O p e rat i o n – MUTEC MC-4 User Manual

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O P E RAT I O N

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Manual SDs-01 E 3.2.2003 18:26 Uhr Seite 12

X-SRC

BI-DIR

UNI-DIR

ADAT

SMUX4

SRC

This setting e.g. allows for unidirectional format conversion (see »MODE«,
»UNI-DIR«) of an ADAT

source signal with up to 50.0kHz sampling rate

(see »AUDIO

«, »ADAT«) simultaneously to all available output formats.

The sampling rate of the source signal will be displayed in the first LED row,
marked with »1«, of the »CLOCK

« menu. The ADAT

signal will be re-clo-

cked and transfered to both optical ADAT

outputs. Thus, the original input

signal is not lost and available for two times for further use!

Under »REFERENCE« the »ADAT« option is selected automatically. Please
see the passage below »Why a Clock Reference for unidirectional ADAT

Conversion without SRC?« for more information on that.

Within the »AUDIO

« menu, you can select with the »SELECT« button the

other available digital audio inputs. The reference for the selected audio
format will be activated accordingly.

Why a Clock Reference for unidirectional ADAT

Conversion without SRC?

To allow for ADAT

format conversion without SRC into AES3 and S/P-DIF,

the MC-4 needs to derive a valid clock signal from the incoming ADAT

au-

dio source. Therefore, the corresponding reference option is activated in the
»REFERENCE« menu automatically. This selection can not be changed.

Converting 2-Channel Signals only

If an AES3 or S/P-DIF 2-channel stereo signal is input for format conversion
only (without SRC option), it is imperative to select under »REFERENCE« the
corresponding input number »IN1– IN4« as converting reference!

The sampling rate of the incoming AES3 or S/P-DIF signal will be displayed
in the »CLOCK

« menu.

Converting multichannel AES3 or S/P-DIF Signals

When format converting multiple AES3 or S/P-DIF stereo signals to ADAT

without using the SRC option, you must ensure that the individual stereo
input signals are all of equal and sychnronized sampling rates!

Further Setting Examples

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

AES3

AUDIO

S/P-DIF

AES11

WCLK

Channel Assignment

The equal channel number assign-
ment of the multichannel audio

streams is guaranteed in all operations
modes of the MC-4.

Unidirectional Format Conversions

X-SRC

BI-DIR

UNI-DIR

ADAT

SMUX4

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

AES3

AUDIO

S/P-DIF

AES11

WCLK

Unidirectional format conversion from ADAT

SMUX4 to AES3, S/P-DIF coaxial, ADAT

SMUX4.

X-SRC

BI-DIR

UNI-DIR

ADAT

SMUX4

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

AES3

AUDIO

S/P-DIF

AES11

WCLK

Unidirectional format conversion from S/P-DIF coaxial to AES3, ADAT

. Here, a two channel

S/P-DIF signal only is applied at S/P-DIF input »1«, thus under »REFERENCE« the corresponding
clock reference »IN 1« is selected.
This is the only mode, in which the S/P-DIF interfaces work as inputs!

ADAT

/ SMUX Adaption

When AES3 or S/P-DIF signals with
sampling rates up to 50.0kHz coming

in, both optical outputs transmit the same
ADAT

signal and function as signal splitter.

Incoming AES3 or S/P-DIF signals with
50.0kHz to 100.0kHz sampling rates let the
optical output format switch to SMUX2.

Sampling rates of 100.0kHz to 200.0kHz of in-
coming AES3 or S/P-DIF signals let the optical
output format switch to SMUX4.

The corresponding SMUX format of the opti-
cal outputs is displayed under »STATUS«.

SMUX2 + SMUX4

The 8 channel ADAT

format uses standard-

ly one optical connector and is limited to
sampling rates up to 50.0kHz. To enable the
use of higher sampling rates up to 192.0kHz,
SMUX2 or SMUX4 processing must be acti-
vated separately because these formats are
not decoded in the ADAT

data stream for

automatic detection.

The SMUX2 process splits the ADAT

stream

into two 4-channel blocks. Thus, both optical
inputs »A« and »B« must be used to input a
full 8-channel ADAT

stream, whereas input

»A« receives channel 1– 4 and input »B« re-
ceives channel 5 – 8. SMUX2 transmits ADAT
streams with clock rates between 50.0kHz
and 100.0kHz.

SMUX4 works equally to SMUX2. Due to the
higher sampling rates, only 4 channels of an
8-channel ADAT

stream can be processed.

Thus, the optical input »A« receives channel
1 + 2 and input »B« receives channel 3 + 4.
Channels 5 – 8 can no more processed with
SMUX4, which transmits ADAT

streams with

sampling rates from 100.0kHz to 200.0kHz.