Sonnox Fraunhofer Pro-Codec - Manual (Page 41)

5.9 HD-AAC 5 THE PRO-CODEC PLUG-IN
5.9.5 Overloading
HD-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 Reasons
to
Audition
HD-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.
Overloading
the
Input
(See sections 5.3.3 and 5.9.5 ) The input meters will indicate an overloading input,
but the Bitstream
Level 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.
Lossy
Core
If it is intended to make use of the lossy core, it is wise to audition the lossy channel
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