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On 2013-03-03 23:42, João Pais wrote:

Hello,

I wanted to learn how to use ambisonics to use them in my patches. So far my attempts have failed, as I didn't find any documentation that gave me a good overview on the subjetc. Mainly, what I needed was a patch that allowed me to send in cartesian (x,y) coordinates of a room, and spacialize the sound in an ambisonic format. Does anyone have such a model that I could follow?

ambisonics works in spheric coordinates distance, azimuth and elevation (that's *not* polar, which uses distance, azimuth, height) spheric coordinates are given relative to the listener's position (whereas cartesian coordinates are often given relative to some abstract point of origin - which may coincide with the listener's position or not).

so what you basically have to do is:

• • transform the (global) cartesian coordinate system to a

listener-local cartesian system, by subtracting the listener's position from the sound-source position

• • transform the cartesian system to a spherical system. e.g. using

zexy's [cart2sph]

• • feed the spherical coordinates into an ambisonics encoder (usually

only the azimuth/elevation part, as distance is something not covered by standard ambisonics)

fmasdr IOhannes