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C H A P T E R
4 :
G E T T I N G
F R A M E W O R K
Note:
By using OptiCall – Telephony Standard View, it is always the
terminating side of a call that is talking. This is also true when using
the audio interfaces. When it is necessary for the other party to
speak , then use the Expert View
Next choose the interface which originates the call and the interface which is
terminating the call. Click with the mouse on the drop down list boxes for
Origin
and
Termination
Each entry in this list box starts with an index. This index is the line number,
which is used to uniquely identify on which interface each file was recorded.
Following is a short text that describes the type of interface. Names starting with
POTS
refer to the analog loop start interfaces. Names starting with
identify the audio interfaces. The list of available devices may depend on which
hardware is installed on this OPERA™ system. The list always shows the
interfaces available on the machine that was selected as the
Figure 4.16: Selection of interfaces
If in our example choose "1: POTS Line #0" as the Origin and "1: POTS Line
#1" as the Termination, the resulting file names will be:
c:\temp\demo—line0.wav
c:\temp\demo—line1.wav
If "4: Audio 1 Analog" as the Origin and "6: Audio 2 Analog" as the
Termination were chosen instead, the resulting file names would be:
T O
K N O W
. The options shown may look similar to Figure 4.16.
Data recorded at the originating side
(degraded speech signal)
Data recorded at the terminating side (Echo
signal)
46
T H E
O P E R A ™
Network Node
Audio
.
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