Clicky

Introduction
Functionality
Scientific Background
AQuA Command Line parameters
AQuA Command Line usage
Analysis of possible reasons for voice and audio quality loss
Visualizing signals spectrum for analysis
AQuA Online
AQuA Benefits

AQuA – Audio Quality Analyzer page
Download AQuA Manual as PDF

Visualizing signals spectrum for analysis

AQuA 5.x has a special parameter to store pairs of spectrum energy in critical bands of original and degraded audio to a .csv file:

aqua-wb tst.lic -mode files -src file male.wav -tstf male_5s_delay_5s_end.wav -npnt auto -miter 1 -ratem %pm -fau report.txt -tmc on -gch -psyn off -psyf off -smtnrm on -enorm on -grad on -specp 32 spect.csv

This command produces the following output:

Sevana Audio Quality Analyzer – AQuA-Wideband v.5.3.11.712.
Copyright (c) 2009 by Sevana Oy, Finland. All rights reserved.
—————————————————————
File Quality is
Percent value 91.37
MOS value 4.86
PESQ value 3.30
Calculating time 1.407000 sec.Press any key to continue….

File spect.csv contains 32 pairs related to spectrum energies of both files, so after importing the file into electronic spreadsheet we can plot a diagram visualizing differences in signals’ spectrum:

As one can see there difference is not big and the reasons for received MOS score are stored in report.txt:

Source SNR : 73.214584.
Degradated SNR : 73.277180.
Duration distortion.
Audio stretching corresponds to 9.81 percent.

Delay of audio signal activity.
Signal delayed by 4990.000000 ms.

Audio signal activity mistiming (unsynchronization) is 1.14 percent.

As one can the main reasons are mistiming and delay, which we have not removed, and if we remove it as described in previous chapter:

aqua-wb tst.lic -mode files -src file male.wav -tstf male_5s_delay_5s_end.wav -npnt auto -miter 1 -ratem %pm -fau report.txt -tmc on -gch -psyn off -psyf off -smtnrm on -enorm on -grad on -trim r 5 -specp 32 spect.csv

we receive result showing that the files are of identical quality:

Sevana Audio Quality Analyzer – AQuA-Wideband v.5.3.11.712.
Copyright (c) 2009 by Sevana Oy, Finland. All rights reserved.
—————————————————————
File Quality is
Percent value 99.94
MOS value 5.00
PESQ value 4.49
Calculating time 1.406000 sec.

To AQuA Manual Page (5/7)

To AQuA Manual Page (7/7)

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