House Clock; Extended Modes; Multi-Card Operation - RME Audio HDSP 9632 User Manual

Word clock module

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9.2 House Clock

The high quality of the word clock signal offered by the HDSP 9632 allow to use the HDSP

9632 as house clock generator. To simpify this application, the WCM offers two electronically

decoupled word clock outputs.

Due to the HDSP 9632's outstanding clock control a synchronization of the output signal to the

input signal is not only possible at identical sample rates, but also at half, quarter, double and

quad sample rates. A playback of 192 kHz can be easily synchronized via a 48 kHz clock

source.

Example 1: A playback or recording at 44.1 kHz can be synchronized via an external signal of

44.1 kHz, 88.2 kHz or 176.4 kHz.

Example 2: A playback or recording at 192 kHz can be synchronized via an external signal of

48 kHz, 96 kHz or 192 kHz.

The input accepts all those frequencies fully automatically.

Like all ADAT ports, the word clock output operates in Single Speed mode only. At 96 kHz

or 192 kHz, the word clock output will therefore be a 48 kHz signal.

Later a flash update will allow to choose double and quad speed for the word clock output.

The WCM does not support multi-card operation directly. But that's not necessary anyway, as

multiple HDSP 9632, and also combinations with the HDSP 9652, can be sychronised in sev-

eral ways. Also for such a system of multiple cards, only one word clock input can be used at

all.

The synchronization of other cards to the word clock input of the HDSP 9632 can be done by

internal cabling from Sync Out (card 1) to CD/Sync/AEB In (card 2)

internal cabling ADAT Out (card 1) to CD/Sync/AEB In (card 2)

usage of the ADAT or SPDIF optical output (card 1) to input card 2

word clock output (card 1) to word clock input (card 2)

In all cases the cards will operate with sample-accuracy, provided the correct setting has been

chosen in the Settings dialog.

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