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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
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"Origin" Mode
In this mode, distributed systems are used to monitor the quality. A call may be
initiated from line X of one OPERA™ system to another OPERA™ system. As
soon as the call has been established, a speech sample is transmitted from the
far end to line X of the near end. Simultaneously all incoming signals on line X
are recorded to a file. Line X may be any of the available interfaces of the
system initiating the call. The calling OPERA™ system must not necessarily be
the local system. Both systems involved in the measurement may be remote
systems. The calling as well as the receiving process may run on the same
(remote or local) system as well. This operation mode is called the "Origin"
mode.
shows the OptiCall™ window after Origin had been selected. The
Figure 4.17
operation is the same as in the loop mode, except for the missing selection of
the interface that terminates the call. When using the Origin mode, no speech
file will be send, just the recording is active.
Figure 4.17:
The OptiCall ™window in Origin mode
"Termination" Mode
In the termination mode a call from another OPERA™ system is expected on on
one specific interface X. As soon as the call has been established, the reference
file will be played through the selected interface and simultaneously all
incoming signals on interface X are recorded to a file. Interface X may be any of
the available interfaces of the system expecting the call. The OPERA™ system
waiting for the call must not necessarily be the local system. Both systems
involved in the measurement may be remote systems. The calling as well as the
receiving process may run on the same (remote) system as well.
T O
K N O W
T H E
O P E R A ™
Data recorded at the originating side
(degraded speech signal)
Data recorded at the terminating side (Echo
signal)
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