Re: New wavefield synthesis system -- holosonics?


Subject: Re: New wavefield synthesis system -- holosonics?
From: Kevin Austin (kevin.austin@videotron.ca)
Date: Sun Jul 25 2004 - 17:59:21 EDT


My uninformed guess is that it works on a principle something similar
to holography (holosonics). It is likely 'size dependent', with
different 'mixes' needed for different size spaces. As holography
does not 'replicate' the object, but rather the wave patterns that
would be created if the object were to be there, the creation of
instantaneous sound pressure patterns (rather than the waves
themselves) could be the objective.

The example cited of a stone dropping into a pond may be a useful
place to start. Drop the stone into a still pond, and take a picture
of it. What exists is as wave pattern -- no velocity, simply
displacement.

As this surface is representative of the energy passing across it,
this 'displacement' of a two-dimensional surface could be emulated by
a surface that has small piston rods underneath it, and the rods
would move up and down, creating the effect of the wave moving across
the water (transverse wave motion if I recall). An animated
explanation is at
http://www.kettering.edu/~drussell/Demos/waves/wavemotion.html ...
and this is taken from the excellent site:
http://www.kettering.edu/~drussell/demos.html

In air, the soundwave moves by longitudinal vibration. If the system
(by using 400 small drivers) is able to emulate the kind of
displacement which causes the brain to interpret the information
correctly (as in a hologram), 'how' it is done is less important (to
the listener). A form of 'holosonics'.

Best

Kevin

>Judging from what was said, each sound must play on a separate
>channel which can be localized independently. I wonder how many
>channels it supports ... if you could have a sound object created in
>a physical space and walk around it, and emulate distant sounds from
>outside the room. Or create heirarchal structures, for example, not
>just the position of the horse, but the position of each of the
>horse's hooves, the horse's breath, etc, and then do that with maybe
>say, a hundred horses moving across a battlefield..
>
>--st
>
>----- Original Message -----
>From: "Kevin Austin" <kevin.austin@videotron.ca>
>To: <eamt@concordia.ca>
>Sent: Sunday, July 25, 2004 2:29 PM
>Subject: Fwd: New wavefield synthesis system
>
>
>> Date: Sun, 25 Jul 2004 14:46:30 +0100
>> From: Scott Wilson <sdwilson@wesleyan.edu>
>> Subject: New wavefield synthesis system
>>
>>
>> For the curious...
>>
>> http://www.iosono-sound.com/eng/index.html
>>
>http://news.com.com/MP3+creator+returns+with+3D+sound/2100-1026_3-5280535.ht
>ml
>>
>> Scott
>>
>>
>> __________________________
>>
>> Scott Wilson
>> Lecturer in Music
>> Deputy Director of Postgraduate Studies
> > Music Department
> > University of Birmingham
> >
> > +44 (0)121 414 5767
> >



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