Nokia N73 - Variable Bitrate

Nokia N73 Music Edition
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Copyright © 2006 Nokia. All rights reserved.
Variable bitrate
Your device also supports variable bitrate (VBR). Variable
bitrate means that the bit rate of the encoding varies with
the complexity of the encoded material. When using VBR,
the encoding is optimized to preserve a constant audio
quality throughout the track, rather than losing quality for
complex music sections as with constant bitrate (CBR)
encoding.