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8. Operation and Usage
8.1 Playback
In the audio application being used, Digiface Ravenna must be selected as output device. This
can often be found in the Options, Preferences or Settings menus as Playback Device, Audio
Devices, Audio etc.
Increasing the number and/or size of audio buffers may prevent the audio signal from breaking
up, but also increases latency i.e. output is delayed. For synchronized playback of audio and MIDI
(or similar), be sure to activate the checkbox 'Get position from audio driver'.
Note: This is a network audio interface. In a network, clock definition is of particular importance.
Therefore neither WDM nor ASIO are allowed to influence the sample rate. That setting is done
exclusively by the RAVENNA Remote.
8.2 DVD-Playback (AC-3/DTS)
AC-3 / DTS
Popular DVD software players can send their audio data stream to any AC-3/DTS capable re-
ceiver via the Digiface Ravenna.
!
The sample rate must be set to 48 kHz in the RAVENNA Remote, or the software will only
playback a stereo 2-channel downmix via SPDIF.
In some cases the Digiface Ravenna output device has to be selected in >Control Panel / Sound
/ Playback< and be set as Default, or the software will not recognize it.
The DVD software's audio properties now show the options 'SPDIF Out' or similar. When selecting
it, the software will transfer the non-decoded digital multi-channel data stream to a Digiface Ra-
venna output channel.
Warning: This 'SPDIF' signal sounds like chopped noise at highest level.
Multichannel
PowerDVD and WinDVD can also operate as software decoder, sending a DVD's multichannel
data stream directly to the analog and digital outputs of the Digiface Ravenna. For this to work
select the WDM playback device 'Loudspeaker' of the Digiface Ravenna in >Control Panel/
Sound/ Playback < as 'Standard'. Additionally a Multi-channel WDM device is required, whose
property of 7.1 Loudspeaker playback can be verified under >Configuration<.
PowerDVD's and WinDVD's audio properties now list several multichannel modes. If one of these
is selected, the software sends the decoded analog multichannel data to the Digiface Ravenna.
On some software it is not necessary to select the Loudspeaker in the Sound panel.
8.3 Channel Count under WDM
The Digiface Ravenna supports a maximum of 64 channels for stereo WDM, and 128 channels
in multichannel WDM. Configuration is done via the Settings dialog - WDM Devices, as Stereo or
Multi-channel (8-channel) devices.
In Double Speed mode the number of available channels is halved for both RAVENNA and MADI.
In Quad Speed mode the number of available channels is reduced to 16 channels for both
RAVENNA and MADI.
User's Guide Digiface Ravenna © RME
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Table of Contents
Troubleshooting
