Technical data

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88
Manual SDs-01 D 3.2.2003 17:45 Uhr Seite 16
21
Bi-directional Format with Sampling Rate Conversion between
ADAT
TM
and AES3
This function allows to receive an ADAT
TM
signal with up to 50.0kHz sampling
rate and an 8-channel AES3 signal between 25.0kHz and 200.0kHz simultane
-
ously. The ADAT
TM
input signal is converted to AES3 and the AES3 signals are
converted to ADAT
TM
or ADAT
TM
/ SMUX2/4. The four AES3 stereo inputs and
the ADAT
TM
signal can consist of complete different sampling rates!
This is possible by adding a SRC process on all input channels to the stan-
dard format conversion. The sampling rate of all outputs now depends on
the clock rate of the reference clock signal, which is selected in the
»REFERENCE« menu. The above example shows the first AES3 stereo chan-
nel pair »IN1« selected as clock reference.
In this mode, the following clock references are available for synchronizati-
on of the internal SRCs:
WCLK, 25.0kHz – 200.0kHz, SCLK
11.2896MHz + 12.288MHz
AES11, 25.0kHz – 200.0kHz (through separate input at the rear)
ADAT
TM
, 25.0kHz –50.0kHz
AES3 IN1– 4, every of the AES3 stereo inputs, 25.0kHz – 200.0kHz
32.0kHz –192.0kHz, internal clock oscillator
To activate a clock source enter the »REFERENCE« menu and press the
»SELECT« button repeatedly. When the external clock reference signal can
be locked by the internal PLL circuit, the blue LED »LOCK
1
« in the STATUS
menu will light constantly. The clock rate of the selected clock source is
displayed in the »REF CLOCK IN« menu under »1«.
Bi-directional Format with Sampling Rate Conversion between
ADAT
TM
/ SMUX2 and AES3
In this conversion mode, the MC-4 accepts
the incoming AES3 signals with different
sampling rates per stereo input. Due to
this, it may be also useful to select one of
the stereo inputs as reference clock for the
internal SRCs!
This setting allows to receive an ADAT
TM
/ SMUX2 signal with clock rates bet-
ween 50.0kHz and 100.0kHz and an 8-channel AES3 signal between 25.0kHz
and 200.0kHz simultaneously. The format and sampling rate conversion
procedure is the same as described above. The format of the optical outputs
is displayed in the »STATUS« menu, the sampling rate of the incoming clock
reference signal is displayed in the »REF CLOCK IN« menu under »1«. The
above example shows »AES11« selected as clock reference.
Does the reference clock signal not
exceed 50.0kHz, both ADAT
TM
out-
puts transmit the same signal and
the MC-4 functions as ADAT
TM
signal splitter.
If the reference clock signal exceeds
50.0kHz, the ADAT
TM
output format will
be automatically changed to »SMUX2«
or »SMUX4«, depending on the reference
signal‘s clock rate. The corresponding SMUX
format of the ADAT
TM
outputs will be dis-
played in the STATUS menu.
!
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/PDIF
S/PDIF
AES11
WCLK
The S/PDIF interfaces do not have
any function in these conversion
modes, due to the lack of simulta-
neous useable inputs and outputs!
!
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/PDIF
S/PDIF
AES11
WCLK