Clock Modes - Synchronization; Multi-Interface Operation; Digicheck Mac - RME Audio ADI-2 Pro SE User Manual

27.2 Clock Modes - Synchronization

In the digital world, all devices must be either Master (clock source) or Slave (clock receiver).
Whenever several devices are linked within a system, there must always be a single master clock.
!
A digital system can only have one master! If the ADI-2/4 Pro SE's clock mode is set to 'In-
ternal', all other devices must be set to 'Slave'.
To cope with some situations which may arise in studio practice, defining a sync reference is
essential. RME's exclusive SyncCheck technology enables an easy to use check and display of
the current clock status. In the State Overview screen the column SYNC will show for all digital
inputs whether there is a valid signal (Lock, No Lock) for the optical input, or if there is a valid and
synchronous signal (Sync). See chapter 15.3.
The SRC (Sample Rate Converter) can be used to de-couple the clocking, allowing to use more
than one clock master in a digital setup. See chapter 8.6 for details.

27.3 Multi-interface Operation

OS X supports the usage of more than one audio device within an audio software. This is done
via the Core Audio function Aggregate Devices, which allows to combine several devices into
one. All units have to be in sync, i.e. have to receive valid sync information via a digital input
signal, then all channels can be used at once.
If one of the devices is set to clock mode Master, all others have to be set to clock mode Slave,
and have to be synced from the master by feeding AES, SPDIF, Word or ADAT. The clock modes
of all units have to be set up correctly in their Settings dialog.
28. DIGICheck & DigiCheck NG Mac
The DIGICheck software is a unique utility developed for testing, measuring and analysing digital
audio streams. Although this software is fairly self-explanatory, it still includes a comprehensive
online help. DIGICheck and its latest incarnation, DigiCheck NG v0.89, operate in parallel to any
software, showing all input data. The following is a short summary of the currently available func-
tions:
 Level Meter. High precision 24-bit resolution, 2/8 channels. Application examples: Peak level
measurement, RMS level measurement, over detection, phase correlation measurement, dy-
namic range and signal-to-noise ratios, RMS to peak difference (loudness), long term peak
measurement, input check. Oversampling mode for levels higher than 0 dBFS. Supports vis-
ualization according to the K-System.
 Spectral Analyser. World wide unique 10-, 20- or 30-band display in analog bandpass filter
technology. 192 kHz-capable!
 Vector Audio Scope. World wide unique Goniometer showing the typical afterglow of a oscil-
loscope-tube. Includes Correlation meter and level meter.
 Totalyser. Spectral Analyser, Level Meter and Vector Audio Scope in a single window.
 Surround Audio Scope. Professional Surround Level Meter with extended correlation analy-
sis, ITU weighting and ITU summing meter.
 ITU1770/EBU R128 Meter. For standardized loudness measurements.
 Bit Statistics & Noise. Shows the true resolution of audio signals as well as errors and DC
offset. Includes Signal to Noise measurement in dB and dBA, plus DC measurement.
 Completely multi-client. Open as many measurement windows as you like, on any channels
and inputs or outputs!
DIGICheck is constantly updated. The latest version is always available on our website www.rme-
audio.com, section Downloads / Software / DIGICheck NG.
User's Guide ADI-2/4 Pro SE – v 1.0
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