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# Posts by jamin

Nah, don't sweat it, just math. Stare at enough equations and you will find new to you stuff.Folks trying to figure stuff* out sometimes end up with a pile of junk* in their equations that looks kinda messy. Maybe they notice a similar pile of junk* tends to pop up often but realize it seems quite useful. Sometimes they will go off and investigate the nature of the stuff* and shure enough it is a quite handy pile/relationship. Bingo, they give it name and a symbol and they...
Try this link -- p 117 & p 125http://www.artalabs.hr/download/ARTA-user-manual.pdfThat will get you a feel for some of the measures used. Then Google direct to reverberant ratio and have fun. Somewhere in the google you will find the equations typically use as it is part of some measure software systems, notably EASE. What you may find is the start and stop times for the integrals seem to be geared for larger spaces. I can't remember if EASE will let you change those...
Hah, thanks and I do know but I was just kinda "urging" Arny to rethink and mod the "typo" for, um, posterity because I'm pretty sure he knows also.I danced around the coherent summing a few posts back simply because I was lazy and didn't want to go there right then. Just trying to get the notion across that more energy in the room is, uh, louder., hah.Good you showed 'em essentially the graph of the equation I posted earlier. You know I always seem to not remember...
Very succinct Arny.Question for you though, about the fully coherent in phase addition, shouldn't those dB numbers be 6 and not 3 ?
Ratman--For some of the math see the link--
The sound of one person clapping - the sound of more than one person clapping - its measurable.
Actually, this is a quite specific situation which is a little different than energy at lots of frequencies simultaneously ( more broadband). As a result of it being a pure tone and depending on wavelength, you may well be able to move your head a bit and hear the tone get louder and softer as you move. This is a result of moving into and out of regions of constructive and destructive interference. With higher frequencies ( shorter wavelength ) and a lively space ( lots...
Mark, Good to know about making some sense there -- some days I shouldn't try to explain stuff, hah. As an aside, I happen to reference the pulsing sphere ( cause I had the link on the phone ) and Andy posted the moving piston. The sphere is omni but the piston in baffle isn't always so the Bessel function pops up.
Not trying to go out of context with the snip, just saving space.Mark, I know we are talking about AC signals and Oh My I don;t want a flaw, especially not a "Fatal Flaw" - yipes.The link in my first post for the threadHad the "Theory Behind the Nomographs" side bar which Is also avaiable from http://linkwitzlab.com/images/graphics/theory.gifReproducing a bit of Beranek's 1954 Acoustics text giving a clue in the first sentence with the word pulsating, a further clue in the...
I didn't know what I didn't know until I knew what I didn't know, you know? And I haven't learned it all yet. But I do know that I know very little, in fact, less every day. But I take heart since nobody* knows everything. *teenagers are an excepted class
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