Subject: Re: Image-source model with consideration of air absorption From: Junfeng Li <junfeng@xxxxxxxx> Date: Tue, 22 Nov 2011 18:57:57 +0800 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>Dear Emmanuel, Thanks a lot for your information. I found that Roomsim (http://media.uws.ac.uk/~campbell/Roomsim/) implemented this function. your Roomsimove cannot be found from the URL that you provided below. Could you check it again? My another concern is what the Green function （ exp(jwd/(4*pi*d) ） in the free field should be when it is extended when considering the air absorption effect? Do you have any idea? or references on this issue? （Though I believe it is a very easy question, I cannot find the answer, ....) Thanks a lot again. Cheers, Junfeng On 11/11/22, Emmanuel Vincent <emmanuel.vincent@xxxxxxxx> wrote: > Dear Junfeng, > > Roomsim (http://media.uws.ac.uk/~campbell/Roomsim/) as well as our command-line software Roomsimove (for moving sources)(http://www.irisa.fr/metiss/members/evincent/Roomsimove.zip) account for this. > > Emmanuel > > -- > Emmanuel Vincent > METISS Project-Team > INRIA Rennes - Bretagne Atlantique > Campus de Beaulieu, 35042 Rennes cedex, France > Phone: +332 9984 2269 - Fax: +332 9984 7171 > Web: http://www.irisa.fr/metiss/members/evincent/ > > > On 11/22/2011 11:28 AM, Junfeng Li wrote: > >Dear list, > > > >I am now considering to generate room impulse response (RIR) using the well-known image-source method. However, I found that the traditional image-source method only considered the absorption of enclosure surfaces, without the consideration of air absorption. However, the air absorption should be also an important factor which affect the simulated RIR. > > > >To reformulate the image-source method, the Green function （ exp(jwd/(4*pi*d) ） in the free field should be extended to that with the consideration of air absorption effect. I searched this problem for some days. However, I did not find any reference. > > > >Could anyone point some references on this issue or the (source code of) improved image-source method that implemented this idea? > > > >Thank you so much in advance. > > > >Best regards, > >Junfeng