Sonnox Fraunhofer Pro-Codec User Manual
Page 81
9.3 Codec Specifications
9 SPECIFICATIONS
A Sonnox Fraunhofer Pro-Codec is instantiated and shows the default codec as AAC-LC
192 kpbs. Note the usual default of 256 kbps is not valid for a mono WAV file (see section
for the full table of codec supported sample rates).
If the 22.05 kHz file is selected, and play stopped and re-started, the codec will
automatically select 28 kbps (which is the closest to 192 kbps that the codec supports at
22.05 kHz).
If the 44.1 kHz file is now selected, and play stopped and re-started, the codec will
automatically select 56 kbps (the closest to 28 kbps that the codec supports at 44.1
kHz).
Example 2: Different session sample rates and incompatible codec bit rates
Using WaveLab 7, set up two wav files in the tabbed windows in the audio file workspace.
One is stereo 24 bit 32 kHz, and is currently selected and playing. The unselected tab has
a stereo 24 bit 48 kHz WAV file associated with it.
A Sonnox Fraunhofer Pro-Codec is instantiated. As the HD-AAC codec does not support
32 kHz, the HD-AAC option does not appear in the codec selection window.
The transport is stopped, and the 48 kHz file is selected. The user now tries to select the
HD-AAC codec, but it is still not available as an option. After the transport is set to play,
the codec can be changed to HD-AAC. The file plays normally and the plug-in and codec
perform normally.
The transport is stopped, and the 32 kHz file is re-selected. Now, if the transport is set to
play, the codec will receive invalid audio data, and the plug-in will substitute an AAC-LC
codec.
Quit and re-start WaveLab 7. Select a 32 kHz wav but do not press play. Instantiate the
Pro-Codec. At this moment the plug-in has not picked up the correct session data
because WaveLab has not been set to play. The plug-in has been defaulted to 44.1 kHz.
Note it is possible now to select HD-AAC but, if this is done, the plug-in will substitute an
AAC-LC when playback starts.
Now try to load a preset saved from a 32 kHz session. The preset will be greyed out in the
load preset menu, and cannot be loaded. To progress, press
PLAY, then STOP, and then
load the Preset.