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Using the Echo
Algorithm
C H A P T E R
6 :
T E L E P H O N Y
T E S T I N G
At this time an echo measurement will be performed. Therefore the Echo
algorithm from the Menu Measurement|Algorithm Parameters ... is selected In
the Properties dialog choose 1000 ms is chosen as the maximum echo delay,
as shown in Figure 6.46. Click the OK button, close the Algorithm dialog
and take notice of the warning message and press Continue.
Figure 6.46: Algorithm Properties dialog for the Echo algorithm
After clicking on the Start toolbar button or selecting the menu option
Measurement|Start the Measurement Setup Wizard starts and the sent speech
sample file is chosen used during the OptiCall™ procedure as the first input
signal (see Figure 6.47), in this example "DefaultRefFile.wav". As the second
input signal the stored file is selected whose name ends with the string "Line1".
In this example the file "050700-Line1.wav" is selected (see Figure 6.48).
When clicking on the Next button the Signal Mapping Dialog will come up.
Here the left channel of Input 1 is assigned to the left channel of the Reference
Signal and the left channel of Input 2 to the left channel of the Test Signal.
Clicking on the Next button the Signal Preprocessing Dialog is reached where
the following settings are selected: Click on the Fixed Delay Radio Button and
leave the delay setting of 0 samples. In the field "Signal Conditioning" only the
Remove DC from Signals function is selected. No Static Delay of the Reference
Signal is entered. Figure 6.49 shows the settings proposed for this example.
B A N D
V O I C E
Q U A L I T Y
162
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