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C H A P T E R
4 :
G E T T I N G
T O
K N O W
T H E
O P E R A ™
F R A M E W O R K
and the test signal in the right channel of a file. Figure 4.29 shows a screen
dump of this wizard step.
Figure 4.29: Selection of Input 2
Measurement Setup Wizard Step 3, Mapping between physical inputs
and logical measurement signals.
OPERA™ has a
built-in multiplexer
that works like a crossbar switch matrix.
This multiplexer separates the physical input signals from the signals used as the
input signals of the measurement algorithm. This allows, for example, using
only one input file that contains the reference signal in one channel and the test
signal in the other channel. Also, in the case that the device under test is
swapping the channels, the multiplexer can be used to correct this. The chapter
on applications will show other useful example settings.
Figure 4.30 shows a screen shot of this wizard step. The dialog is organized
like a crossbar switch matrix. Each highlighted radio button indicates a
connection between one of the input signals and one of the measurement
signals. The example shown in Figure 4.30 represents a 1:1 relation between
the physical inputs and the logical measurement signals. This means that input
1/left is connected to reference/left, input 1/right to reference/right, input 2/left
to test/left and input 2/right to test/right.
If not all physical input channels are available, the according radio buttons are
disabled (e.g. if the input signals are mono, or input 2 is switched off).
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