Datasheet

HH
VS1053B OGG VORBIS ENCODER VSMPG
3.3 Post-Processing with VorbisGain
Although the original CD standard defines a reference loudness that should be used
for CD recording, current CDs no longer follow that standard. Because of this unequal
loudness of CDs, songs compressed from CDs may have wildly differing subjective loud-
ness, a phenomenon that is known to most users of portable digital audio players.
VorbisGain is a program that uses a psycho-acoustical model to determine an actual,
perceived loudness of an audio track or album, and tags this information to the headers
of an Ogg Vorbis file. This makes it possible for a VorbisGain aware decoder to adjust
its output volume accordingly, and thus equalize loudness differences of songs without
a need to recompress them.
Using VorbisGain on all Vorbis songs will enhance the user’s listening experience be-
cause there is no need to turn volume up and down between songs. Many Ogg Vorbis
playback programs and plug-ins for PC’s as well as all VLSI Solution’s Ogg Vorbis de-
coder chips are compatible with VorbisGain.
Rev. 1.70c 2012-11-16
Page 30(39)