Word Clock; Midi - RME Audio Hammerfall Digiface User Manual

Note that in record or monitor modes, set emphasis bits will disappear. Recordings origi-
nally 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 (field SPDIF Out).
This setting is updated immediately, even during playback.
Note: Recordings with (pre-) emphasis show a treble boost (50/15 µs), which has to be com-
pensated at playback. Therefore, when selecting Emphasis all analog outputs will be processed
by a treble filter based on 50/15µs, which sounds like a high cut.
The Digiface's new output header is optimized for largest compatibility with other digital de-
vices:
32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 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
Professional AES/EBU equipment can be connected to the Digiface thanks to the transformer-
balanced coaxial output, and the 'Professional' format option with doubled output voltage. Out-
put cables should have the same pinout as those used for input (see above), but with a male
XLR plug instead of a female one.
Note that most consumer HiFi 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 often 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.

26.3 Word Clock

The Digiface's word clock input is a high impedance type (not terminated).
Thanks to a low impedance, but short circuit proof output, the Digiface delivers 4 Vpp to 75
Ohms. For wrong termination with 2 x 75 Ohms (37.5 Ohms), there are still 3.3 Vpp at the out-
put.
Selecting Single Speed in the Settings dialog causes the output signal to always stay within the
range of 32 kHz to 48 kHz. So at 96 kHz sample rate, the output word clock is 48 kHz.

26.4 MIDI

The Digiface offers two MIDI I/O via two 5-pin DIN jacks each. The MIDI ports are added to the
system by the driver. Using MIDI capable software, these ports can be accessed under the
name HDSP MIDI. Using more than one Digiface, the operating system adds a consecutive
number to the port name, like HDSP MIDI In (3) etc.
The MIDI In port is available for both GSIF (GSIF-2 Low Latency) and standard MME MIDI
simultaneously.
Note: The MIDI input LED displays any kind of MIDI activity, including MIDI Clock, MTC and
Active Sensing. The latter is sent by most keyboards every 0.3 seconds.
46
User's Guide HDSP System Digiface © RME