Focusrite OctoPre, Инструкция по эксплуатации

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ENGLISH
6
DIGITAL OUTPUT OPTIONS
In addition to the analogue outputs, the OctoPre can be fitted with one of two digital
output options. These are described below.
24-bit/96 kHz ADAT™ interface card
This card provides digital outputs for all eight OctoPre channels, which operate over
the full sample frequency range (44.1, 48, 88.2 and 96 kHz) and can be dithered to
16-, 20-, or 24-bit depths depending upon the destination. External word clock
synchronisation is possible using the rear panel BNC connector.
The card features two ADAT™-type ‘lightpipe’ output connectors. For speeds up to
48KHz both connectors transmit all 8 channels simultaneously. However, ADAT™-
type connectors are bandwidth limited at sample rates above 48 kHz - each audio
channel uses two ADAT™ digital channels to accommodate the increased quantity of
data, hence the need for two ADAT™ connectors to allow 8 channels of conversion at
high speed.
The ADAT™ output connectors operate as follows:
44.1/48Khz sample rates:
Connector 1 = channels 1 to 8 in parallel.
Connector 2 = channels 1 to 8 in parallel (identical to connector 1)
88.2/96Khz sample rates:
Connector 1 = channels 1 to 4.
Connector 2 = channels 5 to 8.
ADAT™ lightpipe cables are available from your local dealer, or in the UK from
Studiospares (tel +44 (0)20 7482 1692): stock number 585-510.
24-bit/96 kHz AES/SPDIF/ADAT™ interface card
This card contains exactly the same ADAT™-type digital output facilities as described
above, with the addition of AES and SPDIF format outputs via a 9-pin D-type
connector on the rear panel. As with the ADAT™-type outputs, the full range of
sample rates and bit depths are available, and the converter may be synchronised to an
external word clock source if required.
To access the digital signals from the 9-pin D-type AES/SPDIF output connector the
A/D card must be purchased with either an AES or SPDIF D-Type conversion cable
as follows: (Note: cables need to be purchased separately - since there are two different
cable options, (XLR for AES and RCA/phono for SPDIF) these are not included with
the A/D converter options.)
AES cable: 9-pin D-type to 4 male XLR connectors.
SPDIF cable: 9-pin D-type to 4 male RCA (phono) connectors.
Each connector routes two channels of digital audio – i.e. connector 1 routes channels
1 & 2, connector 2 routes channels 3 & 4, etc.
AES and SPDIF D-type conversion cables are available from your local Focusrite
dealer. Either 8 AES or 8 SPDIF outputs can be used simultaneously with 8 ADAT™
outputs and the OctoPre’s analogue outputs.
DIGITAL OUTPUT FRONT PANEL CONTROLS
CLOCK SELECT (non-latching switch)
This switch is used to select the digital output sample rate. Pressing the switch steps
through the four available sample rates: 44.1, 48, 88.2 and 96 kHz. The green LEDs
indicate the currently selected sample rate.