Synchronisation; Digital Interface; S/Pdif In; S/Pdif Out - MINDPRINT TRIO Handbuch

®
MindPrint T.R.I.O.
9. DIGITAL-INTERFACE
T.R.I.O™ comes with a digital interface in optical S/PDIF format (TOSLINK)
that lets you integrate the device into a digital recording environment.

9.1 S/PDIF IN

The digital output of the DAW connects to this input via the
computer interface. The converted signal is sent directly to the
monitor buss.

9.2 S/PDIF OUT

This port connects to the DAW's S/PDIF digital input.
The A-to-D converted signals of the MIC/INSTR. and LINE
busses are sent to this port.

9.3 SYNC LED

This LED lights up when the S/PDIF input receives a viable
digital signal.
Synchronization
Affording flexible connections to digital studio environments,
T.R.I.O™'s digital interface features a three-way selector
providing all the options you need to configure a digital
setup.
9.4 44,1/48:
This button (in combination with the neighboring "x2" button) determines
the sampling rate for T.R.I.O™ in stand-alone mode.
Position 1 selects 44.1 kHz.
When set to position 2, T.R.I.O™ runs on 48 kHz.
9.5 x1/x2 (= Double Sampling Rate)
When this button is set to position 1, the device operates on the frequency
determined by the neighboring 44.1/48 button's setting. In position 2, the
device works with double the sampling rate defined by the 44.1/48 button;
that is, 88.2 kHz or 96 kHz.
y
Developed by SONY and Philips and standardized by the IEC in
1987, S/PDIF is designed for semiprofessional and home use.
Providing an unbalanced circuit, S/PDIF is today the de facto
standard worldwide.
S/P-DIF optical (TOSLINK)
The optical interface has some advantages over its electrical coaxial
counterpart:
• Special optical fiber cords rules out problems associated with using
the wrong cables.
• Many devices' optical ADAT interfaces may be set to S/PDIF optical
format.
• Galvanic separation prevents ground loops and pickup of stray
interference.
• Optical is more common than coaxial.
y
If your DAW offers coaxial rather than optical S/PDIF ports, you'll
find S/P-DIF optical-to-coaxial converters in well-stocked music
stores.
g The SYNC LED tells you that a viable signal is patched into the
S/PDIF INPUT. If your setup isn't working properly, this light helps
you narrow down the cause.
SYNCHRONIZATION
Once digital audio devices are connected, their internal clock frequen-
cies must be synchronized. To this end, one device acts as the master,
dictating the sampling rate and bit rate to the rest, which are called
slaves in this type of configuration. Symptoms such as popping noises
during recording are typical indications that devices aren't in sync and
that settings require review.
SAMPLING RATE
The sampling rate is the frequency at which digital audio signals are
measured (sampled) at discrete points in time. In the case of an audio
CD, this is 44,100 times per second, which equals a frequency of
44.1 KHz. As a rule, the higher the selected sampling rate, the "better"
the audio signal quality; that is, the more accurately the original analog
signal is rendered.
Note that higher sampling rates require proportionately more memory.
x
As both TRIO and the DAW can be work in MASTER mode, audible
interferences might occur because both units use their own
frequency. An indication for this is e.g. when the DAW playback
signal sounds dull and muddy. In case of doubt please double
check the sync settings of both units and make sure there is one
MASTER and one SLAVE.
y
T.R.I.O™'s digital interface processes audio at a resolution of up to
96kHz / 24bits.
19