ISO 532 B / DIN 45631 Loudness (Aaron Hastings )


Subject: ISO 532 B / DIN 45631 Loudness
From:    Aaron Hastings  <hastinga(at)ECN.PURDUE.EDU>
Date:    Tue, 5 Dec 2000 11:54:38 -0500

This is a multi-part message in MIME format. ------=_NextPart_000_03F5_01C05EB2.24C12040 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit To the Group: I am including (what I think is) a working matlab program for the calculation of loudness according to DIN45631 / ISO 532 B. It reads a sound from a wav file, calibrates the data, filters it into 1/3 OBs, and then calculates Loudness and Specific Loudness. To anyone interested: A while back I asked for some help on putting together a loudness program in matlab. Several people were very helpful and I want to offer my thanks to everyone for their input. Here is what I have. It seems to work, but I would be interested in anyone's feedback. Some notes: The Oct3dsgn function is not mine. I got it from the matlab site. My Loudness code is a conversion of the BASIC code found in J. Acoust. Soc Jpn (E) 12, 1 (1991). I had tried an older program found in JASA, but I think its tables were a little old so I couldn't get the right value for standard signals. Finally, I had to mess with the 1/3 OB filters to get the poles to be stable so you might want to check to make sure what I did there is reasonable. Thanks for any comments Aaron ------=_NextPart_000_03F5_01C05EB2.24C12040 Content-Type: application/x-zip-compressed; name="DIN 45631 Complete App Version 1.1.zip" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="DIN 45631 Complete App Version 1.1.zip" UEsDBBQAAAAIAJBchSk4ehOr7QEAAFEDAABAAAAATXkgRG9jdW1lbnRzL1Jlc2VhcmNoL0N1cnJl bnQvUHJvZ3JhbXMvTWF0bGFiL0ZJTklTSEVEL1Bvd1NwZWMubXVSTY/aQAw9B4n/4MuqbIW6LEdW HKiALloKiMBWVdVKQ+JJRpvM0PkI8O/XHsJlq0r58NjP9nv23MHGnNIjZl/qbueOnuQ7+tLkpjLF ZdS60ov24syn5NfP87kvf4/brN6lL10/l/ct8lVYJQ4VugherDb7HRuXJEnGyU7VCE4VWlTslC56 U1EfK6ULkBb/BtTZhYO5jMHpLF1sZ1PIZdvgx3r7slh9Y3M1n+8Yswp1fUALRsLRKO0dSGNBQKEa 1CClj+D162y7nGyu+Ba+ucK9AdOgrcSxbbLe71ripJZbkFrKYMHehhomzNiHHKOMSHR+Iw8NgUzL hrNcm9XtMHoSaLp2lEyENRqehfMk3fXhGa1V2RssxYFOm2DzgLDXJME65eNIpsIjpF5Yj/koeXyE lWlgMODQkurAFhvllNEfYpThgxuRB160OWn4GgrHZGTQmSc8/G+nT5EyzVxoz0OqxRvtL1gEXwoP J4RSNAhkVsgEcgkWnakCV+12eD/jDFXVk+6ByyWxWooeOMQVrxOiUQ1BFEJpoCmQ/yRs7qBURUnR 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http://www.auditory.org/postings/2000/
maintained by:
DAn Ellis <dpwe@ee.columbia.edu>
Electrical Engineering Dept., Columbia University