Predicting the Quality of Synthesized and Natural Speech Impaired by Packet Loss and Coding Using PESQ and P.563 Models

This paper investigates the impact of independent and dependent losses and coding on speech quality predictions provided by PESQ (also known as ITU-T P.862) and P.563 models, when both naturally-produced and synthesized speech are used. Two synthesized speech samples generated with two different Text-to-Speech systems and one naturally-produced sample are investigated. In addition, we assess the variability of PESQ’s and P.563’s predictions with respect to the type of speech used (naturally-produced or synthesized) and loss conditions as well as their accuracy, by comparing the predictions with subjective assessments. The results show that there is no difference between the impact of packet loss on naturally-produced speech and synthesized speech. On the other hand, the impact of coding is different for the two types of stimuli. In addition, synthesized speech seems to be insensitive to degradations provided by most of the codecs investigated here. The reasons for those findings are particularly discussed. Finally, it is concluded that both models are capable of predicting the quality of transmitted synthesized speech under the investigated conditions to a certain degree. As expected, PESQ achieves the best performance over almost all of the investigated conditions

Impact of Different Active-Speech-Ratios on PESQ’s Predictions in Simulated VoIP Environment

In this work, we experimentally study how behaviour of the PESQ predictions varies with reference signal characteristic. In particular we investigate the impact of different Active-Speech-Ratios on speech quality prediction in simulated VoIP environment from objective and subjective testing point of view. 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-Ratio and network conditions, as well as their accuracy, by comparing the predictions with subjective assessments

Systême silurien du centre de la Bohême /

Accompanied by "Suite éditée aux frais du Barrande fonds. Problematica silurica. Publiés par le Prof. Dr. Anton Fritsch. Avec 12 planches. Traduit par A. S. Oudin, ... " (28 p. illus., 12 pl. 33 cm.) Published: Prague, Leipzig, R. Gerhard, 1908.Each plate accompanied by leaf with descriptive letter-press.Vol. 4, 7-8: Continuation éditée par le Musée bohéme. Prague, F. R̆ivnáĕ; Leipsic, R. Gerhard.vol. 7. [t. 1er.] Classe des echinoderms. Ordre des cystidées. Publié par le doct. W. Waagen. 1887. svii, [2], 233 p. 39 pl. [t. 2e.] Classe des echinoderms [suite]. Famille des crinoïdes. Par le prof. doct. W. Waagen et le doct. J. Jahn. Traduit par A. S. Oudin. 1899. v, 251 p. pl. 40-79.--vol. 8. tome 1er. Bryozoaires, hydorzoaires et partie des anthozoaires par le doct. Phillipe Počta. 1894. ix, [2], 230 p. 19 (i.e. 21) pl. t. 2e. Anthozoaires et alcyonaires par le doct. Phillipe Počta. Traduit par A. S. Oudin. 1902. viii, 347 p. pl.20-118.vol. 1. Crustacés: Trilobites. 1852. 2 vol. 51 pl. (incl. 2 diagr.) Supplément. Trilobites, crustacés divers et poissons. 1872. 2 vol. 35 pl.--vol. 2. Classe des mollusques. Ordre der céphalopodes. 1865-1877. 9 vol. 460 (i.e. 461) pl. Supplément et série tardive. 1877. 2 vol. pl. 461-544.--vol. 3. Classe des mollusques. Ordre des ptéropodes. 1867. xv, 179 p. 16 pl.--vol. 4. Gastéropodes par le doc. Jaroslav Perner. Traduit par A. S. Oudin. 1903-1911. 3 vol. 247 pl.--vol. 5. Classe des mollusques. Ordre des brachiopodes. 1879. 2 vol. 153 pl.--vol. 6. Classe des mollusques. Ordre des acéphalés. 1881. 4 vol. 361 pl.--Mode of access: Internet