User Manual

User’s Guide OctaMic XTC © RME

20.2 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 OctaMic XTC’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 digi-

tal 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 27.2.

20.3 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 Word, AES, MADI or ADAT. The clock

modes of all units have to be set up correctly in their Settings dialog.

21. DIGICheck Mac

The DIGICheck software is a unique utility developed for testing, measuring and analysing digi-

tal audio streams. Although this Windows software is fairly self-explanatory, it still includes a

comprehensive online help. DIGICheck 0.71 operates in parallel to any software, showing all

input data. The following is a short summary of the currently available functions:

• Level Meter. High precision 24-bit resolution, 2/8/24 channels. Application examples: Peak

level measurement, RMS level measurement, over detection, phase correlation measure-

ment, dynamic 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 visualization 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

oscilloscope-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

analysis, 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 chan-

nels and inputs or outputs!

To install DIGICheck, go to www.rme-audio.com, section Downloads / DIGICheck. Download

the latest version, unzip and run the installer. Follow the instructions prompted on the screen.