Lynx LS-AES, Руководство пользователя

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LS-AES
Page 14
Clocking and Synchronization
The Clock Source control on the LStream page of the LynxTWO/L22 Mixer provides LS-AES clock
source selection as follows:
Clock Source Selection Action
Slave LS-AES clock is slaved to the host card system clock source. The
system clock source is selected on the Adapter page of the Mixer.
Digital In 1 The word clock derived from the digital IN 1 port is the clock source
for the LS-AES and host card.
Digital In 2 The word clock derived from the digital IN 2 port is the clock source
for the LS-AES and host card.
Digital In 3 The word clock derived from the digital IN 3 port is the clock source
for the LS-AES and host card.
Digital In 4 The word clock derived from the digital IN 4 port is the clock source
for the LS-AES and host card.
Important: If a clock source other than Slave is used, the LynxTWO/L22 clock source must also be
set to Header in the Adapter page of the Mixer .
To insure glitch- free recording and playback using external AES devices
without enabling the LS-
AES’s sample rate converters , the LS-AES, host LynxTWO/L22, and external AES devices must run
synchronously from a common clock source. There are only two scenarios to consider that satisfy this
requirement:
1. The LynxTWO/L22 host card is the clock master. The LS-AES and external AES devices
must run in clock slave mode. This case includes host card synchronization to external clocks
such as word clocks and composite video.
2. An external AES device is the clock master. The LS-AES clock source must be derived from
one of its digital inputs and the host card clock source must be set to Header.
When the sample rate converter is enabled on a particular digital input of the LS-AES, the device
driving the LS-AES does not have to run synchronously with the LS-AES. Data received from the
input will be sample rate converted to rate of the clock source selected for the LS-AES.
Dual Card Systems
When using two LS-AES cards with one LynxTWO/L22, the clock source of at least one of the two
cards
must be set to Slave . Failure to due so will cause unstable clock generation.
To select a digital input from a second LS-AES (at LStream bus address 1) as the clock source:
•
Select one of the Digital In clock sources (1-4) from the LStream 1 page
•
Set the clock source on the LStream 2 page to Slave
•
Select Header as the host card’s clock source in the Adapter page of the LynxTWO/L22
Mixer