Re: Image-source model with consideration of air absorption (Emmanuel Vincent )


Subject: Re: Image-source model with consideration of air absorption
From:    Emmanuel Vincent  <emmanuel.vincent@xxxxxxxx>
Date:    Tue, 22 Nov 2011 12:01:51 +0100
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

The URL http://www.irisa.fr/metiss/members/evincent/Roomsimove.zip is correct. I don't know about the Green function but you can read it from the code. Emmanuel On 11/22/2011 11:57 AM, Junfeng Li wrote: > 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 > -- 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/


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