RME HDSP 9652 [16/75] Clock modes synchronisation
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RME HDSP 9652 [16/75] Clock modes synchronisation

RME HDSP 9652 [16/75] Clock modes synchronisation
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User's Guide HDSP System HDSP 9652 © RME
About
This tab includes information about the driver and the card’s firmware version.
Lock Registry uses a password to prevent changes of the settings stored in the registry. All
settings are still changeable temporarily. As the settings are always loaded from the registry
when starting the computer, this method provides an easy way to define a specific initial state of
the HDSP system.
11.2 Clock Modes - Synchronisation
In the digital world, all devices are either the ‘Master’ (clock source) or a ‘Slave’ synchronized to
the master. If several digital devices are to be used simultaneously in a system, they not only
have to operate with the same sample frequency but also be synchronous with each other. This
is why digital systems always need a single device defined as ‘master’, which sends the same
clock signal to all the other (‘slave’) devices.
Remember that a digital system can only have one master! If the HDSP’s clock mode is
set to 'Master', all other devices must be set to ‘Slave’.
The Hammerfall DSP’s intelligent clock control is very user-friendly, being able to switch be-
tween clock modes automatically. Selecting AutoSync will activate this mode.
AutoSync guarantees that normal record and record-while-play will always work correctly. In
certain cases however, e.g. when the inputs and outputs of a DAT machine are connected di-
rectly to the Hammerfall DSP, AutoSync may cause feedback in the digital carrier, so synchro-
nization breaks down. To remedy this, switch the HDSP’s clock mode over to 'Master'.
The HDSP 9652’s ADAT optical input
and the SPDIF input operate
simultaneously. As there is no input
selector, the HDSP has to be told
which of the signals is the sync
reference (a digital device can only
be clocked from a single source).
This is why the system has been
equipped with automatic clock
source selection, which adopts the
first available input with a valid digital
signal as the clock reference input.
The input currently used as sync
reference is shown in the AutoSync
Ref status field, together with its
sample frequency.
Via Pref. Sync Ref (preferred
synchronization reference) a
preferred input can be defined. As
long as the card sees a valid signal
there, this input will be designated as
the sync source, otherwise the other
inputs will be scanned in turn. If none
of the inputs are receiving a valid
signal, the card automatically
switches clock mode to ‘Master’.

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