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Tytuł:
Communication Platform for Evaluation of Transmitted Speech Quality
Autorzy:
Ciarkowski, A.
Czyżewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/307893.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
acoustic echo cancelation
doubletalk detection
echo hiding
Opis:
A voice communication system designed and implemented is described. The purpose of the presented platform was to enable a series of experiments related to the quality assessment of algorithms used in the coding and transmitting of speech. The system is equipped with tools for recording signals at each stage of processing, making it possible to subject them to subjective assessments by listening tests or, ob- jective evaluation employing PESQ or PSQM algorithms. The functionality for the simulation of distortions typical for voice communication over the Internet was implemented, making it possible to obtain reproducible, quantifiable results. An application of the presented platform for evaluation of acoustic echo canceler algorithm based on watermarking techniques, which was developed earlier is presented as an example of an effective deployment of the described technology.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 3; 95-101
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Echo ruin, Scherzo, Solo – Graficzny trójgłos o sztuce życia w trzech litografiach Cypriana Norwida z 1861 roku
Echo ruin (The Echo of Ruins), Scherzo, Solo – a graphic trilog on the art of life in Cyprian Norwid’s three lithographs of 1861
Autorzy:
Szymańska, Ilona
Powiązania:
https://bibliotekanauki.pl/articles/16729462.pdf
Data publikacji:
2020-05-05
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
Echo ruin
Scherzo
Solo
litografia
Norwid
The Echo of Ruins
lithograph
Opis:
The subject of the article is an attempt to look in a new way at three lithographs: The Echo of Ruins, Scherzo and Solo from 1861 as a result of Norwid's cooperation with the Paris workshop Saint-Aubin. Analysis of particular graphic works treated both as individual ones and as a three-part cycle, aims at finding the symbolic message contained in them. Interpretation of erudite compositions referring to both tradition and the sign space contemporary with the poet, in the context of Norwid's conception of art and the artist's views on its place in social life, allow noticing the wealth of their symbolic meaning, comprising at the same time a commentary of the phenomena contemporary with the poet and the dimension of universals.
Źródło:
Studia Norwidiana; 2012, 30; 39-77
0860-0562
Pojawia się w:
Studia Norwidiana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-destructive diagnostics of concrete cantilever beam and slab by impact echo method
Nieniszcząca diagnostyka konstrukcji betonowych belek wspornikowych i płyty stropowej za pomocą metody impact echo
Autorzy:
Rucka, M.
Wilde, K.
Powiązania:
https://bibliotekanauki.pl/articles/327542.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
diagnostyka ultradźwiękowa
metoda impact-echo
konstrukcja betonowa
ultrasonic testing
impact echo
concrete structures
Opis:
This paper focuses on the application of the impact-echo method for the full scale tests conducted on concrete bridge cantilever beams and a floor slab. The method uses the phenomenon of propagating waves induced by an impact and registered by one or two accelerometers. Experimental studies proved the applicability of the impact-echo method for damage detection in the considered concrete structural elements.
Praca poświęcona jest zastosowaniu fal sprężystych na przykładzie w metody impact-echo. Metoda ta wykorzystuje zjawisko propagacji fal wzbudzanych przez mechaniczne uderzenie i ich pomiar za pomocą jednego lub dwóch akcelerometrów. Przeprowadzone testy eksperymentalne dla betonowych wsporników oraz stropu potwierdziły skuteczność metody w wykrywaniu uszkodzeń.
Źródło:
Diagnostyka; 2010, 3(55); 63-68
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic experiment on diel fish behaviour cycle performed in the Gotland Deep
Autorzy:
Orlowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/332560.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
acoustic experiment
Gotland Deep
echo sounder
Opis:
This paper describes the results of 24 h acoustic experiment based on three-dimensional measurements of the S; distribution of herring and sprat in the southern Baltic in October 2001. The experiment was based on a continuous (24h day) integration offish echoes using an EY500 echo sounder from a vessel with a constant speed of 8 knots, moving along the sides of a square equal to 4 n.mi., localized inside the specified area. Duration of the experiment was limited by deterioration of the weather conditions but nearly 300 ESDU samples were collected. These are correlated with values of coincident environmental factors: time, depth, water temperature, salinity and oxygen levels; estimated on the basis of survey data. Fish behaviour vs environmental factors is described by different macrosounding visualizations, statistical, and mathematical models. The purpose of the paper is to compare results of the experiment to the average characteristics of fish behaviour in the same basin, based on autumn studies over the period 1995-2001. General analysis was provided for the selected area of the Polish EEZ (south Gotland Deep), characterized by the greatest depth movements of fish diel migration. The most significant differences were found between fish migration pattern and diel stability of the acoustic response between these situations, specially during the sunset period.
Źródło:
Hydroacoustics; 2003, 6; 19-30
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of in situ radiated noise of the platform used on shallow water area on echo sounder data in fisheries-acoustics
Autorzy:
Brehmer, P.
Guennegan, Y.
Arzelies, P.
Guillard, J.
Cheret, Y.
Duformentelle, P.
Colon, M.
Powiązania:
https://bibliotekanauki.pl/articles/332717.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
in situ
echo sounder
fisheries
acoustics
Opis:
The shallow water area of the coastal fringes is important to take into consideration in fish stock assessment because a great part of the stock, especially for the small pelagic fish is distributed in this area (20). In shallow water research vessels are prohibited to navigation (usually <20m) and usually only small boats can be used. One of the main source error in acoustics fish sampling is due to the avoidance reaction generated by the three dimensional noise diagram emitted by the boat. In this paper we highlighted the importance of wind direction and strength in the noise diagram emitted by the boat under in situ condition. A comparison of the noise level of two boats (a Research Vessel and a Speedboat equipped of similar echo sounder) has been made before simultaneous records of echo sounder data: the speedboat is more silent as revealed by in situ hydrophone measurement and near the ICES recommendations. The observation of shoal echo sounder descriptors shows an avoidance reaction as expected more important for the noisier boat: there the schools avoid more the research vessel. The avoidance reaction is characterised by a deeper position of the fish school barycentre, in the water column, detected by the research vessel and a shoal minimum depth higher than for the speedboat. The effect of noise diagram difference is clear on the same shoal descriptors, the difference appears for the vertical position of the barycentre and minimum altitude.
Źródło:
Hydroacoustics; 2003, 6; 31-40
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical properties of pulse-echo signal backscattered in trabecular bone
Autorzy:
Litniewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/331602.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
trabecular bone
pulse-echo signal
ultrasonic signal
Opis:
The paper considers the application of statistical properties of backscattered ultrasonic signal for assessment of the trabecular bone status. Computer simulations were conducted to investigate the properties of the ultrasound pulse-echo signal, as it is received on the transducer surface after scattering in trabecular bone. Results indicated that while for the well-defined trabeculae properties within the simulated bone structure the signal envelope values are Rayleigh distributed the significant departures from Rayleigh statistics may be expected as the thickness of trabeculae become random. The influence of the altering of mechanical properties of the bone tissue building the trabeculae on the signal statistical parameters was unnoticeable. The initial experiments confirming some cases of departure from Rayleigh statistics for envelopes of backscattered signals are also discussed.
Źródło:
Hydroacoustics; 2008, 11; 253-264
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O rytualnych pojedynkach artystów z systemem i ich dziennikach intymnych
Autorzy:
Grodecka, Aneta
Powiązania:
https://bibliotekanauki.pl/articles/1964831.pdf
Data publikacji:
2019
Wydawca:
Ośrodek Badawczy Facta Ficta
Tematy:
Waldemar Okoń
Jestem jak echo. Rok 1983
Recenzja
Źródło:
Facta Ficta. Journal of Theory, Narrative & Media; 2019, 4, 2; 117-124
2719-8278
Pojawia się w:
Facta Ficta. Journal of Theory, Narrative & Media
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 67

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