On 2011-11-23, Fons Adriaensen wrote:
I don't think you need to reformulate the theory. Air absorbtion can
be taken into account numerically just in the same way as the
frequency response of the reflecting surfaces.
Seconded. The absorption term also seems to be pretty simple in the
analog/c
On Wed, Nov 23, 2011 at 04:16:36PM +, Dave Malham wrote:
> There's actually an online calculator here
> http://www.csgnetwork.com/atmossndabsorbcalc.html and a good paper by
> Dennis A. Bohn at www.rane.com/pdf/eespeed.pdf (from JAES 1988). Somehow,
> the fact that absorption peaks at low h
Hello all,
actually, it is the thermal relaxation and rotational losses of
molecules that augment/reduce sound abortion (among other processes).
And this process is not linear with
frequency/temperature/distance/humidity. You may consult
http://www.kayelaby.npl.co.uk/general_physics/2_4/2_4_1.html
There's actually an online calculator here http://www.csgnetwork.com/atmossndabsorbcalc.html and a
good paper by Dennis A. Bohn at www.rane.com/pdf/eespeed.pdf (from JAES 1988). Somehow, the fact
that absorption peaks at low humidities always seems somehow counter-intuitive - we (or, at least,
I
I agree. Air absorption is substantive in concert halls
because the rooms are so large, so that the sound travels
a long way before finally dying out. This is a major effect.
Even a "bright" concert hall(comparatively bright) has
a considerable roll off of the top octave in its reverberant
field
Dear Fons,
Thanks a lot.
I will check and consider the equation that you listed soon.
Thanks again.
Cheers,
Junfeng
On Wed, Nov 23, 2011 at 9:39 PM, Fons Adriaensen wrote:
> On Wed, Nov 23, 2011 at 06:54:35PM +0800, Junfeng Li wrote:
>
> > Likely, my question is whether the similar equatio
On Wed, Nov 23, 2011 at 06:54:35PM +0800, Junfeng Li wrote:
> Likely, my question is whether the similar equations as Eq. (3) exist when
> considering air absorption by extending Eq.(1) or Eq. (2). If it exists,
> what this extended equation should be?
If
A(w) = absorbtion in dB/m
d = distance
On 11/23/2011 10:16 AM, Fons Adriaensen wrote:
The code reproduced below is a cleaned up version of an algorithm
I found somewhere (and don't remember where).
could have been http://sengpielaudio.com/calculator-air.htm
float airabs (float p, float t, float r, float f)
{
float C, h, tr,
Hi, Ciao,
Thank you so much for your quite valuable comments.
The idea of the below code that you shared is from the
Benjamin Bernfeld, "Absorption of sound by air : A personal calculator
program," J. AES, Vol. 28, No. 7/8, pp. 521-524, 1980.
I believe this implementation introduces the air abso
On Wed, Nov 23, 2011 at 09:52:22AM +0800, Junfeng Li wrote:
> Now I am considering to improve the traditional image-source method to
> generate more natural room impulse response with the consideration of air
> absorption. I noticed that some open source codes (e.g., roomsim) have
> already realiz
Dear List,
Now I am considering to improve the traditional image-source method to
generate more natural room impulse response with the consideration of air
absorption. I noticed that some open source codes (e.g., roomsim) have
already realized this idea. To reformulate the image-source method from
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