[PD] Re: [PD-announce] space~ - object for spatialization of audio sources

[oliver oli]

Hi Shahrokh,

nice external, seems to run stable, but my machine is a little bit slow
to handle more than 2 quad space~ objects. as i don't know much about
spetialization in general, what should i do with the reverb outlet?

the x=0,y=0 is in the center of the room? seems that the sound jumps
from inside to outside on -1 * length/2 (stereo setup). funny effect.

did you think about writing a ladspa or dssi plugin?

i like the idea that the speakers are windows to an outer room. i just
shortly tried it, but it seems the image is much more stable than with
panning if you walk through the room.

now i have to get a faster machine to do something serious with it :-)

oli

Shahrokh Yadegari wrote:
> Hi All,
> 
> I have just put up an alpha version of space~, which is a real-time 
> implementation of the cmusic's space unit generator with many 
> improvements. I have recently added a considerable amount of code for 
> room management. So use it carefully.
> 
> You can download compiled versions for Linux and Mac OS X (Darwin) at:
> http://www.crca.ucsd.edu/~yadegari/space.html
> 
> I have not compiled it for windows yet.
> 
> enjoy,
> Shahrokh.
> --------------
> 
> Notes for version 0.4alpha
> --------------------------
> Lots of code has been added to this version recently for room
> management and treatment of the reflections when the source is
> outside of the virtual space. Generally you should not allow the
> source to go outside of the virtual source.  While I have tried to
> accomodate for the source to be outside of the virtual space and
> thus have the sense of a source being far apart, you should not
> depend on this effect to stay the same. As usual reports of bugs
> and suggestions are welcome. Send me mail at (sdy at ucsd.edu).
> 
> 
> space~ - A module for spatialization of audio sources
> -----------------------------------------------------
> Based on an algorithm and a partial implementaion by F. Richard Moore
> in "cmusic" as part of the Computer Audio Research Laboratory (CARL) 
> package.
> 
> Real-time implementation, port to Pd, and new improvements by Shahrokh 
> Yadegari.
> 
> With the help of Ted Apel , Anthony Burr , Harry Castle, and Miller 
> Puckette.
> 
> Space~ is a real-time implementation of a general model for
> spatialization of audio sources. The central conceit of the algorithm
> is that of a room within a room.  The inner room is the space
> delimited by the speakers which contains the listeners. The model
> simulates the behavior of the sound source within a user-defined
> virtual outer room, as heard from the inner room. The speakers
> act as "windows" throug which sound from the outer room passes.
> 
> 
> NOTE: In this implementation both the inner and outer rooms are
> assumed to be squares. Also keep in mind that the simulation of a
> source in the listening room is not as good as when the source is
> in the virtual space and currently one hears sudden changes to the
> level of audio on opposite speakers when a sources passes through
> an inner wall.
> 
> 
> The syntax to space~ is a follows:
> ----------------------------------
> space~ [card] [stereo|quad] [inner-room-size outer-room-size]
> 
> - card - indicates that the cardiod pattern information is supplied
> for the audio source
> - stereo|quad - specifies the diffusion mode (quad is the default)
> - inner room size - is the size of the inner room in meters
> - outer room size - is the size of the outer room in meters
> 
> (When inner room size and outer room size are not specified, sizes
> 4 and 50 meters are assumed.)
> 
> All inlets and outlets of space~ are of type signal
> 
> Outputs for stereo
> ------------------
> 1 - Front Left
> 2 - Front Right
> 3 - to be connected to Reverb
> 
> Outputs for quad
> ----------------
> 1 - Front Left
> 2 - Front Right
> 3 - Rear Left
> 4 - Rear Right
> 5 - to be connected to Reverb
> 
> Inputs
> --------
> 1 - audio source
> 2 - X coordinate in meters
> 3 - Y coordinate in meters
> 4 - amplitude (not in db)
> 
> 
> Additional inputs when "card" is specified
> ------------------------------------------
> 5 - Theta (in radians) - source radiation direction
> 6 - Back - radiation level in the opposite direction (0 <= Back <= 1)
> 
> 
> Methods
> -------
> stop - stop spatial processing (for saving cpu cycles
> start - start processing
> theta - source radiation direction (when "card" is not specified)
> back - radiation level in the opposite direction of theta (when "card" 
> is not specified)
> direct - affecting the power laws for calculating the direct ray 
> attenuation
> reflect - affecting the power laws for calculating the reflected ray 
> attenuation
> TH (also "th" or "threshold") - threshold value for ray diffraction 
> simulation
> CF (also "cf" or "crsossfade") - crossfade form for ray diffraction 
> simulation
> 
> 
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