(Hi Matt, we've met before at NI btw, briefly)
Thanks, I look these up, I think I browsed through some of this a few
years ago, Rocchesso I think.
I already had a hammer model for the same thing, which is piano synthesis
and a soundboard model.
For the moment I am more interested in spectral flatness.
I would like to synthesize decaying white noise thats completely flat
Basically the ideal reverb response in a way.
I want to figure out what details make a piano sound sound like piano,
and how to exaggerate or idealize these
thats one reason why I replaced hammer model and soundboard model with
white noise for now.
(It turns out that the fluctuations in the spectrum matter, but can also
give an interesting touch
when the noise varies with time...)
Now I want to replace it with something really flat to figure out what
role some of the modes of different real soundboards have, if any, or if
the impact sound is more important (if it is)
and what makes that impact, perceptionally, in the case of the piano
(where immediate collision sounds don't matter).
I also experimented with random phase noise of the soundbard spectrum vs
the recorded impact
It makes a difference but I am not sure what it is at the moment,
perceptionally and phase wise.
A minmum phase version of the same impact seems to sound worse to me for
instance.
The reverberation seems quite important.
An other thing thats of importance seem to be the reflections between
hammer
and where the string is fixed, but you dont need an impact model for this,
they can be modeled with a truncated comb filter response... thats
already seperated out.
So my question for now is: how can we synthesize completely flat
decaying noise?
(is it even possible?)
Am 27.07.2016 um 21:33 schrieb Matt Jackson:
There might also be something by max Matthews or Curtis Roads.
I think I recall a chapter in the computer music tutorial.
Sent from a phone.
On 27.07.2016, at 20:47, Andy Farnell <padawa...@obiwannabe.co.uk> wrote:
For impact/contact exciters you will find plenty
of empirical studies and theoretical models in the
literature by;
Davide Rocchesso
Bruno Giodano
Perry Cook
These are good initial paper authors to search
all best
Andy Farnell
On Wed, Jul 27, 2016 at 07:00:02PM +0200, gm wrote:
Hi
I want to create a signal thats similar to a reverberant knocking or
impact sound,
basically decaying white noise, but with a more compact onset
similar to a minimum phase signal
and spectrally completely flat.
I am aware thats a contradiction.
Both, minimum phase impulse and fading random phase white noise are
unsatisfactory.
The minimum phase impulse does not sound reverberant.
The random phase noise isn't strictly flat anymore when you window
it with an exponentially decaying envelope
and also lacks a knocking impression.
I am also aware that a knocking impression comes from formants and
pronounced modes
related to shapes and material and not flat, which is another
contradiction..
I am not sure what the signal or phase alignment is I am looking for.
Also it's not a chirp cause a chirp sounds like a chirp.
What happens in a knock/impact besides pronounced modes or formants?
Somehow the phases are aligned it seems, similar to minimum phase
but then its
also random and reverberant.
Any ideas?
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