Yellowtec PC Audio Interface User Manual page 7

Working with application software
Adapting analogue level standards
Depending on its GPI settings PUC can handle maximum levels of +15dBu resp. +18dBu
at the analogue inputs and outputs. This is related to the specified reference levels of
+6dBu resp. +4dBu only by the settings (default or user) of your application software.
If PUC is operated in delivery status (+15dBu max. level), your application software needs
to be set in the way that reference level is 9dB lower than maximum level. This complies
to german studio standards.
If you operate your PUC with the GPI "INT LVL" activated (i.e. +18dBu max. level), your
application software needs to be set in the way that reference level is 14dB lower than
maximum level (i.e. +4dBu). This complies to common international studio standards.
see also page 4: Audio Options
Adapting digital audio formats
Audio format settings of your application software must correspond to the format of the
audio signal that is fed into the digital input of your PUC. These are basic settings, e.g.
- sample rate (e.g. 32kHz, 44.1kHz, 48kHz)
- resolution (be concerned: PUC max. 16bit)
- mono/stereo
Multichannel operation
It is possible to set up multichannel systems with several PUCs. In theory the maximum
number of channels depends on USB data thruput. But in practice it depends on the inter-
action of all system components like PC hardware, operation system, application software.
Note: In theory it is possible to transfer more than 16 stereo audio signals simultaneously via USB 1.1
Copy Protection (SCMS)
PUC provides SCMS ("Serial Copy Management System"), which restricts the copying
of audio data in the digital S/PDIF format.
Original audio data with copy protection (active "copy bit") can only be copied once in
the digital S/PDIF format. If this copy is fed to a device with SCMS, it will not be accepted.
According to RIAA conventions all consumer digital audio recorders are equipped with
SCMS (MiniDisc, CD-R Audio, DAT, etc.).
PUC will switch over to the analogue inputs when a copy of protected audio material is fed
to its S/PDIF input. In this case use the analogue audio format.
Audio data played back through PUC is marked as original audio data with copy protection.
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