MUTEC MC-4 - Manual (Page 20)

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Manual SDs-01 D 3.2.2003 17:45 Uhr Seite 16
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 is a very special and unique function of your MC-4!
The X-SRC mode allows to convert an ADAT TM signal into an 8-channel AES3
signal and an 8-channel AES3 signal into an ADAT TM or SMUX2/4 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 unsynchronized or unsynchronizable 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:
In this example, an ADAT TM signal with 44.1kHz sampling rate and an 8-
channel AES3 signal with 48.0kHz sampling rate are feed in simultaneously.
The ADAT
TM input signal is converted to AES3 and the AES3 signals are con-
verted to 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 optical ADAT
TM output. The clock rate of the incoming
AES3 signal is extracted by the second PLL synthesizer and supplied as clock
reference to the first SRC, which feeds the AES3 output.
In this mode, the following clock references are available for synchronizati-
on of the internal SRCs:
ADAT TM (predefined with input selection)
SMUX2 (predefined with input selection)
SMUX4 (predefined with input selection)
AES3 IN1– 4, every of the AES3 stereo inputs
The optical ADAT TM input is predefined as clock source for the second SRC,
the optical ADAT TM output. As for the AES3 outputs, one of the four AES3
stereo inputs must be defined as clock source for the first SRC. Therefore
enter the »REFERENCE« menu and press the »SELECT« key repeatedly to
select one of the AES3 inputs »IN1 – 4«. The example above shows the first
AES3 input »IN1« selected as clock reference for the AES3 signal path.
When the external clock reference signals can be locked by the PLLs, the
blue LEDs »LOCK
1
« and »LOCK
2
« in the STATUS menu light constantly. The
clock rate of the clock sources are displayed in the »CLOCK IN « menu under
»1« and »2«. The identifier »1« generally indicates the lock status and clock
rate of the ADAT
TM or SMUX clock references. The identifier »2« indicates
the lock status and clock rate of the selected AES3 clock reference.
Format of Optical Outputs
The optical outputs follow the clock
rate of the ADAT TM or SMUX input si-
gnal. Thus, both the optical input and output
are of equal format at any time!
!
20
X-SRC Mode
No External Clock Needed
Using the X-SRC mode, the MC-4
extracts the needed clock rates out
of the incoming digital audio signals. There-
by, the system does not need and does not
accept any additional external applied clock
reference signals.
!
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
Ef
fects Processor
44.1kHz
Digital Mixing Desk
48.0kHz