Shift in Speech Quality and Acceptability Level between 2008-2012

Shift in Speech Quality and Acceptability Level between 2008-2012

Pavel Souček (Department of Measurement, Faculty of Electronical Engineering, Czech Techical University in Prague, Prague, Czech Republic) and Jan Holub (Department of Measurement, Faculty of Electronical Engineering, Czech Techical University in Prague, Prague, Czech Republic)
DOI: 10.4018/jitn.2013070107
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Abstract

This paper presents results of quality and acceptability level tests, performed on similar groups of listeners with two years span in years 2008, 2010 and 2012. It shows shift in both quality and acceptability level and compares them. The tests were conducted according to P.800.
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Experiment Description

Database used for tests consisted of total of 128 samples, divided into 32 conditions using 4 coders: GSM, G.729 (ITU-T G.729), TETRA and MELPe (Street & Collura, 2001) in 16 combinations. The coders were selected in way, that they reflect real life conditions and to cover whole MOS scale evenly. The coder combinations we used are listed in Table 1.

Table 1.
Coder combinations
ConditionCoders combination
1TETRA
2MELPe
3TETRA-MELPe
4MELPe-TETRA
5TETRA-GSM
6GSM-TETRA
7TETRA-G729
8G729-TETRA
9MELPe-G729-TETRA
10TETRA-G729-MELPe
11GSM
12G729
13MELPe-G729
14MELPe-GSM
15G729-MELPe
16GSM-MELPe

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