User`s guide

INSTALLING THE 896HD HARDWARE
28
Clocking scenarios for AES/EBU input
There are three possible clocking scenarios for the
896HD AES/EBU input:
1. Simple transfer (slave the 896HD system clock to
the AES/EBU input signal — no sample rate
conversion).
2. Sample rate convert the AES/EBU input.
3. Use word clock to resolve the 896HD system
clock and the other AES/EBU device with each
other.
These three AES/EBU input scenarios are
summarized below.
Some example scenarios are demonstrated below.
Simple AES/EBU input transfer (no rate convert)
Figure 3-18: Slaving the 896HD to an AES/EBU device. For the
896HD’s clock source, choose ‘AES/EBU’.
AES/EBU input with rate conversion
Figure 3-19: Rate-converting AES/EBU input.
AES/EBU input with word clock
Figure 3-20: In this scenario, the 896HD and other AES/EBU device are
both resolved to one another via a third master word clock source.
Clocking scenarios for AES/EBU output
The 896HD AES/EBU output can also employ
sample rate conversion. The output options, shown
below in Figure 3-21, are briefly summarized in the
following sections. For further details, see “Sample
Rate Conversion” on page 41.
Scenario 1 Scenario 2 Scenario 3
Description
Simple
transfer
Rate
convert
Use word
clock
896HD clock
source setting
AES/EBU Any setting
except
AES/EBU
Word Clock
Sample rate
conversion
setting
None AES In None
Required
896HD cable
connections
AES/EBU In AES In AES/EBU In
and Word
Clock In
Are the devices
continuously
resolved?
Yes No Yes
Is the signal
being sample
rate converted?
No Yes No
Example
application
Simple digital
transfer into
the 896HD
from DAT
deck or digi-
tal mixer.
Transfer from
digital mixer
running at a
different
sample rate.
Both the
896HD and
other AES/
EBU device
are slaved to
‘house” word
clock.
Master
Slave
AES/EBU OUT
AES/EBU IN
Other device
896HD clock source
setting: AES/EBU
896HD
896HD Sample Rate
Conversion setting: None
Master
Slave
AES/EBU OUT
AES/EBU IN
Other device
896HD clock source
setting: Internal
896HD
896HD Sample Rate
Conversion setting:
AES In
(Slave)
(Slave)
AES/EBU OUT/IN
AES/EBU IN/OUT
Other device
896HD clock source:
word clock
896HD
Word clock IN
Word clock IN
896HD Sample
Rate Conversion
setting: None
‘House’ word clock master