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6 :
T E L E P H O N Y
T E S T I N G
B A N D
V O I C E
Q U A L I T Y
6.8.2 Example 2: Measurements From a Batch File
For this example the batch file RunPSQM.bat contained in the installation
directory of your OPERA™ system is used. The proposed files for assessment in
this example are located in the same directory. The names of these files are
"PSQMRef.wav" and "PSQMTest.wav". The following lines show the contents
of RunPSQM.bat . Have a look at those lines and read the explanation that will
follow after the file excerpt.
@echo off
rem batch file to compute PSQM from two mono input files
rem
rem
Parameters:
rem
rem
RunPsqm
<File1> <File2> <Outputfile>
rem
rem
File1:
File that contains the reference signal
rem
rem
File2:
File that contains the test signal.
rem
rem
Outputfile: Results are stored in this file. If
rem
it already exists, results are
rem
appended to it, otherwise it will be
rem
newly created.
rem
rem
echo **************************************************
echo ***** RunPSQM
V2.0 (c) OPTICOM, 2000
***
echo **************************************************
echo.
pushd
echo *** TODO: change working dir according to where
echo
OPERA.exe is!
echo ... Processing file %1
Opera -Exec -Algorithm Name=PSQM -Input Inp=0 File=%1 Inp=1
File=%2 -Mux InpRefLeft=0 ChannelRefLeft=0 InpTestLeft=1
ChannelTestLeft=0 -Delay Channel=0 -Signal StaticGainOn
DCFilterOn -Out %3 -Append
popd
echo Done!
To run this batch file, please open an MS-DOS Command Prompt window.
Start the batch file by entering following syntax: "RunPQSM <File1>
<File2> <Outputfile>". This batch file has three parameters, the first one is
the filename and the path of the reference signal, e.g.
"C:\Programme\Opera\WaveFiles\PSQMRef.wav". The second parameter is the
test file, e.g. "C:\Programme\Opera\WaveFiles\PSQMTest.wav". Both of these
WAVE files are located in the WaveFiles subdirectory of the OPERA™
installation folder on the harddisk.
The third and last parameter is the path with the name of the output file that will
contain the result values, e.g. "C:\Temp\PSQMresult.txt".
In the next lines of the batch file OPERA™ is executed. Please note that the
parameters that follow the command "opera" must be written into one line.
Here, those lines had to be wrapped in the absence of space in this manual.
165
RunPSQM.bat