Manual

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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

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

X-SRC

= 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

= ADAT

up to 50.0kHz*

SMUX4

= ADAT

between 100.0kHz and 200.0kHz

SMUX2

= ADAT

between 50.0kHz and 100.0kHz*

AES3

= AES3 between 25.0kHz and 200.0kHz

AUDIO

S/PDIF

Continuous Clock Supply

When setting up your MC-4 for the

first time, you will recognize that

within the »REF CLOCK

« 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