jmod.sur.vimic~¶

Summary¶

• Description: Virtual Microphone Control in a Jamoma Module
• Developer: Nils Peters, Tristan Matthews, Jonas Braasch, Stephen McAdams
• Version: 2.2.2009
• Platform: MaxMSP - Jamoma
• OS: MacOS
• License:
• Status of this entry: in progress

Parameter definition¶

Coordinate system convention¶

• Cartesian coordinates: Mathematical system (x-axis to the right, y-axis to the front, z-axis to the top)
  • Center of origin (0,0,0): in the middle of the virtual room
• Spherical coordinates: Navigational system

Parameter describing a sound source¶

parameter	description	data format	range	initial state	unit	example	misc
/source.#/position	position of the #th source in cartesian coordinates	float float float		0. 0. 0.	meter	/source.1/position -1. 1. 0.
/source.#/position/aed	position of the #th source in spherical coordinates	float float float			degree degree meter	/source.1/position/aed 45. 0. 5.
/source.#/orientation/yaw	yaw angle of the #th source	int	-180...180	0.	degree	/source.3/orientation/yaw 45	range is wraped
/source.#/orientation/active	activates 3th source orientation	boolean	1 0	0	NA	/source.3/orientation/active 1
/source.#/gain	gain of the #th source	float	0..127	0.	Jamoma-MIDI	/source.4/gain 100
/source.#/active	activates 3th source rendering	boolean	1 0	0	NA	/source.2/active 1

Parameter describing a virtual space¶

• in the following the placeholder ## stands for the different walls "left", "right", "front", "rear", "floor", "ceiling".

parameter	description	data format	range	initial state	unit	example	misc
/room/size/xyz	Size of the virtual room in width, length and height	float float float	0. 40.	20. 30. 8.	meter	/room/size/xyz 14. 23. 4.
/room/temperature	temperature to calculate speed-of-sound	float	-20. ... 30.	21	degree Celsius	/room/temperature 25.
/room/reflection/order	maximum order of rendered early reflections	int	0 1 2	0	NA	/room/reflection/order 1	0 means only direct sound components
/room/reflection/gain.#	gain of the #th reflection order	float	0 ... 127	0.	Jamoma-MIDI	/room/reflection/gain.0 100	only valid if /room/reflection/order is set accordingly
/room/reflection/airfilter	damping frequency of the early reflections due to air absorption	int	500 .. 19000	6000	Hz	/room/reflection/airfilter 4000	filter will be applied to early reflections
/room/absorption.##/low	absorption for the low frequencies of the ## wall	float	0.1 .. 99.9	99.9	% absorption
/room/absorption.##/mid	absorption for the mid frequencies of the ## wall	float	0.1 .. 99.9	99.9	% absorption
/room/absorption.##/high	absorption for the high frequencies of the ## wall	float	0.1 .. 99.9	99.9	% absorption
/room/absorption.##/low_mid_frequency	low-mid crossover frequency for the ## wall filter	int	10 9999	250	Hz
/room/absorption.##/mid_high_frequency	mid-high crossover frequency for the ## wall filter	int	10 9999	5000	Hz
/room/absorption.##/preset	absorption presets for the ## wall	symbol				/room/absorption.left/preset brick
/room/distance/mode	distance attenuation function	symbol	"inverse", "exponential"	inverse	NA	/room/distance/mode inverse	inverse square law or exponential decay
/room/distance/dbunit	db-Unit for exponential attenuation function due to distance	float	0. .. 60.0	3.	dB	/room/distance/dbunit 1.5	applicable according to settings of of distance mode
/room/distance/power	exponent x of the distance function 1/d^x	float	0.0 .. 9.0	1.	NA	/room/distance/power 0.75	applicable according to settings of distance mode

Parameter describing the position of loudspeakers¶

• in ViMiC, instead of loudspeakers the position of virtual microphones is defined

parameter	description	data format	range	initial state	unit	example	misc
microphones/amount
/microphones.#/position		float float float			meter
/microphones.#/position/aed		flaot float float			degree degree meter
/microphones.#/orientation/pitch		float	-180. .. 180		degree		range is wraped
/microphones.#/orientation/yaw		float	-180. .. 180		degree		range is wraped
/microphones.#/orientation		float float	-180. .. 180		degree		range is wraped
/microphones.#/directivity/preset		symbol	'omni' ... "figure-8"		NA
microphones/directivity/power		int	0 .. 9		NA
microphones/polarity		boolean	1 0		NA
/microphones.#/directivity/ratio		float	0 ... 1.		NA
/microphones.#/gain		float	0 .. 127.		Jamoma-MIDI
/microphones.#/active		boolean	1 0		NA
/microphones.#/solo		boolean	1 0		NA

Other parameter¶

parameter	description	data format	range	initial state	unit	example	misc
miscParameter1
miscParameter2

Projects, sound, and music¶

• Sean Ferguson “Ex Asperis”, Chamber orchestra & live electronics, Canada, 2008
• Sound Installation at the Eurêka! Science Festival, Canada, 2008
• IMAX movie: “Molecules to the Max”, US, premiere early 2009

References¶

• Peters, N., Matthews, T., Braasch, J., and McAdams, S. (2008). Spatial Sound Rendering in Max/MSP with ViMiC. In Proc. of the International Computer Music Conference ICMC08, Belfast, UK. [pdf]
• Manual [pdf]
  h1. External Links

• http://www.music.mcgill.ca/musictech/
• http://www.cirmmt.mcgill.ca/

Media¶