Manual

Chapter 9 - RB-SP1 Digital Splitter & Combiner
Redbox User Handbook 9-3
9.3.2. Type & Mode Switches
The Type and Mode switches are on the front panel – see Fig 5-3. The Type switch
sets the unit into either the Split 96 or Stereo/Mono style of operation. The Mode
switch sets the unit into Split, Bypass or Combine mode.
See Figure 5-4 for diagrammatic explanations of the different types and modes
available.
Split 96 – This is a method that allows older equipment to handle 48kHz double
sampled (96kHz) digital signals. To do this, Split 96 uses two digital signals running at
48kHz, where both sub-frames of a single 48kHz stream are used to carry information
about a mono signal, with the resultant signal of both 48kHz streams being equivalent
to a stereo 96kHz signal. The unit will also perform the same function for 88.2kHz
stereo and 44.1kHz double sampled signals.
• In Split Mode a single stereo 96kHz signal is received into input 1 which is then
output as two separate 48kHz signals. Output 1 will contain just left channel data
and output 2 will contain just right channel data. If the signal from the input
disappears then both
Outputs will be muted.
• In Combine Mode two 48kHz double sampled input signals are combined to
create a single 96kHz signal on output one. If either input 1 or 2 are lost then the
output will be muted. In this mode output 2 will always be muted.
Stereo/Mono – This allows a digital stereo signal to be separated into two mono
digital signals and vice-versa.
• In Split Mode a single stereo digital signal is routed to two digital outputs.
Output 1 will contain the original left channel data on its left output and a muted
signal on its right output. Output 2 will contain the original right data on its left
output and a muted signal on its right output. This mode can be altered by the
dipswitch settings, to a channel swap mode or a dual mono mode. These are
described in more detail in the Rear Panel Controls section below.
• In Combine Mode two mono signals are combined to create a single stereo
signal. Output 1 will contain the input 1 left channel data on its left channel and
input 2 left channel data on its right channel. This mode can be altered by a
dipswitch setting, as with the split mode. Where either the left or right channel
data of input 2 is output on the right channel data of the output. If the two
signals are of different sample rates, a sample rate converter can be switched in
place to convert the sample rate of input channel 2 to that of input channel 1. In
the Stereo/Mono Combine mode, output 2 is always muted.
Bypass Mode – In Bypass mode, input 1 is routed to output 1 and input 2 is routed
to output 2. Input 1 is used as the master clock input. If input 2 is at a different
sample rate to input 1 then input 2 is sample rate converted to match input 1. If the
signal from input 2 is lost then output 2 will be muted. However, if the signal from
input 1 is lost then both outputs will be muted and will only return once a signal is
present on input 1.
Note that when the unit is operating in Bypass Mode the Type switch is ignored.