Impact of Different Active-Speech-Ratios on PESQ’s Predictions in Case of Independent and Dependent Losses (in Presence of Receiver-Side Comfort-Noise)
Autor
Počta, P.
Holub, J.
Vlčková, H.
Polková, Z.
Metadata
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This paper deals with the investigation of
PESQ’s behavior under independent and dependent loss
conditions from an Active-Speech-Ratio perspective in
presence of receiver-side comfort-noise. This reference
signal characteristic is defined very broadly by ITU-T
Recommendation P.862.3. That is the reason to investigate
an impact of this characteristic on speech quality prediction
more in-depth. We assess the variability of PESQ’s
predictions with respect to Active-Speech-Ratios and loss
conditions, as well as their accuracy, by comparing the
predictions with subjective assessments. Our results show
that an increase in amount of speech in the reference signal
(expressed by the Active-Speech-Ratio characteristic)
may result in an increase of the reference signal sensitivity
to packet loss change. Interestingly, we have found two
additional effects in this investigated case. The use of
higher Active-Speech-Ratios may lead to negative shifting
effect in MOS domain and also PESQ’s predictions accuracy
declining. Predictions accuracy could be improved by
higher packet losses.
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