d&b audiotechnik 10D Manual page 39

d&b 10D/30D Manual 1.10 en
Digital
NOTICE!
When both inputs are activated and locking to the sync source is
not possible, none of the inputs will receive any audio signal.
If two digital signals are used at the same time, these signals must
be completely synchronous (i.e. must have the same synchronized
sampling rate).
A 2-channel digital audio signal is accepted by the respective
input.
Locking to either 48 or 96 kHz is indicated below (
this case, the sync source is input 2.
When both inputs are activated, either of them can be selected as
sync source.
Sync status messages
Message Description
Not locked The digital input receiver (DIR) is not locked.
In sync External clock OK.
If D1/2 and D3/4 are used as Master/Slave,
both clock signals (external/internal) are
synchronous.
Sync error If D1/2 and D3/4 are used as Master/Slave,
both clock signals (external/internal) are not
synchronous.
Syncing
The DSPs are synchronizing (transitional
state).
Use SRC The external clock is either 44.1 kHz or
88.2 kHz (in connection with SRC).
SRC SRC is switched on.
System clocking
To keep latency as short as possible, the system does not utilize
non-clocked (asynchronous) Sample Rate Converters (SRC).
The clock of the digital audio system is derived from an internal
crystal oscillator with a sampling rate of 96 kHz. Alternatively, the
clock can be derived from a signal fed to the digital inputs. The
sampling rate of this signal must also be 96 kHz. The derived clock
is PLL filtered to avoid possible jitter.
It is also possible to use a signal with a sampling rate of 48 kHz as
it is in even proportion to the required 96 kHz. In this case, the
system detects the sampling rate and automatically doubles it using
a synchronous sampling rate doubler to achieve the required
96 kHz. The required filtering is calculated using linear phase FIR
filters.
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