Subject: Re: dynamic compression of comertials From: "Crockett, Brett" <BGC@xxxxxxxx> Date: Tue, 20 Sep 2011 10:37:24 -0700 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>Dolby has created a very sophisticated loudness control algorithm that has been integrated into TVs, Home Theaters and now PC laptops. It uses a combination of perceptual loudness and auditory scene analysis that are quite interesting. http://www.dolby.com/consumer/understand/volume-control/dolby-volume.htm l -----Original Message----- From: AUDITORY - Research in Auditory Perception [mailto:AUDITORY@xxxxxxxx On Behalf Of MARUI Atsushi Sent: Tuesday, September 20, 2011 7:08 AM To: AUDITORY@xxxxxxxx Subject: Re: dynamic compression of comertials Hi Zlatan, In the United States, there is an act called CALM that limits perceived loudness of TV Ads, which will be enforced by the end of this year. Loudness measurement will be done according to ITU-R 1770 standard. http://en.wikipedia.org/wiki/Commercial_Advertisement_Loudness_Mitigatio n_Act I'm not sure if other countries have similar laws, but in Europe, EBU has a similar standard: http://tech.ebu.ch/loudness Cheers, Atsushi -- MARUI Atsushi Faculty of Music, Tokyo University of the Arts http://www.geidai.ac.jp/~marui GnuPG Public ID: 5AFA73F1 On 2011/09/20, at 20:04, Zlatan Ribic wrote: > Dear List, > > compressed comertials in broadcasting are much louder if compared with "standard" program. Is there any norm limiting this misuse? > > Thanks, > > Zlatan