Overloading hd-aac, Reasons to audition hd-aac, 5 overloading hd-aac – Sonnox Fraunhofer Pro-Codec User Manual
Page 41: 6 reasons to audition hd-aac
5.9 HD-AAC
5 THE PRO-CODEC PLUG-IN
5.9.5 OverloadingHD-AAC
The screenshot below illustrates the behaviour of HD-AAC under overloading conditions.
A typical audio signal is shown with the display zoomed. The input level is such that the
input meters show clipping. Since HD-AAC does not have internal headroom, the signal
will clip.
HD-AAC 16 bit with 16 bit input signal overload at the Plug-In input.
HD-AAC 16 bit internal dither is
DISABLED.
Note the very high
DIFF signal; the overload condition is clearly audible in the DIFF signal.
5.9.6 ReasonstoAuditionHD-AAC
Finally, a few observations on the reasons why you should audition a lossless codec,
because a hasty person might initially think that it can serve no purpose. If you have
carefully read this manual this far, you will have realised there are several good reasons to
audition lossless codecs.
OverloadingtheInput
(See sections
and
) The input meters will indicate an overloading input,
but the
BitstreamLevel meters will not show clipping for HD-AAC because they
have no internal headroom. During audition, the
DIFF signal clearly shows the effect
of overloading the input to the lossless codecs, and the effect will be very audible.
LossyCore
If it is intended to make use of the lossy core, it is wise to audition the lossy channel