Digital Audio Connections Per Aes/Ebu (Optional); Midi Connections - Behringer ULTRA-DYNE PRO DSP9024 User Manual

ULTRA-DYNE PRO DSP9024

5.4 Digital audio connections per AES/EBU (optional)

The AES/EBU interface (Audio Engineering Society/European Broadcasting Union) is the most widely used
digital interface for professional audio devices. The connection is balanced, negative earth, using bipolar
shielded cable with XLR connectors. We recommend the use of a high quality, low capacitance cable
capable of the error-free transmission of the wide bandwidth signal (with frequencies of over 3 MHz). The
AES/EBU signal can carry, in addition to the pure audio data (up to 24-bit), various code signals including
built-in emphasis, the sampling rate, time code information and user-definable bits.
The S/P-DIF (Sony/Philips Digital Interface Format) digital format found in consumer products has similarities
in its data structure to the AES/EBU format. In principle, it is possible to connect an S/P-DIF device to the
ULTRA-DYNE PRO AES/EBU input, although this was not intended in the design of the two formats.
The S/P-DIF connector is normally an unbalanced RCA socket, requiring the use of an adapter. Connect the
tip of the RCA socket to pin 2 of the XLR, and the RCA shield to pin 3 of the XLR. The connection between the
two devices should be as short as possible.
Digital Output Signal flow ULTRA-DYNE PRO
S/PDIF
Input
Sleeve
Tip
Shield Cable
Fig. 5.3: ULTRA-DYNE PRO S/P DIF interface adapter
Connecting the ULTRA-DYNE PRO AES/EBU output to an S/P-DIF input will probably not work, because the
copy protection function present at the S/P-DIF device will be triggered by a channel status bit, or possibly
another AES/EBU defined bit, preventing data transfer.

5.5 MIDI connections

The MIDI (Musical Instruments Digital Interface) standard was developed in the early 1980s to allow elec-
tronic musical instruments from different manufacturers to communicate with each other. The use of MIDI
has developed over the years to the point where it is now common to find complete recording studios based
completely on MIDI.
The centerpiece in such a studio is usually a computer running a sequencer software which not only controls
various keyboards, samplers and sound modules, but can also run the programming of outboard effect
devices, typically digital reverberation and delay units. The ULTRA-DYNE PRO may be controlled in real time
in this studio environment.
The MIDI connectors found on the rear panel are of the universally used 5 pin DIN type. Suitable MIDI cables
are required to connect the ULTRA-DYNE PRO to other MIDI devices. Normally, complete cables can be
purchased for this application, but you can of course make your own, using a high quality cable with two
cores and shielding (such as microphone cable), and with two good 180° DIN plugs. Pin 2 (center) is
connected to the cable's shield, pins 4 and 5 (left and right next to 2) carry the two cores, pins 1 and 3 are not
used. MIDI cables should not exceed 45 feet in length.
MIDI IN: Used for the reception of MIDI control data. Select the receive channel in the SETUP menu.
MIDI THRU: The MIDI THRU socket can be used to receive incoming MIDI signals without modifying them. This
permits the chaining of multiple ULTRA-DYNE PROs.
MIDI OUT: MIDI OUT serves to send data to a connected computer or other ULTRA-DYNE PRO. Program data
and signal processing status information is transmitted via this output.
5. INSTALLATION 41