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Redbox User Handbook No 1
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DIGITAL AUDIO CONVERTERS
5 RB-SP1 Digital Splitter & Combiner
Introduction
Fig 5-1: RB-SP1 Front Panel
The RB-SP1 Digital Splitter & Combiner is used to interface various double sampling pieces
of equipment. Some older equipment uses 2 AES/EBU connectors for double sampling with
each connector carrying an audio signal at a normal frame rate, whilst other equipment
has a single connector using twice the frame rate. The RB-SP1 can interface between them,
either combining the signals from 2 XLR’s into 1, or splitting the signal from 1 XLR into 2.
The RB-SP1 can also be used for interfacing stereo and mono signals to digital mixing desks
by splitting the left and right signals of a stereo XLR to two separate XLR’s, and vice versa by
combining them.
Additionally, a sample rate converter on the second digital input can be used to convert
the sample rate of the secondary input to that of the primary input. The RB-SP1 can handle
sample rates up to 96kHz and sample sizes of 16, 20 and 24 bit.
There are two types of operation : Split 96, and Stereo/Mono. These each have three
different switch modes : Split, Bypass and Combine.
Both inputs and outputs can be selected as either AES/EBU or S/PDIF with the resultant
digital level following the switch selection.
System Block Diagram
Fig 5-2: RB-SP1 System Block Diagram
Digital
Input
Select
Digital
Output
Select
Receiver
Combine & Bypass Mode Only
Split Bypass Mode Only
Receiver
& SRC
Router
Transmitter
Transmitter
Digital
Input 1
Digital
Input 2
Digital
Output 1
Digital
Output 2
