Sonnox Fraunhofer Pro-Codec - Manual (Page 10)

4.3 HD-AAC 4 SUMMARY OF CODEC FEATURES AND APPLICATIONS
4.3 HD-AAC (Fraunhofer)
The HD-AAC codec from Fraunhofer has a very clever feature; the single compressed
lossless file includes a lossy core channel. It therefore acts as a lossless archival format, a
lossless distribution format for the masters, and a final playback format for both lossless
and lossy decoders – and all of this in a single file.
In the case of HD-AAC playback, if the decoder in your player has full HD-AAC capability,
you will be able to listen to a perfect replication of the original WAV file. However, the
same HD-AAC file will still play through a decoder that does not have HD-AAC capability,
and instead you will be listening to the embedded lossy AAC channel.
The HD-AAC codec now supports 16-bit files in addition to 24-bit data.
4.4 AAC-LC (Fraunhofer)
The AAC-LC codec now supports a 96 kHz session sample rate and a VBR mode at 256
kbps.
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