MUTEC MC-4 - Manual (Page 15)

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Manual SDs-01 D 3.2.2003 17:45 Uhr Seite 3
OPERATING THE MC-4
MODE + AUDIO IN + REFERENCE Menus
These three function menus are offering access to the whole functionality
of your MC-4.
The »MODE« menu allows to select the general conversion option as uni- or
bidirectional conversion, with or without sampling rate conversion or the
X-SRC mode.
Within the »AUDIO IN « menu you select the digital audio formats for
conversion. This menu acts in dependency of the »MODE« menu. The
operating system makes sure that only useful combinations of conversion
modes and proper audio formats are accessable. Therefore both menus act
together in different combinations.
The »REFERENCE« menu provides all necessary synchronization options for
the corresponding conversions modes and the use of the internal sampling
rate converters (SRC). This menu also acts in dependency of the »MODE«
menu. It is only directly accessable when a SRC mode is selected under
»MODE«.
The menus »STATUS« and CLOCK IN « are for control of the MC-4‘s operation
status only. They are not accessable for adjustments.
General Operation Procedure
The MC-4 menu is strictly organized aligned to generally usual handling
procedures when inserting such a box into your studio‘s data stream. So,
you can split up all of the necessary adjustments in three steps, which leads
to the following three questions for the basic operation of your MC-4:
1) What kind of conversion should be executed → MODE?
2) Which digital audio format(s) should be involved as source(s) → AUDIO IN ?
* If both LEDs light in front of the ADAT TM and SMUX2 options, the S/P-DIF inputs function as audio
sources for conversion.
3) Which clock source do I need for my prefered operation → REFERENCE?
After these general decisions are made, your MC-4 is configured for optimal
operation in your set-up! Due to the fact that the system monitors for
useful function combinations, maloperation is not possible.
So, let‘s have a look to the individual functions on the next pages.
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
S/P-DIF
AES11
WCLK
15
X-SRC
12
= crosswise conversion between two formats and clock rates
BI-DIR = bidirectional conversion, between two formats only
UNI-DIR = unidirectional conversion, from one format to all others
SRC = above mentioned conversions with SRC
MODE
ADAT
1
= ADAT TM up to 50.0kHz*
SMUX4
1
= ADAT TM between 100.0kHz and 200.0kHz
SMUX2
1
= ADAT TM between 50.0kHz and 100.0kHz*
AES3
2
= AES3 between 25.0kHz and 200.0kHz
AUDIO IN
S/PDIF
Continuous Clock Supply
When setting up your MC-4 for the
first time, you will recognize that
within the »REF CLOCK IN « menu the LED at
»44.1«, under »1« lights constantly. This is
due to the MC-4‘s continuous clock supply
function.
When no input signal is available, the MC-4
supplies at all digital audio outputs blank
frame signals, the Word Clock output carries
a corresponding Word Clock reference
signal. Thus, connected devices receive
immediately valid clock signals at their ap-
propriate inputs after starting up the whole
studio set-up. The initial clock rate of all
outputs is 44.1kHz.
When loosing the external clock reference
signal during operation, the MC-4‘s PLL syn-
thesizer locks the internal reference clock
oscillator on the clock rate which is nearest
to the lost one to provide stable reference
signals to the connected devices.
!
REF CLOCK IN
88.2
48.0
44.1
32.0
192.0
96.0
176.4
1 2