Draft for Audio Support

[moritzstaffel]

No description provided.

[moritzstaffel]

I have added the information so fro that we researched. What is missing is how we handle attachments, hanging material and other stuff.
Also we need to get more input on the things that we researched.

[petrvanekrobe]

additional items needed for audio support:

need to support a range of angles for the sound angle.  for their speakers they have a set of angles within the range that they support.  for others they can support any angle in that range

for sound angle, need to support asymetric dispersion with a different angle possible in each direction

also need to support rotation of the sound angle

max SPL is not always in dB.  There are different dB formats like a weighted dB.

for mvr, need different material types to support reflectiveness for the audio analysis

[petrvanekrobe]

The Frequency Min and Max should be at the -6dB mark (instead of the proposed 5dB)
I can confirm, that the MaxSPL taken from 1 meter from the speaker is common practice.

For Listening Planes, I would find it more useful to all polygon with any number of points that make up an infinitesimally thin layer. I believe this is how our software treats listening planes (with no range of height, just a single height measurement hovering over a surface).

[ILane-VW]

• we should treat the sound angle almost like a beam of light with a range of values in both the X and Y direction since the sound dispersion is not always symmetrical. using sound angle min X, min Y, max X, max Y. not all speaker manufacturers have this capability to change the angle dynamically on a speaker but we should support it
• they also need to be able to rotate the sound, but don't need support for a range of rotations, they just need to be able to set the rotation on the sound "beam" since each speaker is different. an asymmetric dispersion at a 45 deg angle for example
• we will get the list of SPL formats that we want to support for the gdtf, but we do not need to worry about converting the values from one format to another, this is not something that is done. speakers are specified with a certain format. so the user just needs the option to choose the format and enter the value, if they change the format later it should remove the value and force them to input a new one

[ILane-VW]

Received the following information from d&b about different formats to support for sound level:

Here is a table with different excitation signals and weightings.
Excitation Signals and weightings are independent from each other and can be used in any combination.

Excitation Signal	Frequency Weighting	Unit	Time Weighting	Unit
Pink noise	None	DBZ, dB or DBSPL	Fast	F
IEC60268 "Program Simulation Noise"	A-Weighting	dBA	Slow	S
EIA426B "Loudspeaker test signal"	C-Weighting	dBC	Leq	Leq, Laeq, LCeq
AES75 "M-Noise"			Peak