Re: [linux-audio-user] Audio 3-D Demo --- Any Interest in Software?

--- Steve Harris <S.W.Harris(a)ecs.soton.ac.uk> wrote: I don't understand how impulse response (IR) works. I know you fire off a sound/impulse and then the response is used to tell calculate the properties of your room. Will IR tell me that the average/desirable Sabin value from 20Hz to 4KHz for a .3 reverberation time in a 17X14X7 room is 148.6? A fundamental problem I see with IR is that the accoustical values of good rooms are being applied to signals that are created in very poor accoustical environments where frequency responses in the audible range are not flat. In this scenario, only half the problem is being addressed. This might not be a problem with IR as much as it is a mis-use or underutilization issue. Almost everyone on this list has a recording studio in an untuned room. When you record a signal in a room, using close mic techniques or not, you're recording the sound of the room and the source. The chances are very good that the untuned room sounds like crap and you probably don't know it. You are recording those bad frequency responses. So, what good does it do to put that poorly recorded source into a great room? My point is that great room modeling, reverberation and echo tools are "the cart before the horse." I'd suggest that the first thing to deal with is correcting these bad rooms with Virtual Rooms. You know, crap in equals crap out. It doesn't matter whether we use IR or a $9.00 tape ruler and the known Sabin values and surface area for the materials of each users untuned recording studio to determine what needs to be corrected before the signal is recorded. I don't have a clue what Audio 3-D is. It sounds like part of its usefulness could be room modeling. If that's true then create a LADSPA plugin that can sit in every input channel of every bedroom studio in the world and adjust the frequency and reverberation responses to KNOWN and useful values. If you do this, many many people can forget about learning to cut 400Hz and 1 and 2kHz because those problems won't be recorded. I know Virtual Rooms aren't particularly sexy and don't expect them to win a race against the natural impulse to examine the bra section of the Sears catalog but what the heck. The question I can't answer is, can Virtual Rooms sounds as good as physical rooms that are tuned? Ron "section undergarments, page 42" Parker __________________________________ Do you Yahoo!? Find out what made the Top Yahoo! Searches of 2003 http://search.yahoo.com/top2003