Focusrite OctoPre Digital Option Manual de usuario

Digital

Option

OctoPre Digital Option Operation Guide

Overview

The OctoPre digital interface card contains 8 separate

analogue to digital converters allowing all 8 OctoPre

channels to be accessed simultaneously on the rear panel

as either analogue or digital signals. The interface card is

available in two feature options: -

1. AES/SPDIF/ADAT™

The 8 channels of the OctoPre are converted

simultaneously to either AES or SPDIF standard and to

ADAT™ standard.

2. ADAT™

The 8 channels of the OctoPre are converted only to

ADAT™ standard.

These instructions refer to both feature options. Note:

Where the instructions refer to features that are only

available on the “AES/SPDIF/ADAT™” version these will

be marked with an “*”.

Digital Outputs

*AES

The 8 channels of OctoPre audio in AES digital format are

made accessible by connecting the AES cable to the 9 pin

D-type connector and switching “out” the AES/SPDIF

switch on the rear panel. The AES cable has four colour

coded XLR type connectors, each carries a pair of digital

audio channels as follows: -

OctoPre Channel

Number (Analogue

Output)

AES/SPDIF Connector Ring

Colour

Channel label in

digital stream.

BLACK

RED

YELLOW

BLUE

*SPDIF

The 8 channels of OctoPre audio in SPDIF digital format

are made accessible by connecting the SPDIF cable to the 9

pin D-type connector and switching “In” the AES/SPDIF

switch on the rear panel. The SPDIF cable has four colour

coded Phono/RCA type connectors and pairs of digital

audio are sent down each cable, see above for colour to

channel identification.

ADAT™

The 8 channels of OctoPre audio in ADAT™ format are

made accessible via two light pipe sockets. The function of

these connectors is dependent upon the sample rate set

for digital conversion on the front panel. At either

44.1KHz or 48KHz sample rates both sockets transmit all

8 channels of digital audio simultaneously giving two

identical parallel outputs of all 8 channels. At either

88.2KHz or 96KHz sample rates the digital outputs are

spread across the two connectors as follows: -

Audio transmitted in digital stream

OctoPre Channel

Number (Analogue

Output)

Sample Frequency

44.1KHz or 48KHz

Sample Frequency

88.2KHz or 96KHz

1 (1-4 connector)

2 (1-4 connector)

3 (1-4 connector)

4 (1-4 connector)

1 (5-8 connector)

2 (5-8 connector)

3 (5-8 connector)

4 (5-8 connector)

Note: The operation of splitting the 8 channels of

88.2/96KHz digital audio across two light pipe sockets

conforms to the S/MUX2standard. This standard is

required for the ADAT™ connectors to transmit at

88.2/96KHz because of a limitation in the transmission

speed of the original ADAT™ standard. The S/MUX2

standard of operation can only be used when connecting

to equipment capable of receiving audio data conforming

to this standard, check your equipment operating

instructions for compatibility.

S/MUX2is the copyright of Sonorus Inc, Newburgh, NY, USA

ADAT™ is the trademark of Alesis Corp

Rear Panel Controls

EXT SYNC Switch

Pressing “In” the EXT SYNC switch forces the 8 OctoPre

analogue to digital converters to synchronise to the clock

signal connected to the rear panel BNC style connector.

Note: When using an external clock source always select

the front panel frequency switch to match the sample rate

of the incoming signal. Without this the unit cannot lock to

the external clock signal.

*AES/SPDIF Switch

When the switch is in the “In” position the digital signals

present at the 9 pin D Type connector conform to the

“Professional” AES digital format standard. When the

switch is in the “Out” position the digital signals present at

the 9 pin D Type connector conform to the “Consumer”

SPDIF digital format standard.

Front Panel Controls

When the digital interface card is fitted into the OctoPre,

the Frequency Select and Dither switches and indicators

become active.

Frequency Select

Pressing the SELECT switch increments the converter

sample frequency from 44.1KHz through to 96KHz, when

either 88.2KHz and 96KHz is selected the operation of the

ADAT™ sockets automatically switch to the S/MUX2

operation.

Dither

Pressing the DITHER switch selects the digital output

word length to either 24, 20 or 16 bit, this is achieved by

dithering the converted signal and truncating the unused

bits.

Lock Indicator

The lock indicator is lit when the rear panel EXT SYNC

switch is pressed in and the unit is synchronised to the

incoming signal connected to the BNC connector.

Note: In case of discontinuity in the external clock

connection or extreme variation in external clock

frequency the OctoPre Lock indicator may switch off

indicating the unit has lost lock. To recover lock in this

situation, re-select the correct sample frequency from the

OctoPre front panel.

Audio Operation

The signal which is converted to digital is taken just before

the analogue output where 0dBfs (the maximum level

before digital overload) is equivalent to a 21dBu level at

the analogue output. The maximum analogue level can be

prevented from exceeding 0dBFs by using the channel

dynamics controls - see the OctoPre user guide for full

instructions.

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