Manual
Table Of Contents
- Introduction
- Supported Codecs and Formats
- The Sonnox Fraunhofer Pro-Codec
- Additional Information on Workflows
- Lossless Codecs (mp3-HD and HD-AAC)
- Description of Controls
- Presets and Project/Session Data Handling
- Preset Manager Toolbar
- Pro-Codec Signal and Control Flow Diagram
- Specifications
- Copyright and Acknowledgements
- Manual Revision History
- Platform Specific Supplement
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While encoding/auditioning an mp3-HD signal, attention should be paid to the lossy core. We
recommend selecting the appropriate core codec in an adjacent codec window, which will
allow correct auditioning of the lossy codec in the mp3-HD channel, and will also allow
correct overload monitoring and mitigation.
The mp3-HD lossy core takes the parameters:
Bitrate Selectable from 96kbps to 320kbps
Mode Selectable from CBR to VBR Very High
Quality Low/Fast
However, remember that if the Bitstream Level Trim is used to mitigate the core codec
overload, and if that same trim value is applied to the mp3-HD encoder input, then both the
lossless and the lossy data streams will be trimmed.
Also note that, under normal circumstances, if the lossless codec Bitstream Level Trim is
non-zero to avoid clipping in the lossy chain for an offline encode that uses the online trim
values, then the resulting decoded output file will not be lossless because the level has
changed.
5.2 Dither, Truncation and Lossless Codecs
When encoding online, or preparing a session for render through the DAW, it is essential to
provide the input to the lossless codecs with a correctly dithered and truncated audio data
stream. As stated above, the plug-in should be the last element of the processing chain, and a
dither/truncation plug-in should immediately precede it, if the lossless codecs are to be used.
When a lossless codec is selected for audition, the FFT display area changes slightly to
include an input bit-meter for the left-hand scale. This bit-meter is included specifically to
help select the correct dither/truncation settings for the signal into the codec.
There is one segment per bit for bits 1 to 24 (see right). One large segment at the
bottom indicates any activity in bits higher than 24.
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