RME HDSP 9632 [19/87] Clock modes synchronisation
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RME HDSP 9632 [19/87] Clock modes synchronisation

RME HDSP 9632 [19/87] Clock modes synchronisation
User's Guide HDSP System HDSP 9632 © RME
19
Application examples
DDS allows for a simultaneous change of speed and tune during record and playback. From
alignment to other sources up to creative effects – everything is possible..
DDS allows to intentionally de-tune the complete DAW. This way, the DAW can match instru-
ments which have a wrong or unchangeable tuning.
DDS allows to define a specific sample rate. This feature can be is useful in case the system
randomly changes the sample rate – for unknown reasons. It also prevents a change from Dou-
ble Speed (96 kHz) to Single Speed (48 kHz), which would cause configuration and routing
problems by the changed amount of ADAT channels.
11.3 Clock Modes - Synchronisation
In the digital world, all devices are either the ‘Master’ (clock source) or a ‘Slave’ synchronized to
the master. Whenever several devices are linked within a system, there must always be a sin-
gle master clock. The Hammerfall DSP’s intelligent clock control is very user-friendly, being able
to switch between clock modes automatically. Selecting AutoSync will activate this mode.
In AutoSync mode, the system
constantly scans all digital inputs
for a valid signal. If this signal
corresponds with the current
playback sample rate, the card
switches from the internal quartz
(AutoSync Ref displays 'Master')
to a clock generated from the
input signal (AutoSync Ref dis-
plays 'Slave'). This allows on-the-
fly recording, even during play-
back, without having to synchro-
nize the card to the input signal
first. It also allows immediate
playback at any sample rate with-
out having to reconfigure the
card.
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 directly to
the Hammerfall DSP, AutoSync may cause feedback in the digital carrier, so synchronization
breaks down. To remedy this, switch the HDSP’s clock mode over to 'Master'.
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 ADAT optical input and the SPDIF input operate simultaneously. Be-
cause there is no input selector however, 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 sys-
tem 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.

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