Steinberg Nuendo DD8 Mode D'emploi page 26

EXT.
With EXTERNAL, the Nuendo DD 8's word clock input is used as clock ref-
erence. The LED will flash slowly, if the word clock is missing or unusable.
INT
For INTERNAL, 44.1 kHz or 48 kHz sampling rate is available. If DS is ac-
tive in the left part, the data will be transmitted in Sample Split format
(S/MUX, Double Line). If DS is active in the right part, the output sample
rate doubles to 88.2 kHz or 96 kHz.
❐
For the INTERNAL clock setting it is mandatory that the clock rate of the
sources is synchronous to the Nuendo DD 8. Therefore the external device
has to be synchronized to the Nuendo DD 8's word clock out or AES/TDIF/
ADAT out.
The Nuendo DD 8 thus has to be master, all devices connected to it
slave (exception: SRC mode). In order to avoid clicks and drop outs in
this operating mode due to faulty or missing synchronicity, a special
process called SyncCheck compares the incoming data and the Nu-
endo DD 8's internal clock. Like LOCK, SYNC is indicated by flashing (er-
ror) or constantly lit (OK) LED. While LOCK is also indicated with the
source LEDs, SyncCheck steers the four SYNC LEDs. Besides, the flash-
ing frequency is twice as high.
8.2 Lock, SyncCheck and SyncAlign
Digital signals consist of a carrier and the data. If a digital signal is ap-
plied to an input, the receiver has to synchronize to the carrier clock in
order to read the data correctly. To achieve this, the receiver has a PLL
(Phase Locked Loop). As soon as the receiver has locked to the exact
frequency of the incoming signal, it is locked. This Lock state remains
even with small changes of the frequency, because the PLL tracks the
receiver's frequency.
If an AES, TDIF or ADAT signal is applied to the Nuendo DD 8, the corre-
sponding input LED stops flashing. The device indicates LOCK, i. e. a
valid input signal.
NUENDO DD 8
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