3-84
OPERATION ORBAN MODEL 8685
The CBS algorithm does not need silence gating because it is a “short-term” loud-
ness measurement that incorporates models of the loudness integration time of
human hearing, which the BS.1770 algorithm does not.
Moreover, controlling loudness to a standard such as BS.1770 says nothing about the
subjective acceptability of the loudness controller’s action. Automatic loudness con-
trollers can produce all of the well known artifacts of dynamics processing, including
noise breathing, spectral inconsistency, gain pumping, and harshness. Improperly de-
signed multiband compressors can reduce dialog intelligibility
12
. This is why it is im-
portant to carefully assess the audio quality and side effects that an automatic loud-
ness controller produces so that one can choose a device that controls loudness ef-
fectively without producing objectionable and unnatural artifacts that can fatigue
audiences. All loudness controllers are not created equal even if they produce iden-
tical measurements on a loudness meter.
—Robert Orban, February 2010
12
Stone, Michael A.; Moore, Brian C. J.; Füllgrabe, Christian; Hinton, Andrew C.,
”Multichannel Fast-Acting Dynamic Range Compression Hinders Performance by
Young, Normal-Hearing Listeners in a Two-Talker Separation Task,” J., AES Volume
57 Issue 7/8 pp. 532-546; July 2009
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