Manual Lynx LS-AES (page 16 of 20) (English)

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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

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Lynx LS-AES Manual

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