Re: dynamic compression of comertials

["Crockett, Brett" <BGC@xxxxxxxxx>]

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@xxxxxxxxxxxxxxx] On Behalf Of MARUI Atsushi
Sent: Tuesday, September 20, 2011 7:08 AM
To: AUDITORY@xxxxxxxxxxxxxxx
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