General Operation; Using More Than One Hammerfall Dsp; Special Characteristics Of The Spdif Output - RME Audio Hammerfall HDSP 9632 User Manual

10.3 General Operation

The green 'Lock' LED at the Expansion Board will light up when the input detects a valid word
clock signal. Selecting 'Word Clock' in the 'Clock Mode' field will switch clock control over to
the word clock signal. 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.
Like all ADAT ports, the word clock output operates in Single Speed mode only. At 96 kHz,
the word clock output will therefore be a 48 kHz signal.

11. Using more than one Hammerfall DSP

The current drivers support multiple interfaces and any combination of I/O-boxes
(Multiface/Digiface/HDSP 9652/HDSP 9632). Please note that only one ADAT Sync can be
used (of course). Additional all systems must be in sync, i.e. have to receive valid sync
information (either via wordclock or using AutoSync).

12. Special Characteristics of the SPDIF Output

Apart from the audio data itself, digital signals in SPDIF or AES/EBU format have a header
containing channel status information. False channel status is a common cause of malfunction.
The Hammerfall DSP ignores the received header and creates a totally new one for the output
signal.
Note that in record or monitor modes, set emphasis bits will disappear. Recordings originally
done with emphasis should always be played back with the emphasis bit set!
This can be done by selecting the 'Emphasis' switch in the Settings dialog ('SPDIF Out'). This
setting is updated immediately, even during playback. The Hammerfall DSP's new output
header is optimized for largest compatibility with other digital devices:
32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176,4 kHz, 192 kHz depending on the current
sample rate
Audio use, Non-Audio
No Copyright, Copy Permitted
Format Consumer or Professional
Category General, Generation not indicated
2-channel, No Emphasis or 50/15 µs
Aux bits Audio Use
For AES/EBU output operation the optional digital XLR breakout cable is required, as the phono
output has too low voltage for a reliable operation in AES format.
Note that most consumer-orientated equipment (with optical or phono SPDIF inputs) will
only accept signals in 'Consumer' format!
The audio bit in the header can be set to 'Non-Audio'. This is necessary when Dolby AC-3
encoded data is sent to external decoders (surround-sound receivers, television sets etc. with
AC-3 digital inputs), as these decoders would otherwise not recognize the data as AC-3.
User's Guide Hammerfall DSP 9632 © RME
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