RME HDSPe AIO [18/81] Clock modes synchronisation
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RME HDSPe AIO [18/81] Clock modes synchronisation

RME HDSPe AIO [18/81] Clock modes synchronisation
18
User's Guide HDSPe AIO © RME
DDS
Activates all settings of this dialog.
Value
Shows the sample rate as adjusted in
this dialog. The sample rate is defined
by the basic setting (Frequency), the
multiplier, and the position of the acti-
vated fader.
Frequency
Sets a fixed basic sample rate, which
can be modified by multiplier and
fader.
Freq. Multiplier
Changes the basic sample rate into
Single, Double or Quad Speed mode.
Coarse
Fader for coarse modification of the
basic sample rate. Click Active to acti-
vate it. Minimum step size 1 Hz.
Fine
Fader for fine modification of the basic
sample rate. Click Active to activate it.
Minimum step size 1 Hz.
Notes on the faders
A mouse click within the fader area, above or below the fader know, will move the fader with the
smallest step size up or down. Holding the Ctrl key while clicking will cause the fader to jump to
its center (0).
11.3 Clock Modes - Synchronisation
In the digital world, all devices are either the ‘Master’ (clock source) or a ‘Slave’. If several digi-
tal 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 HDSPe’s clock mode is
set to 'Master', all other devices must be set to ‘Slave’.
The HDSPe AIO’s intelligent clock control is very user-friendly, being able to switch between
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'.
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 playback, without having to syn-
chronize the card to the input signal first. It also allows immediate playback at any sample rate
without having to reconfigure the card.

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