Sonnox Fraunhofer Pro-Codec - Manual (Page 35)

5.9 HD-AAC 5 THE PRO-CODEC PLUG-IN
First, in order to see the effect on the noise floor we input 1kHz and 2kHz tones at -60dB.
As this is a low-level signal at -60 dB, there is no activity on the top ten segments of the
bit meter.
Note the magnified scale down to -180 dB. ( ALT +
drag down on the dB scale.)
HD-AAC 24 bit with correct dither and truncation prior to the Plug-In.
HD-AAC 16 bit with correct dither and truncation prior to the Plug-In.
Since the input signal in both cases has been correctly prepared prior to the input of the
Pro-Codec Plug-In, no bit activity is shown below the selected bit depth. In these cases,
the lossless layer of the encoded HD-AAC file is 100% identical to the input signal.
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