User Manual

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’.