RME HDSP 9652 [43/75] Operation

User's Guide HDSP System HDSP 9652 © RME

The HDSP 9652’s word clock input can be high-impedance or terminated internally, ensuring

maximum flexibility. If termination is necessary (e.g. because HDSP 9652 is the last device in

the chain), bring jumper X105 on the Expansion Board into position 75 Ohm.

In case the HDSP 9652 resides within a chain of devices receiving word clock, plug a T-adapter

into its BNC input jack, and the cable supplying the word clock signal to one end of the adapter.

Connect the free end to the next device in the chain via a further BNC cable. Remove jumper

X105 from the Expansion Board. The last device in the chain should be terminated using an-

other T-adapter and a 75 Ohm resistor (available as short BNC plug). Of course devices with

internal termination do not need T-adaptor and terminator plug.

23.3 Operation

The HDSP 9652's word clock input is active when Pref. Sync Ref in the Settings dialog has

been set to Word Clock, the clock mode AutoSync has been activated, and a valid word clock

signal is present. The signal at the BNC input can be Single or Double Speed, the Hammerfall

DSP automatically adapts to it. As soon as there is a valid signal at the BNC jack, AutoSync Ref

will display Word. This message has the same function as the green Lock LED, but appears on

the monitor, i.e. the user can check immediately whether a valid word clock signal is present

and is currently being used.

In the line Freq., the AutoSync Ref shows the frequency of the reference signal, measured by

the hardware. In this case the frequency of the current word clock signal is measured and dis-

played.

The word clock output of the Hammerfall DSP is constantly active, providing the current sample

frequency as word clock signal. As a result, in Master mode the provided word clock is defined

by the currently used software. In Slave mode, the provided frequency is identical to the one

present at the currently chosen clock input. When the current clock signal fails, the Hammerfall

DSP switches to Master mode and adjusts itself to the next, best matching frequency (44.1 kHz,

48 kHz etc.).