Bibliographies thématiques / Acoustic regularities

Littérature scientifique sur le sujet « Acoustic regularities »

Auteur : Grafiati
Publié le 11 mars 2023

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Articles de revues sur le sujet "Acoustic regularities"

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Bondarenko, Veronika, et Alexander Chukarin. « GENERATION REGULARITIES OF VIBRATION AND NOISE SPECTRA OF THE GEARBOXES OF OVERHEAD TRAVELING CRANES ». Akustika 32 (1 mars 2019) : 120–22. http://dx.doi.org/10.36336/akustika201932120.

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The acoustic system of the overhead traveling cranes includes the following diverse sources of acoustical radiation: rails, wheel sets, a base frame, gears and motors of the lifting and moving mechanisms. The acoustic characteristics of the motors do not exceed the maximum permissible sound pressure levels. The gearboxes as the sources of noise and vibration are the most complicated units; moreover, they arrive at the manufacturing factories already being assembled. Therefore, when assessing the sound pressure levels of the cranes in whole, it is advisable to use the experimental data of the noise and gearbox vibration spectra.
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de Boer, Bart. « Evolution and self-organisation in vowel systems ». Phonetics of the Origins and Evolution of Speech 3, no 1 (31 décembre 1999) : 79–103. http://dx.doi.org/10.1075/eoc.3.1.06boe.

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This paper describes computer simulations that investigate the role of self-organisation in explaining the universals of human vowel systems. It has been observed that human vowel systems show remarkable regularities, and that these regularities optimise acoustic distinctiveness and are therefore adaptive for good communication. Traditionally, universals have been explained as the result of innate properties of the human language faculty, and therefore need an evolutionary explanation. In this paper it is argued that the regularities emerge as the result of self-organisation in a population and therefore need not be the result of biological evolution. The hypothesis is investigated with two different computer simulations that are based on a population of agents that try to imitate each other as well as possible. Each agent can produce and perceive vowels in a human-like way and stores vowels as articulatory and acoustic prototypes. The aim of the agents is to imitate each other as well as possible. It will be shown that successful repertoires of vowels emerge that show the same regularities as human vowel systems.
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Ryabov, V. A. « Hydroacoustical regularities of food behavior of dolphins ». Marine Biological Journal 3, no 2 (29 juin 2018) : 81–97. http://dx.doi.org/10.21072/mbj.2018.03.2.07.

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Hydroacoustic regularities of food behavior of dolphins are determined by characteristics and functionality of their acoustic signals. All the acoustic signals of dolphins are classified depending on their physical characteristics by the theory of signals and echolocation as follows: sequences of ultrashort ultrawideband coherent pulses – ‘clicks’, frequency-modulated (FM) simultones with uniformly distributed tones – ‘whistles’, packets of mutually coherent pulses (CI), packets of mutually noncoherent pulses (NI) and packets of versatile pulses (VI). They play the role of probing signals of six dolphin sonars optimized for solving various echolocation tasks. The possibilities of using the signals by dolphins in searching and classifying food objects by echolocation have been studied in this work on the basis of both experimental data obtained by the researcher and those available in literature. The dolphins can use sequences of ‘clicks’ to detect food objects (individual fish at the distance up to 70–110 m, a school of fish at the distance up to 450–600 m) and conspecifics (dolphins) (at the distance up to 450–600 m) and to classify food objects. The dolphins can use ‘whistles’ to detect food objects (individual fish at the distance up to 2 km, a school of fish at the distance up to 9–13 km) and conspecifics (dolphins) (at the distance up to 9–13 km) and to determine their range and relative radial velocity. ‘Whistles’ provide higher accuracy and the range of echolocation of food objects and conspecifics compared to ‘clicks’ (by more than an order of magnitude). Furthermore, the FM sonar provides the measure of the radial velocity of approaching or distance removing of underwater object to or from a dolphin. However, an acute analysis of the amplitude-time regularities of the fish echo for the purpose of their classification is the advantage of sonar using ‘clicks’. The dolphins can use the packs of CI at the distances shorter than 2.5 m for tracing the position dynamics of the prey aiming at accurate capture. The high hearing resolution of the dolphin in time is about 0.02 ms; it allows processing the subtle temporal dynamics of the echoes. Packs of NI (signals of spoken language) can be used by dolphins to organize various types of association and complex cooperation between themselves when hunting and catching fish. Packets of VI can be used by dolphins to expand the echolocation of the survey area around the dolphin in order to improve the quality of food objects monitoring, regardless of the position of the dolphin’s head, as well as to determine the range, relative radial velocity and class of food objects, at short distances. Evolution and perfection of various types of acoustic signals, sonars and various methods of processing echo signals in dolphins is caused, first of all, by optimization of hydroacoustic regularities of their food behavior, along with the need for orientation in three-dimensional space. One can assume the presence of similar hydroacoustic regularities of food behavior in Odontoceti based on the similarity of their acoustic signals and morphology. The acoustic regularities of food behavior of dolphins and bats are similar, despite the fact that they have different habitats (water and terrestrial-air), and these mammals belong to different orders of the animal kingdom (Сetacea and Chiroptera).
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Filonenko, Sergey, et Aleksandr Kosmach. « ACOUSTIC EMISSION IN THE FRICTION OF COMPOSITE MATERIALS ». Aviation 18, no 2 (2 juillet 2014) : 57–63. http://dx.doi.org/10.3846/16487788.2014.926640.

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The model of acoustic emission signal formation during friction and wearing of surfaces of composite materials was examined. The forms of acoustic emission resultant signals were shown. The regularities of parameter change in acoustic emission resultant signals with an increasing rotation speed were determined according to the results of modeling. It was found that theoretical and experimental results of acoustic emission signals registered during friction of composite material surface layers agree well.
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Besle, Julien, Zahra Hussain, Marie-Hélène Giard et Olivier Bertrand. « The Representation of Audiovisual Regularities in the Human Brain ». Journal of Cognitive Neuroscience 25, no 3 (mars 2013) : 365–73. http://dx.doi.org/10.1162/jocn_a_00334.

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Neural representation of auditory regularities can be probed using the MMN, a component of ERPs generated in the auditory cortex by any violation of that regularity. Although several studies have shown that visual information can influence or even trigger an MMN by altering an acoustic regularity, it is not known whether audiovisual regularities are encoded in the auditory representation supporting MMN generation. We compared the MMNs elicited by the auditory violation of (a) an auditory regularity (a succession of identical standard sounds), (b) an audiovisual regularity (a succession of identical audiovisual stimuli), and (c) an auditory regularity accompanied by variable visual stimuli. In all three conditions, the physical difference between the standard and the deviant sound was identical. We found that the MMN triggered by the same auditory deviance was larger for audiovisual regularities than for auditory-only regularities or for auditory regularities paired with variable visual stimuli, suggesting that the visual regularity influenced the representation of the auditory regularity. This result provides evidence for the encoding of audiovisual regularities in the human brain.
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Bekher, S. « Regularities of Acoustic Emission in the Freight Car Solebar Materials ». Journal of Physics : Conference Series 671 (18 janvier 2016) : 012005. http://dx.doi.org/10.1088/1742-6596/671/1/012005.

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Shkuratnik, V. L., Yu L. Filimonov et S. V. Kuchurin. « Regularities of Acoustic Emission in Coal Samples under Triaxial Compression ». Journal of Mining Science 41, no 1 (janvier 2005) : 44–52. http://dx.doi.org/10.1007/s10913-005-0062-8.

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Vil’yaminov, S. V., A. S. Voznesensky, V. V. Nabatov et V. L. Shkuratnik. « Regularities and mechanisms of thermal acoustic emission in gypseous rocks ». Journal of Mining Science 45, no 6 (novembre 2009) : 533–40. http://dx.doi.org/10.1007/s10913-009-0067-9.

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Winkler, István, et Nelson Cowan. « From Sensory to Long-Term Memory ». Experimental Psychology 52, no 1 (janvier 2005) : 3–20. http://dx.doi.org/10.1027/1618-3169.52.1.3.

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Abstract. Everyday experience tells us that some types of auditory sensory information are retained for long periods of time. For example, we are able to recognize friends by their voice alone or identify the source of familiar noises even years after we last heard the sounds. It is thus somewhat surprising that the results of most studies of auditory sensory memory show that acoustic details, such as the pitch of a tone, fade from memory in ca. 10-15 s. One should, therefore, ask (1) what types of acoustic information can be retained for a longer term, (2) what circumstances allow or help the formation of durable memory records for acoustic details, and (3) how such memory records can be accessed. The present review discusses the results of experiments that used a model of auditory recognition, the auditory memory reactivation paradigm. Results obtained with this paradigm suggest that the brain stores features of individual sounds embedded within representations of acoustic regularities that have been detected for the sound patterns and sequences in which the sounds appeared. Thus, sounds closely linked with their auditory context are more likely to be remembered. The representations of acoustic regularities are automatically activated by matching sounds, enabling object recognition.
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Morozov, S. A., et A. N. Chukarin. « PILOT STUDIES OF PROCESS OF VIBROACOUSTIC DYNAMICS AT LOCAL HARDENING OF DETAILS A SHARIKO-ROD UPROCHNITEL ». Herald of Dagestan State Technical University. Technical Sciences 45, no 4 (27 juin 2019) : 52–58. http://dx.doi.org/10.21822/2073-6185-2018-45-4-52-58.

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Objectives The most important problem of modern mechanical engineering is increase in durability of products, their efficiency and competitiveness in the world market. The equipment for machining creates the increased noise levels in a working zone of operators. Now regularities of formation of acoustic characteristics are studied generally for metal-cutting and woodworking machines of various types. Formation of the sound field at shariko-rod hardening is studied insufficiently. The purpose of researches which results are given in this article consisted in studying of regularities of spectral structure of noise and vibrations when processing ShSU of details with various ways of fixing. Method. In the course of pilot studies the known methods of measurement and processing of experimental data in relation to acoustic and vibration characteristics were used. Results. It is established that noise ranges at ShSU of details with various ways of fixing have identical regularities of a shumoobrazovaniye and are characterized by pronounced high-frequency character. It is proved that the dominating sources yaa-lyatsya the strengthened detail and an uprochnitel. Conclusion. Sizes of excesses of levels of sound pressure systems "up-rochnitel-detal2 in a high-frequency part of a range 500-8000gts are installed. The established regularities of formation of spectral structure are a basis for the choice of means of decrease in noise levels. Work is performed within initiative research work.
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Thèses sur le sujet "Acoustic regularities"

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Glass, James Robert. « Finding acoustic regularities in speech : applications to phonetic recognition ». Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14777.

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Costa, Faidella Jordi. « Regularity encoding in the auditory brain as revealed by human evoked potentials ». Doctoral thesis, Universitat de Barcelona, 2011. http://hdl.handle.net/10803/78918.

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Acoustic regularity encoding has been associated with a decrease of the neural response to repeated stimulation underlying the representation of auditory objects in the brain. The present thesis encloses two studies that sought to assess the neural correlates of acoustic regularity encoding in the human auditory system, by means of analyzing auditory evoked potentials. Study I was conducted at the Cognitive Neuroscience Research Group, at the Faculty of Psychology of the University of Barcelona (Barcelona, Catalonia, Spain), under the direct supervision of Dr. Carles Escera. This study aimed to explore the dynamics of adaptation of the auditory evoked potentials to probabilistic stimuli embedded in a complex sequence of sounds. The main outcome of this study was the demonstration that the amplitude of auditory evoked potentials adapts to the complex history of stimulation with different time constants concurrently: it adapts faster to local and slower to global probabilities of stimulation. This study also showed that auditory evoked potential amplitudes correlate with stimulus expectancy as defined by a combination of local and global stimulus probabilities. Study II was conducted at the Institute of Child Health (ICH), at the University College of London (UCL; London, United Kingdom), under the direct supervision of Dr. Torsten Baldeweg. This study aimed to explore the influence of timing predictability in the neural adaptation to probabilistic stimuli. The main outcome of this study was the demonstration that timing predictability enhances the repetition-related modulation of the auditory evoked potentials amplitude, being essential for repetition effects at early stages of the auditory processing hierarchy.
La codificació de regularitats acústiques està associada amb la reducció de la resposta neuronal a l’estimulació repetida, essent la base de la representació dels objectes auditius al cervell. La present tesi doctoral inclou dos estudis que exploren els correlats neuronals de la codificació de regularitats acústiques al sistema auditiu humà, mitjançant l’anàlisi dels potencials evocats auditius. L’objectiu del primer estudi, realitzat al Grup de Recerca en Neurociència Cognitiva de la Facultat de Psicologia de la Universitat de Barcelona (UB) i sota la supervisió directa del Dr. Carles Escera, va ser el d’explorar les dinàmiques d’adaptació dels potencials evocats auditius a estímuls probabilístics en una complexa seqüència de sons. El resultat principal d’aquest estudi va ser la demostració de que l’amplitud dels potencials evocats auditius s’adapta a la historia complexa d’estimulació amb diferents constants temporals simultàniament: s’adapta més ràpidament a probabilitats d’estimulació locals que globals. Aquest estudi també va mostrar que l’amplitud dels potencials evocats auditius correlaciona amb l’expectància d’un estímul definida com a una combinació de probabilitats locals i globals d’estimulació. L’objectiu del segon estudi, realitzat al Institute of Child Health (ICH), de l’University College of London (UCL), sota la supervision directa del Dr. Torsten Baldeweg, va ser el d’explorar la influència de la predictabilitat temporal en l’adaptació de l’activitat neuronal a estímuls probabilístics. El resultat principal d’aquest estudi va ser la demostració que la predictabilitat temporal intensifica la modulació de l’amplitud dels potencials evocats auditius a la repetició dels estímuls, essent esencial pels efectes que la repetició exerceix en etapes primerenques de la jerarquía de processament auditiu.
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« Finding acoustic regularities in speech : applications to phonetic recognition ». Research Laboratory of Electronics, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/4956.

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James Robert Glass.
Also issued as Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1988.
Includes bibliographical references.
Supported by the National Sciences and Engineering Research Council of Canada and the Defense Advanced Research Projects Agency.
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Chapitres de livres sur le sujet "Acoustic regularities"

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Damaskinskaya, Ekaterina, Vladimir Hilarov, Ivan Panteleev, Dmitry Korost et Dmitry Frolov. « Statistical Regularities of a Main Crack Formation in Rocks. Acoustic Emission and X-Ray Computed Microtomography ». Dans Springer Proceedings in Earth and Environmental Sciences, 23–32. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31970-0_3.

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« Chapter 4 Basic regularities of acoustic emission at friction ». Dans Acoustic Emission in Friction, 135–82. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-8922(07)80024-1.

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Actes de conférences sur le sujet "Acoustic regularities"

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Kyaw, Phone Htet, Oleg Ye Sysoyev, Egor Aleksandrovich Kuznetsov et Boris Nikolaevich Marin. « Regularities of Changes in the Fractal Dimension of Acoustic Emission Signals in the Stages Close to the Destruction of Structural Materials When Exposed to Low-Cycle Loaded ». Dans the Asia-Pacific Conference on Intelligent Medical 2018 & International Conference on Transportation and Traffic Engineering 2018. New York, New York, USA : ACM Press, 2018. http://dx.doi.org/10.1145/3321619.3321685.

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Kiryanov, Alexey V., Evgeniya N. Salnikova, Boris A. Salnikov et Nikolai Yu Slesarev. « Modeling and study of main regularities of the formation of sound fields in randomly inhomogeneous underwater waveguides ». Dans 170th Meeting of the Acoustical Society of America. Acoustical Society of America, 2015. http://dx.doi.org/10.1121/2.0000126.

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Rapports d'organisations sur le sujet "Acoustic regularities"

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Glass, James R. Finding Acoustic Regularities in Speech : Applications to Phonetic Recognition. Fort Belvoir, VA : Defense Technical Information Center, décembre 1988. http://dx.doi.org/10.21236/ada207072.

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