43
E
5.4 Digital audio connections per AES/EBU (Optional)
The AES/EBU* interface is the most widely used digital interface for professional audio devices. The connec-
tion is balanced, negative earth, using bipolar shielded cable with XLR connectors. We recommend the use of
a high quality low capacitance cable capable of transmitting the wide bandwidth signal (with frequencies of over
3 MHz) error free. The AES/EBU signal can carry, in addition to the pure audio material (up to 24-bit), various
code signals using a built in emphasis, including the sampling rate present, time code information and user-
definable bits. The S/P-DIF* digital format found in consumer products has similarities in its data structure to
the AES/EBU format. It is in principle possible to connect an S/P-DIF device to the ULTRA-CURVE 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 adaptor. 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.
Fig. 5.3: Adaptor S/P DIF Out > ULTRA-CURVE PRO AES/EBU In
Connecting from the ULTRA-CURVE PRO AES/EBU output to an S/P-DIF input will probably not work, be-
cause the copy prohibit 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 standard was developed in the early 1980s to allow electronic musical instruments from different
manufacturers to communicate with each other. The use of MIDI has developed over the intervening years to
the stage where it is now common to find complete recording studios operating entirely on a MIDI basis. The
centrepiece 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-CURVE PRO may be controlled in real time in this
studio environment.
+
AES stands for Audio Engineering Society, EBU for European Broadcasting Union, S/P-DIF for
Sony Philips Digital Interface Format, MIDI for Musical Instruments Digital Interface.
The MIDI connectors found on the rear panel are of the universally used 5 pin DIN type. You require suitable
MIDI cables to connect the ULTRA-CURVE PRO to other MIDI devices. Normally complete cables will be
purchased for this use, you can of course make your own, using a high quality cable with two cores and
shielding (like microphone cable), with as connectors two good 180 degree DIN plugs. Pin 2 (center) is con-
nected 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 have a maximum length not exceeding 45 feet.
6. APPENDIX
6.1 Digital I/O
The digital AES/EBU Input and Output consists of an additional circuit board with the driver software for the
AES/EBU connections, the XLR connectors and balancing transformers, plus an update for the operating
software.
6. APPENDIX
All manuals and user guides at all-guides.com
Summary of Contents for ULTRA-CURVE PRO DSP8024
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