Technical data

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88
Manual SDs-01 D 3.2.2003 17:45 Uhr Seite 16
This setting allows to receive an ADAT
TM
/ SMUX4 signal with clock rates
between 100.0kHz and 200.0kHz and an 8-channel AES3 signal between
25.0kHz and 200.0kHz simultaneously. The format and sampling rate con-
version procedure is the same as described on page 21. 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 the internal clock generator running
at »96.0k« selected as clock reference.
X-SRC Mode between
ADAT
TM
and AES3
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
Bi-directional Format with Sampling Rate Conversion between
ADAT
TM
/ SMUX4 and AES3
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
This setting is a very special and of course unique function of your MC-4!
The function allows to convert an ADAT
TM
signal into an AES3 signal and an
AES3 signal into an ADAT
TM
signal at the same time, whereas both conversion
streams may consist of different sampling rates. On this occasion, the MC-4
extracts the clock out of the two incoming digital audio signals and uses
these clock references to synchronize the SRCs in front of each of the format-
same outputs. This is especially useful when interconnecting two unsynchro-
nized digital audio devices, each running on its own internal clock base.
A standard application is the interconnection of a digital mixing desk and a
digital multichannel effects processor. Please see the following sketch to get
an overview:
This setting allows to receive an ADAT
TM
signal with up to 50.0kHz sampling
rate and an 8-channel AES3 signal between 32.0kHz and 192.0kHz simulta-
neously. The ADAT
TM
input signal is converted to AES3 and the AES3 signals
are converted to the ADAT
TM
. The clock rate of the incoming ADAT
TM
signal
is extracted by the first PLL synthesizer and supplied as clock reference to
the second SRC, which feeds the ADAT
TM
output. The clock rate of the inco-
ming AES3 signal is extracted by the second PLL synthesizer and supplied as
clock reference to the first SRC, which feeds the AES3 output.
Format of Optical Outputs
The ADAT
TM
optical outputs follow
the clock rate of the ADAT
TM
optical
input signal. So both, the ADAT
TM
input and
output are of same format at any time. A con-
version from e.g. ADAT
TM
to ADAT
TM
/ SMUX2
is not possible in the X-SRC mode!
!
22
Input:
ADAT
TM
44.1kHz
Output:
ADAT
TM
44.1kHz
Output:
AES3
48.0kHz
Input:
AES3
48.0kHz
1. PLL:
Clock Extraction
44.1kHz
2. SRC:
Clock Conversion
44.1kHz ← 48.0kHz
2. PLL:
Clock Extraction
48.0kHz
1. SRC:
Clock Conversion
44.1kHz → 48.0kHz
Clock
44.1kHz
Clock
48.0kHz
MC-4: X-SRC Mode
Effects Processor
44.1kHz
Digital Mixing Desk
48.0kHz