Manual

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OPERATION
OPERATION
OPERATION
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Manual SDs-01 E 6.2.2003 18:18 Uhr Seite 13
17
Formats accepted via AES/EBU inputs
The MC-4’s AES/EBU inputs generally accept
AES3, AES11 and S/P-DIF signal formats for
conversion to the available output formats.
Unidirectional Format and Sampling Rate Conversions
X-SRC
12
BI-DIR
UNI-DIR ADAT
1
SMUX4
1
SRC
REFERENCE
IN 3
IN 2
IN 1
IN 4
SMUX4
SMUX2
ADAT
AES3
88.2
48.0
44.1
32.0
192.0
96.0
176.4
MODE
SMUX2
1
AES3
2
AUDIO IN
S/P-DIF
S/P-DIF
AES11
WCLK
This setting e.g. allows to receive an ADAT
TM
signal with up to 50.0kHz
sampling rate. The signal‘s audio format will be converted into AES3,
S/P-DIF and ADAT
TM
or SMUX2 /4 simultaneously, as in the previous section
described. Additionally to the format conversion a SRC process is added.
The sampling rate of all outputs now depends on the clock rate of the refe-
rence clock signal, which is selected in the »REFERENCE« menu. The above
example shows Word Clock (»WCLK«) selected as clock reference, which is
the default setting.
In this mode, the following clock references are available for synchronizati-
on of the internal SRCs:
WCLK, SCLK
AES11 (through separate input at the rear)
AES3 IN1– 4, every of the AES3 stereo inputs
Internal clock oscillator
To activate a clock source enter the »REFERENCE« menu by pressing the
MENU key and press the »SELECT« key repeatedly. When the external clock
reference signal can be successfully locked, the blue LED »LOCK
1
« in the
»STATUS« menu lights constantly and the clock rate of the clock source is
displayed in the »CLOCK IN« menu under »1«.
Individual AES3 Input Signals
Running the MC-4 in the SRC mode, the clock rates of indivudual AES3
input signals can be totally different within a range of 25.0kHz to 200.0kHz.
It is also not necessary to feed in signals at all four AES3 inputs. The input
assignment is passed to the outputs.
Further Setting Examples
External Clock References
Internal
Clock
Reference
ADAT
TM
/ SMUX Adaption
with SRC Option
Does the reference clock signal not
exceed 50.0kHz, both optical outputs trans-
mit the same ADAT
TM
signal and the MC-4
functions as ADAT
TM
signal splitter.
If the reference clock exceeds 50.0kHz, the
optical output format will automatically
change to »SMUX2« or »SMUX4«, depending
on the reference signal‘s clock rate. The
corresponding SMUX format of the optical
outputs is displayed in the »STATUS« menu.
!
Locking so-called
»Super Clocks«
Your MC-4 is able to lock so-called
»Super Clock« (SCLK) reference signals. The-
se clock signals are used preferably for older
digidesign ProTools™ MX systems. Speci-
fied are only two clock rates, 11.2896MHz +
12.288MHz, which are the x256 multiples of
the Word Clock rates 44.1kHz and 48.0kHz.
When locking one of these Super Clocks,
the rate will be inverted displayed in the
»CLOCK
IN « menu. Thus, the LED in front
of the corresponding base clock rate, that
means Word Clock rate, does not light while
all other LEDs light (see examples below).
!
REF CLOCK IN
88.2
48.0
44.1
32.0
192.0
96.0
176.4
1 2
REF CLOCK IN
88.2
48.0
44.1
32.0
192.0
96.0
176.4
1 2
Super Clock of
44.1kHz Word
Clock
Super Clock of
48.0kHz Word
Clock
X-SRC
12
BI-DIR
UNI-DIR ADAT
1
SMUX4
1
SRC
REFERENCE
IN 3
IN 2
IN 1
IN 4
SMUX4
SMUX2
ADAT
AES3
88.2
48.0
44.1
32.0
192.0
96.0
176.4
MODE
SMUX2
1
AES3
2
AUDIO IN
S/P-DIF
S/P-DIF
AES11
WCLK
X-SRC
12
BI-DIR
UNI-DIR ADAT
1
SMUX4
1
SRC
REFERENCE
IN 3
IN 2
IN 1
IN 4
SMUX4
SMUX2
ADAT
AES3
88.2
48.0
44.1
32.0
192.0
96.0
176.4
MODE
SMUX2
1
AES3
2
AUDIO IN
S/P-DIF
S/P-DIF
AES11
WCLK
Unidirectional format with sampling rate conversion from AES3 to ADAT
TM
or SMUX2 / 4,
S/P-DIF coaxial, AES3. AES11 is selected as clock reference for the internal SRCs.
Unidirectional format with sampling rate conversion from S/P-DIF coaxial to AES3, SMUX2.
When the internal clock basis is selected as clock reference with 96.0kHz, the ADAT
TM
output
signal is automatically converted into SMUX2 at the optical outputs. When sampling rates less
than 88.2kHz are selected, unidirectional conversion to an 8 channel ADAT
TM
signal is possible
from the 4 S/P-DIF inputs.