Redbox RB-SC2
Dual Sample Rate Converter
Audio & Video Interfaces - Digital Audio Converters
RB-SC2 Dual Sample Rate Converter
Category: Digital Audio Converters.
Description: Dual Sample Rate Converter
(24 bit, 192kHz Capable).
Product Function: Transferring digital
audio between digital equipment.
Typical Applications: Converting an
audio library from 44.1kHz to 48kHz,
transferring digital audio from a recorder
at 48kHz to a digital mixer at 192kHz.
The RB-SC2 sample rate converter is a 1U
rack-mount which produces AES/EBU,
S/PDIF and TOSlink optical level digital
audio outputs from a balanced AES/EBU,
S/PDIF and TOSlink optical level digital
audio inputs. The sample rate of the
outputs can be set by an internal clock or
from various external synchroniser sources.
The RB-SC2 is a high performance, enhanced
version of the RB-SC1 providing the
following additional features:
• It supports higher sample frequency rates
up to and including 176.4kHz and 192kHz.
• It has 2 independent sample rate
converter circuits that use a common
clock source to set the output sample
• It has 2 optional video synchronising
boards. These set the output sample rate
to 48kHz that is synchronised to either an
analogue video signal or SDI digital video
signal (HD or SD).
• A special X-Lock mode allows the unit to
function as a full bi-directional sample
rate converter.
• It has TOSlink optical digital audio inputs
and outputs.
• It has front panel push-button switches
for all the main settings. The buttons
are arranged in sets, where pressing the
button advances the current selection
and LED indicator.
• A serial RS232 port is included so that
the RB-SC2 settings can be controlled
remotely. The front panel LED indicators
alter automatically when using RS232
For the digital outputs, there are three
push-button switches to select the sample
frequency (FREQUENCY), channel status
bit type (CSDATA), and sync source and
mode of operation (SYNC).
The FREQUENCY button allows selection
of the master sample frequency from
one of 32kHz, 44.1kHz, 48kHz, 88.2kHz,
96kHz, 176.4kHz or 192kHz. The CS DATA
button defines the content of the channel
status bits embedded within the digital
audio stream, and can be forced to either
Professional Mode (PRO), Consumer Mode
(CON) or to follow the mode of the input
The SYNC button is used to select the
synchronisation input, from the AES/EBU
sync input, the Wordclock input or, for
X-Lock, the other digital input. The X-Lock
synchronisation allows the unit to act as a
bi-directional sample rate converter with
the output of sample rate converter 1
syncing the input of sample rate converter
2 and vice versa so that they follow each
The application for the X-Lock mode is so
that the RB-SC2 can be inserted between
2 digital devices which run at different
sample rates, such as a PC recorder and a
digital player. Using the RB-SC2 in X-Lock
mode ensures that the 2 devices remain
synchronised at all times regardless of the
sample rate of the 2 devices.
The SYNC button will also select the
operating mode of the unit as described
below. If an optional video sync board is
fitted then 2 sync LEDs light together to
show the active video sync.
Master Mode - In this mode the unit
receives a digital audio signal, which
is passed to the sample rate converter
and then re-formatted for the digital
serial transmitter (IEC958). The sample
rate converter clock signal is generated
internally from an on board master clock at
a selectable rate (32kHz, 44.1kHz, 48kHz,
88.2kHz, 96kHz, 176.4kHz or 192kHz).
Slave Mode - In this mode the unit is
synchronised to an external source, using
the digital audio sync, or to the TTL level
Word Clock. The FREQUENCY LED will
indicate the synchronised sample frequency
and if no sync is present, no output will be
Auto Mode - Here, the unit is synchronised
to an external source, using the digital
Audio & Video Interfaces - Digital Audio Converters
RB-SC2 shown with optional synchronisation board.
audio sync, or to the TTL level Word Clock.
If no sync signal is present the unit runs
from the onboard master clock at a rate
selected by the front panel control (32kHz,
44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz
or 192kHz).
Specification For RB-SC2
Auto Lock Mode - This operates like the
auto mode except that if no sync signal
is present the unit will run at the closest
master clock rate to the last locked incoming
signal. The FREQUENCY LED will indicate the
synchronised sample frequency.
Dynamic Range:
When operating in sync modes, the SYNC
button flashes whenever the unit is not
synchronised to the incoming sync signal.
There are 2 further push-button switches
(INPUT 1 & INPUT2) that are used to select
the input connector used for each of the
2 sample rate converter circuits. These
switches select between AES/EBU, S/PDIF
and TOSLink optical connectors.
A red LED indicates power to the RB-SC2.
will accept a composite signal
of NTSC (525), PAL (625) & SECAM
(625) signals covered by
SMPTE-170-M (NTSC) and ITU-R
BT.470-6 (PAL & SECAM).
Audio Specification
138dB typical A-Weighted.
Distortion & Noise: -134dB THD + N at 1kHz, ref 0 dBFS
Sample Freq
32kHz – 196kHz
Input Sample
Up to and including 24 Bits.
Output Sample
24 Bits.
Digital Inputs:
2 x AES/EBU XLR 3 pin female
2 x S/PDIF RCA phono
2 x TOSLink optical input
Digital Outputs:
2 x AES/EBU XLR 3 pin plug
2 x S/PDIF RCA phono socket
2 x TOSLink optical output
Sync Inputs:
Video Sync
1 x AES/EBU XLR 3 pin female
1 x Word Clock BNC
1 x Video Input (optional)
The Digital video sync board will
accept 270Mbps SD-SDI and
HD-SDI signals covered by
SMPTE-259-M-C (SD) and
SMPTE-292M (HD).
The Analogue video sync board
Equipment Type
Dual Stereo Sample Rate Converter,
24 bit 192kHz
Physical Specifications
48cm (W) x 10.8cm (D*) x 4.2cm (H) (1U)
19” (W) x 4.3” (D*) x 1.7” (H) (1U)
59cm (W) x 27.5cm (D) x 11cm (H)
23.2” (W) x 10.8” (D) x 4.3” (H)
Consumer mode, professional
mode or follow input, via CS
DATA push-button
Nett: 1.4kg Gross: 2.0kg
Nett: 3.1lb Gross: 4.4lb
Digital Select:
AES/EBU, S/PDIF or TOSlink Input
optical, via INPUT1 or INPUT2
Analogue video sync board
Sync Input
AES/EBU, Word Clock, X-Lock or
Video, via SYNC push-button
Digital video sync board (SD-SDI
Sync Mode
Master, slave, auto or auto lock,
via SYNC push-button
1U Rear panel rack kit for large
Operational Controls
32, 44.1, 48, 88.2, 96,176.4 or 192kHz
via FREQUENCY push-button
Status Bits:
Other Connections
Mains Input:
Universal filtered IEC,
continuously rated 85-264VAC
@47- 63Hz, max 10W
Fuse Rating:
Anti-surge fuse 1A 20 x 5mm
Serial Port:
RS232 9 Pin D-type socket
Note that this product is deeper than standard Redboxes
61 Station Road, Irthlingborough,
Northants, NN9 5QE, UK
Tel: +44 (0) 1933 650700
Fax: +44 (0) 1933 650726
Email: sales@sonifex.co.uk
Unit 12/6 Leighton Place, Hornsby,
New South Wales 2077, Australia
Tel: +61 (2) 9987 0499
Fax: +61 (2) 9476 4950
Email: sales@innescorp.com.au
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