Relevant bibliographies by topics / Natural sources of sound

Academic literature on the topic 'Natural sources of sound'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Natural sources of sound"

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Ambaskar, Adwait, and Victor Sparrow. "Open source acoustic model development for natural and protected environments." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 4 (August 1, 2021): 2184–95. http://dx.doi.org/10.3397/in-2021-2070.

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Natural quiet and the sounds of nature are important natural resources and experiencing them is an important aspect of outdoor recreation experiences. Anthropogenic sound can negatively impact these resources and diminish the benefits realized from outdoor recreation. On public lands where many types of recreation share trails and landscapes, the sounds produced by some types of recreation (e.g., motorized recreation) can negatively impact the experiences of others. To effectively manage public resources including natural soundscapes and recreation opportunities, public land and recreation managers need an understanding of the effects of recreation-caused sounds like those associated with motorized recreation. Acoustic models for recreation and protected areas provide an essential tool to help in predicting sound levels generated by these anthropogenic sources and can aid in studying the extent of potential recreation conflicts, while providing a definite direction to mitigate such conflicts. An open source outdoor sound propagation model integrated with Geographic Information Systems (GIS) lays out a good foundation for mapping visitor experience affected by sound sources like gas compressors and motorized recreation sounds. The results thus produced present a preliminary version of an outdoor sound propagation tool, to assist parks and state forest services in making important management decisions to refine visitor experience.
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Lee, Sunwoong, Michele Zanolin, Aaron M. Thode, Robert T. Pappalardo, and Nicholas C. Makris. "Probing Europa's interior with natural sound sources." Icarus 165, no. 1 (September 2003): 144–67. http://dx.doi.org/10.1016/s0019-1035(03)00150-7.

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Traer, James, and Josh H. McDermott. "Statistics of natural reverberation enable perceptual separation of sound and space." Proceedings of the National Academy of Sciences 113, no. 48 (November 10, 2016): E7856—E7865. http://dx.doi.org/10.1073/pnas.1612524113.

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In everyday listening, sound reaches our ears directly from a source as well as indirectly via reflections known as reverberation. Reverberation profoundly distorts the sound from a source, yet humans can both identify sound sources and distinguish environments from the resulting sound, via mechanisms that remain unclear. The core computational challenge is that the acoustic signatures of the source and environment are combined in a single signal received by the ear. Here we ask whether our recognition of sound sources and spaces reflects an ability to separate their effects and whether any such separation is enabled by statistical regularities of real-world reverberation. To first determine whether such statistical regularities exist, we measured impulse responses (IRs) of 271 spaces sampled from the distribution encountered by humans during daily life. The sampled spaces were diverse, but their IRs were tightly constrained, exhibiting exponential decay at frequency-dependent rates: Mid frequencies reverberated longest whereas higher and lower frequencies decayed more rapidly, presumably due to absorptive properties of materials and air. To test whether humans leverage these regularities, we manipulated IR decay characteristics in simulated reverberant audio. Listeners could discriminate sound sources and environments from these signals, but their abilities degraded when reverberation characteristics deviated from those of real-world environments. Subjectively, atypical IRs were mistaken for sound sources. The results suggest the brain separates sound into contributions from the source and the environment, constrained by a prior on natural reverberation. This separation process may contribute to robust recognition while providing information about spaces around us.
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Ackermann, David, Christoph Böhm, and Stefan Weinzierl. "On the numerical simulation of natural acoustic sound sources." Journal of the Acoustical Society of America 141, no. 5 (May 2017): 3997. http://dx.doi.org/10.1121/1.4989163.

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STEPHEN, R. O., and J. C. HARTLEY. "The Transmission of Bush-Cricket Calls in Natural Environments." Journal of Experimental Biology 155, no. 1 (January 1, 1991): 227–44. http://dx.doi.org/10.1242/jeb.155.1.227.

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This study discusses the structure of the calls of bush crickets Steropleurus nobrei and examines the way the structure of records of a bush-cricket call, comprising pure tone bursts and bursts of white noise, changes as these sounds propagate through different environments. Measurements of the coherence and spectral composition at different distances from the sound source are made in open and thickly vegetated environments. The results show that coherent frequency components in reproductions of the records of the natural call propagate over greater distances than do other components. The results are discussed in relation to the possible sources of information contained in insect calls and how the environment degrades these information sources as the call propagates away from the source. The consequences of the structure of the calls on the properties of the auditory organs of bush crickets is also discussed.
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MARKOU, Dimitris. "Exploring spatial patterns of environmental noise and perceived sound source dominance in urban areas. Case study: the city of Athens, Greece." European Journal of Geography 13, no. 4 (April 12, 2022): 60–78. http://dx.doi.org/10.48088/ejg.d.mar.13.2.060.078.

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The aim of the present study is to map spatial patterns related to noise pollution and the acoustic environment -in a broader context- in the urban area of Athens, Greece. The primary goal of this thesis is to present a comprehensive approach that combines elements of two basic methodologies related to acoustic environment studies: a) noise mapping and b) the soundscape approach. The main inputs are environmental noise measurements and perceptual sound source-related observations. The results feature three noise pollution maps (LAeq,30 sec, L10, and L90 indices) and three sound source maps which reflect the way in which the human ear perceives the presence of sounds. Additionally, the question of whether the spatial distribution of sound source dominance can be explained by the dispersion of environmental noise levels was examined using geographically weighted regressions (GWR). The GWR models showed that sound source-related observations are explained to a significant extent by all three indicators. Four important findings emerge from the analysis. Firstly, areas with high levels of noise pollution are characterized by high to moderate presence of technological and absence of anthropic and natural sounds. Secondly, regions, where there is a simultaneous presence of all sound sources, are characterized by moderate to low noise levels. Thirdly, the absence of technological sounds is observed in quiet areas. Finally, areas featuring a moderate presence of technological and natural sounds are mostly urban green spaces built-in proximity to the main road network.
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Woods, Kevin J. P., and Josh H. McDermott. "Schema learning for the cocktail party problem." Proceedings of the National Academy of Sciences 115, no. 14 (March 21, 2018): E3313—E3322. http://dx.doi.org/10.1073/pnas.1801614115.

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The cocktail party problem requires listeners to infer individual sound sources from mixtures of sound. The problem can be solved only by leveraging regularities in natural sound sources, but little is known about how such regularities are internalized. We explored whether listeners learn source “schemas”—the abstract structure shared by different occurrences of the same type of sound source—and use them to infer sources from mixtures. We measured the ability of listeners to segregate mixtures of time-varying sources. In each experiment a subset of trials contained schema-based sources generated from a common template by transformations (transposition and time dilation) that introduced acoustic variation but preserved abstract structure. Across several tasks and classes of sound sources, schema-based sources consistently aided source separation, in some cases producing rapid improvements in performance over the first few exposures to a schema. Learning persisted across blocks that did not contain the learned schema, and listeners were able to learn and use multiple schemas simultaneously. No learning was evident when schema were presented in the task-irrelevant (i.e., distractor) source. However, learning from task-relevant stimuli showed signs of being implicit, in that listeners were no more likely to report that sources recurred in experiments containing schema-based sources than in control experiments containing no schema-based sources. The results implicate a mechanism for rapidly internalizing abstract sound structure, facilitating accurate perceptual organization of sound sources that recur in the environment.
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Jo, Song, Ikei, Enomoto, Kobayashi, and Miyazaki. "Physiological and Psychological Effects of Forest and Urban Sounds Using High-Resolution Sound Sources." International Journal of Environmental Research and Public Health 16, no. 15 (July 24, 2019): 2649. http://dx.doi.org/10.3390/ijerph16152649.

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Exposure to natural sounds is known to induce feelings of relaxation; however, only few studies have provided scientific evidence on its physiological effects. This study examined prefrontal cortex and autonomic nervous activities in response to forest sound. A total of 29 female university students (mean age 22.3 ± 2.1 years) were exposed to high-resolution sounds of a forest or city for 60 s, using headphones. Oxyhemoglobin (oxy-Hb) concentrations in the prefrontal cortex were determined by near-infrared spectroscopy. Heart rate, the high-frequency component of heart rate variability (which reflects parasympathetic nervous activity), and the ratio of low-frequency to high-frequency (LF/HF) components (which reflects sympathetic nervous activity) were measured. Subjective evaluation was performed using the modified semantic differential method and profiles of mood states. Exposure to the forest sound resulted in the following significant differences compared with exposure to city sound: decreased oxy-Hb concentrations in the right prefrontal cortex; decreased ln(LF/HF); decreased heart rate; improved feelings described as “comfortable,’’ “relaxed,” and “natural”; and improved mood states. The findings of this study demonstrated that forest-derived auditory stimulation induced physiological and psychological relaxation effects.
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Jambrošić, Kristian, Marko Horvat, Dominik Kisić, and Tin Oberman. "SPEAKER DISCRIMINATION IN MULTISOURCE ENVIRONMENTS AURALIZED IN REAL ROOMS." Akustika, VOLUME 37 (December 15, 2020): 19–37. http://dx.doi.org/10.36336/akustika20203719.

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With the recent development of audio in modern VR/AR systems and the increasing capability of synthesizing natural sound fields over headphones with head tracking, the question of the ability of our hearing system to discriminate multiple concurrent sound sources has become important again. We must understand how psychoacoustical and psychophysical limitations of the hearing system cope with novel technologies of virtual acoustics that can simulate an almost unlimited number of sound sources. Previous research has shown that the capacity of human hearing to discriminate a reference sound source is limited when there is background noise, a reverberant surrounding, or when other, disturbing sound sources simultaneously mask the reference source. A set of listening tests based on the cocktail-party effect was designed to determine the intelligibility of speech emitted by a reference sound source, with one to six disturbing sound sources simultaneously emitting speech from different directions around the listener. The tests were repeated in three test rooms with different acoustical properties, and two test signals were used: logatomes and regular spoken sentences with specific keywords. The results have revealed the changes in speech intelligibility scores in relation to the number of disturbing sources, their positions, and acoustical properties of test rooms.
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Deleforge, Antoine, Florence Forbes, and Radu Horaud. "Acoustic Space Learning for Sound-Source Separation and Localization on Binaural Manifolds." International Journal of Neural Systems 25, no. 01 (January 6, 2015): 1440003. http://dx.doi.org/10.1142/s0129065714400036.

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In this paper, we address the problems of modeling the acoustic space generated by a full-spectrum sound source and using the learned model for the localization and separation of multiple sources that simultaneously emit sparse-spectrum sounds. We lay theoretical and methodological grounds in order to introduce the binaural manifold paradigm. We perform an in-depth study of the latent low-dimensional structure of the high-dimensional interaural spectral data, based on a corpus recorded with a human-like audiomotor robot head. A nonlinear dimensionality reduction technique is used to show that these data lie on a two-dimensional (2D) smooth manifold parameterized by the motor states of the listener, or equivalently, the sound-source directions. We propose a probabilistic piecewise affine mapping model (PPAM) specifically designed to deal with high-dimensional data exhibiting an intrinsic piecewise linear structure. We derive a closed-form expectation-maximization (EM) procedure for estimating the model parameters, followed by Bayes inversion for obtaining the full posterior density function of a sound-source direction. We extend this solution to deal with missing data and redundancy in real-world spectrograms, and hence for 2D localization of natural sound sources such as speech. We further generalize the model to the challenging case of multiple sound sources and we propose a variational EM framework. The associated algorithm, referred to as variational EM for source separation and localization (VESSL) yields a Bayesian estimation of the 2D locations and time-frequency masks of all the sources. Comparisons of the proposed approach with several existing methods reveal that the combination of acoustic-space learning with Bayesian inference enables our method to outperform state-of-the-art methods.
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Dissertations / Theses on the topic "Natural sources of sound"

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Bolin, Karl. "Wind Turbine Noise and Natural Sounds : Masking, Propagation and Modeling." Doctoral thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10434.

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Wind turbines are an environmentally friendly and sustainable power source. Unfortunately, the noise impact can cause deteriorated living conditions for nearby residents. The audibility of wind turbine sound is influenced by ambient sound. This thesis deals with some aspects of noise from wind turbines. Ambient sounds influence the audibility of wind turbine noise. Models for assessing two commonly occurring natural ambient sounds namely vegetation sound and sound from breaking waves are presented in paper A and B. A sound propagation algorithm has been compared to long range measurementsof sound propagation in paper C. Psycho-acoustic tests evaluating the threshold and partial loudness of wind turbine noise when mixed with natural ambient sounds have been performed. These are accounted for in paper D. The main scientific contributions are the following.Paper A: A semi-empiric prediction model for vegetation sound is proposed. This model uses up-to-date simulations of wind profiles and turbulent wind fields to estimate sound from vegetation. The fluctuations due to turbulence are satisfactory estimated by the model. Predictions of vegetation sound also show good agreement to measured spectra. Paper B: A set of measurements of air-borne sound from breaking waves are reported. From these measurements a prediction method of sound from breaking waves is proposed. Third octave spectra from breaking waves are shown to depend on breaker type. Satisfactory agreement between predictions and measurements has been achieved. Paper C: Long range sound propagation over a sea surface was investigated. Measurements of sound transmission were coordinated with local meteorological measurements. A sound propagation algorithm has been compared to the measured sound transmission. Satisfactory agreement between measurements and predictions were achieved when turbulence were taken into consideration in the computations. Paper D: The paper investigates the interaction between wind turbine noise and natural ambient noise. Two loudness models overestimate the masking from two psychoacoustic tests. The wind turbine noise is completely concealed when the ambient sound level (A-weighed) is around 10 dB higher than the wind turbine noise level. Wind turbine noise and ambient noise were presented simultaneously at the same A-weighed sound level. The subjects then perceived the loudness of the wind turbine noise as 5 dB lower than if heard alone. Keywords: Wind turbine noise, masking, ambient noise, long range sound propagation
QC 20100705
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Norris, Richard. "An exploration of cross-genre composition focusing on the combination of natural and synthetic sound sources." Thesis, Royal Holloway, University of London, 2012. http://repository.royalholloway.ac.uk/items/2837960b-20e0-9ec8-dd40-ec05067f86de/11/.

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This portfolio explores a combination of acoustic performance with technology in various guises, including the use of backing tracks alongside an ensemble, the manipulation of live instruments with effects and the use of synthesizers and samplers along with an instrumental ensemble. A key feature that runs through the portfolio is the use of specific non-musical subject themes as inspiration for the music. These include the murders of five prostitutes in Ipswich in 2006 by Steve Wright, a speech by David Davis on people trafficking from 2005, the Mumbai hostage situation and bombings of 2007, drug culture and the sounds of London. A large proportion of the pieces that make up this portfolio have contributed to a fusion album entitled Opposites React. This album explores how acoustic performance can be combined with electronics and includes performances and collaborations with performers, poets, producers and visual artists.
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Комлєва, Поліна Максимівна. "Особливості запису окремих натуральних джерел звукових сигналів в залежності від жанру створюваної програми." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/34885.

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Дипломна робота: 69 c., 2 табл., 19 рис., 31 джерел. Об'єктом дослідження є натуральні, електромузичні інструменти та особливості їх запису. Метою роботи є аналіз акустичних характеристик інструментів та процеси їх запису. Метод дослідження – досліджено запис натуральних та електричних інструментів в залежності від стилю музики та акустичного обладнання. Галузь застосування: студії звукозапису, концертні зали.
69 pp., 2 tab., 19 figures, 31 sources. The object of research are natural, electromusical instruments and features of their recording. The aim of the work is to analyze the acoustic characteristics of instruments and their recording processes. Research method - the recording of natural and electric instruments depending on the style of music and acoustic equipment was studied. Field of application: recording studios, concert halls. As a result of the thesis, the recording of natural and electric instruments depending on the style of music and acoustic equipment was studied.
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Di, Bona Elvira. "Sound and sound sources." Paris, EHESS, 2013. http://www.theses.fr/2013EHES0058.

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Dans cette thèse je vais proposer une théorie de la perception auditive selon laquelle les sons sont strictement attachés aux objets matériels qui sont leurs sources. Dans le Chapitre l, je propose une taxonomie des théories du son. Ma taxonomie range les théories du son dans quatre catégories : le groupe minimaliste, le groupe modéré, le groupe maximaliste et le groupe plus-que-maximaliste. Dans le Chapitre II, je fais deux choses: je traite des questions sur l'a-spatialité de la perception auditive, et ensuite, je caractérise la relation entre les sources sonores et les sons. Par ailleurs, mon intention est de justifier le point de vue maximaliste en défendant une nouvelle théorie du son comme événement vibratoire qui arrive aux sources sonores. Dans le Chapitre III e IV je m'occupe des qualités sonores du son qui sont la hauteur, l'intensité, le timbre, la durée et la location. En générale, je vais montrer que non seulement les qualités sonores peuvent être considérées comme des contreparties perceptibles des propriétés physiques des ondes sonores dans un milieu, mais qu'elles sont aussi en corrélation avec les propriétés physiques de la vibration de l'objet sonore. L'objectif du Chapitre V est d'aborder le problème de la perception directe du son et des sources sonores. En particulier, je vais prétendre que mon analyse des qualités sonores -qui prête une attention particulière au timbre -et la caractérisation du son comme événement source nous permet de conclure que nous pouvons entendre directement les sources sonores -et que nous pouvons, donc, justifier la vue maximaliste. Dans l'Excursus j'évalue la possibilité auditive de percevoir la causalité
Ln this dissertation I defend two theses: the "identity view" and the "maximalist view". According to the first thesis, when we hear sounds, we hear also events and happenings which occur at the sources where sounds have been produced. According to the second thesis, our auditory landscape is constituted by sounds which not only are identical to the audible events occurring at sound sources, but they are also the tools which help us to recover information about the material objects which generate sound. This dissertation is composed by five chapters and an Excursus. In Chapter 1, I propose a taxonomy of sound theories. My taxonomy organises sound theories into four groups: the minimalist group, the moderate group, the maximalist group and the overmaximalist group. In Chapter Il, I deal with issues on the a-spatiality of auditory perception, in the attempt to demonstrate that we hear sound as co-Iocated with sound sources. Furthermore, I define the relation between sound sources and their sounds and justify the identity view by virtue of the distinction between two aspects of sound sources -the thing source (such as bells or violins) and the event source (such as collisions or vibratory events at the object). In Chapters III and IV, I tackle the problem of the audible qualities of sound (pitch, loudness, timbre, duration and location) in the light of the characterization of sound as event source. The objective of the last chapter is the problem of the direct perception of sound and sound sources in the light of the considerations made in the previous chapters. I add an Excursus in which I evaluate the possibility of perceiving causality by audition
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Dong, Bin. "Spatial Separation of Sound Sources." Phd thesis, INSA de Lyon, 2014. http://tel.archives-ouvertes.fr/tel-01059653.

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La séparation aveugle de sources est une technique prometteuse pour l'identification, la localisation, et la classification des sources sonores. L'objectif de cette thèse est de proposer des méthodes pour séparer des sources sonores incohérentes qui peuvent se chevaucher à la fois dans les domaines spatial et fréquentiel par l'exploitation de l'information spatiale. De telles méthodes sont d'intérêt dans les applications acoustiques nécessitant l'identification et la classification des sources sonores ayant des origines physiques différentes. Le principe fondamental de toutes les méthodes proposées se décrit en deux étapes, la première étant relative à la reconstruction du champ source (comme par exemple à l'aide de l'holographie acoustique de champ proche) et la seconde à la séparation aveugle de sources. Spécifiquement, l'ensemble complexe des sources est d'abord décomposé en une combinaison linéaire de fonctions de base spatiales dont les coefficients sont définis en rétropropageant les pressions mesurées par un réseau de microphones sur le domaine source. Cela conduit à une formulation similaire, mais pas identique, à la séparation aveugle de sources. Dans la seconde étape, ces coefficients sont séparés en variables latentes décorrélées, affectées à des "sources virtuelles" incohérentes. Il est montré que ces dernières sont définies par une rotation arbitraire. Un ensemble unique de sources sonores est finalement résolu par la recherche de la rotation (par gradient conjugué dans la variété Stiefel des matrices unitaires) qui minimise certains critères spatiaux, tels que la variance spatiale, l'entropie spatiale, ou l'orthogonalité spatiale. Il en résulte la proposition de trois critères de séparation à savoir la "moindre variance spatiale", la "moindre entropie spatiale", et la "décorrélation spatiale", respectivement. De plus, la condition sous laquelle la décorrélation classique (analyse en composantes principales) peut résoudre le problème est établit de une manière rigoureuse. Le même concept d'entropie spatiale, qui est au coeur de cette thèse, est également iv exploité dans la définition d'un nouveau critère, la courbe en L entropique, qui permet de déterminer le nombre de sources sonores actives sur le domaine source d'intérêt. L'idée consiste à considérer le nombre de sources qui réalise le meilleur compromis entre une faible entropie spatiale (comme prévu à partir de sources compactes) et une faible entropie statistique (comme prévu à partir d'une faible erreur résiduelle). La méthode proposée est validée à la fois sur des expériences de laboratoire et des données numériques et illustrée par un exemple industriel concernant la classification des sources sonores sur la face supérieure d'un moteur Diesel. La méthodologie peut également séparer, de façon très précise, des sources dont les amplitudes sont de 40 dB inférieur aux sources les plus fortes. Aussi, la robustesse vis-à-vis de l'estimation du nombre de sources actives, de la distance entre le domaine source d'intérêt et le réseau de microphones, ainsi que de la taille de la fonction d'ouverture est démontrée avec succès.
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Lee, JungSuk. "Categorization and modeling of sound sources for sound analysis/synthesis." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116954.

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In this thesis, various sound analysis/re-synthesis schemes are investigated in a source/filter model framework, with emphasis on the source component. This research provides improved methods and tools for sound designers, composersand musicians to flexibly analyze and synthesize sounds used for gaming, film or computer music, ranging from abstract, complex sounds to those of real musical instruments. First, an analysis-synthesis scheme for the reproduction of a rolling ball sound is presented. The proposed scheme is based on the assumption that the rolling sound is generated by a concatenation of micro-contacts between a ball and a surface, each having associated resonances. Contact timing information is extracted from the rolling sound using an onset detection process, allowing for segmentation of a rolling sound. Segmented sound snippets are presumed to correspond to micro-contacts between a ball and a surface; thus, subband based linear predictions (LP) are performed to model time-varying resonances and anti-resonances. The segments are then resynthesized and overlap-added to form a complete rolling sound. A "granular" analysis/synthesis approach is also applied to various kinds of environmental sounds (rain, fireworks, walking, clapping) as an additional investigation into how the source type influences the strategic choices for the analysis/synthesis of sounds. The proposed granular analysis/synthesis system allows for flexible analysis of complex sounds and re-synthesis with temporal modification. Lastly, a novel approach to extract a pluck excitation from a recorded plucked string sound is proposed within a source / filter context using physical models. A time domain windowing method and an inverse filtering-based method are devised based on the behavior of wave propagation on the string. In addition, a parametric model of the pluck excitation as well as a method to estimate its parameters are addressed.
Dans cette thèse, nous avons étudié plusieurs scéhmas d'analyse/synthèse dans le cadre des modèles source/filtre, avec un attention particulière portée sur la composante de source. Cette recherche améliore les méthodes ainsi que les outils fournis créateurs de sons, compositeurs et musiciens désirant analyser et synthétiser avec flexibilité des sons destinés aux jeux vidéos, au cinéma ou à la musique par ordinateur. Ces sons peuvent aller de sons abstraits et complexes à ceux provenant d'instruments de musique existants. En premier lieu, un schéma d'analyse-synthèse est introduit permettant la reproduction du son d'une balle en train de rouler. Ce schéma est fondé sur l'hypothèse que le son de ce roulement est généré par la concaténation de micro-contacts entre balle et surface, chacune d'elles possédant sa proper série de résonances. L'information relative aux temps de contact est extradite du son du roulement que l'on cherche à reproduire au moyen d'une procédure détectant le début du son afin de le segmenter. Les segments de son ainsi isolés sont supposés correspondre aux micro-contacts entre la balle et la surface. Ainsi un algorithme de prédiction linéaire est effectué par sous-bande, préalablement extraites afin de modéliser des résonances et des anti-résonances variants dans le temps. Les segments sont ensuite re-synthétisés, superposés et additionnés pour reproduire le son du roulement dans son entier. Cette approche d'analyse/synthèse "granulaire" est également appliquée à plusieurs sons de types environnementaux (pluie, feux d'artifice, marche, claquement) afin d'explorer plus avant l'influence du type de la source sur l'analyse/synthèse des sons. Le système proposé permet une analyse flexible de sons complexes et leur synthèse, avec la possibilité d'ajouter des modifications temporelles.Enfin, une approche novatrice pour extraire le signal d'excitation d'un son de corde pincée est présentée dans le contexte de schémas source/filtre sur une modèlisation physique. A cet effet, nous introduisons une méthode de type fenêtrage, et une méthode de filtrage inverse fondée sur le type de propagation selon laquelle l'onde se déplace le long de la corde. De plus, un modèle paramétrique de l'excitation par pincement ainsi qu'une méthode d'estimation de ces paramètres sont détaillés.
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Boyle, M. V. "The characterisation of complex sound sources." Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546011.

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Ito, Masanori, Yoshinori Takeuchi, Tetsuya Matsumoto, Hiroaki Kudo, and Noboru Ohnishi. "Blind Signal Separation of Moving Sound Sources." INTELLIGENT MEDIA INTEGRATION NAGOYA UNIVERSITY / COE, 2004. http://hdl.handle.net/2237/10347.

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Thite, Anand Narasinha. "Inverse determination of structure-borne sound sources." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273993.

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Saussus, Patrick T. "Investigation into sound sources for anechoic chamber qualification and related sound issues." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/17910.

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Books on the topic "Natural sources of sound"

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Kerman, B. R., ed. Natural Physical Sources of Underwater Sound. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8.

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Kerman, B. R. Natural physical sources of underwater sound: Sea surface sound (2). Dordrecht: Springer Science, 1993.

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United States. President (2001- : Bush), ed. Reliable, affordable, and environmentally sound energy for America's future: Report of the National Energy Policy Development Group. Washington, DC: [The Group], 2001.

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Narasiṃhaṃ, Uppala. Nādaṃ =: [Natural sound]. Hyderabad: Gnanam Publications, 2009.

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Narasiṃhaṃ, Uppala. Nādaṃ =: [Natural sound]. Hyderabad: Gnanam Publications, 2009.

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Narasiṃhaṃ, Uppala. Nādaṃ =: [Natural sound]. Hyderabad: Gnanam Publications, 2009.

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Narasiṃhaṃ, Uppala. Nādaṃ =: [Natural sound]. Hyderabad: Gnanam Publications, 2009.

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Uosukainen, Seppo. Turbulences as sound sources. Espoo [Finland]: VTT Technical Research Centre of Finland, 2003.

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Service, Canadian Wildlife. Natural History of Digges Sound. S.l: s.n, 1985.

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Yost, William A., Arthur N. Popper, and Richard R. Fay, eds. Auditory Perception of Sound Sources. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-71305-2.

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Book chapters on the topic "Natural sources of sound"

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Williams, J. E. Ffowcs. "Near Surface Sound Mechanisms." In Natural Physical Sources of Underwater Sound, 315–27. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_24.

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Pumphrey, H. C. "Sources of Underwater Rain Noise." In Natural Physical Sources of Underwater Sound, 683–96. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_51.

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Ostrovsky, L. A., and A. M. Sutin. "Nonlinear Sound Scattering from Subsurface Bubble Layers." In Natural Physical Sources of Underwater Sound, 363–70. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_28.

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Jacobs, David C., Charles S. Cox, and Xin Zhang. "Observations of the Near-Field Double Frequency Pressure Spectrum in the Upper Ocean Using the Cartesian Diver Profiling Instrument." In Natural Physical Sources of Underwater Sound, 175–88. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_15.

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Didenkulov, I. N., and A. S. Korotkov. "The Measurement of Underwater Noise Characteristics in Shallow Water." In Natural Physical Sources of Underwater Sound, 45–49. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_4.

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Thorne, P. D. "Seabed Saltation Noise." In Natural Physical Sources of Underwater Sound, 721–44. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_54.

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Buckingham, M. J. "Ocean Acoustic Propagation and Ambient Noise in a Surface Duct." In Natural Physical Sources of Underwater Sound, 1–15. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_1.

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Purcell, Anthony J. "The Perceived Source Directivity of Surface-Generated Ambient Noise." In Natural Physical Sources of Underwater Sound, 111–20. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_10.

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Marrett, R., and N. R. Chapman. "Low frequency noise measurements in an ambient environment dominated by natural sources of sound." In Natural Physical Sources of Underwater Sound, 121–36. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_11.

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Rohr, Jim, and Garr Updegraff. "The Effect of Monomolecular Films on Low Sea State Ambient Noise." In Natural Physical Sources of Underwater Sound, 137–50. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_12.

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Conference papers on the topic "Natural sources of sound"

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Frank, Leslie D., and Gerald J. Milner. "Isolation of Major Noise Sources on Natural Gas Turbomachinery Packages." In ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-086.

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Designing for engineering noise control to be applied on turbomachinery packages requires that one be able to isolate and quantify the amount of acoustical energy radiated by each mechanical component individually. The ability to order-rank these noise source contributors allows one to assess the degree of noise control required in order to provide a cost effective noise control design. Conventional sound measurements, especially within buildings, are not adequate to clearly identify individual noise sources and provide order ranking of sources. A measurement technique known as sound intensity does allow one to isolate and measure acoustic power in-situ on individual components. The sound intensity technique in conjunction with sound pressure level predictions was utilized by Nova Corporation of Alberta to assess the major noise source contributors on 10.6MW and 24.9MW turbomachinery packages. The test results clearly indicated which components required selective noise control in order to achieve optimum and cost effective silencing.
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Botros, K. K., A. Hawryluk, J. Geerligs, B. Huynh, and R. Phernambucq. "Innovation in Noise Mapping in Natural Gas Compressor Stations." In 2010 8th International Pipeline Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ipc2010-31048.

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Noise is generated at gas turbine-based compressor stations from a number of sources, including turbomachinery (gas turbines and compressors), airflow through inlet ducts and scrubbers, exhaust stacks, aerial coolers, and auxiliary systems. Understanding these noise sources is necessary to ensure that the working conditions on site are safe and that the audible noise at neighbouring properties is acceptable. Each noise source has different frequency content, and the overall sound pressure level (OSPL) at any location in the station yard or inside the compressor building is the result of a superposition of these noise sources. This paper presents results of multiple-point spectral noise measurements at three of TransCanada’s compressor stations on the Alberta System. A method is described to determine the overall noise map of the station yard using Delaunay Triangulation and Natural-Neighbour Interpolation techniques. The results are presented in OSPL maps, as well as animated pictures of the sound pressure level (SPL) in frequency domain which will be shown on a video at the conference. The latter will be useful in future work to determine the culprit sources and the respective dominant frequency range that contributes the most to the OSPL.
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Siller, Henri A. "Localisation of Sound Sources on Aircraft in Flight." In ASME 2012 Noise Control and Acoustics Division Conference at InterNoise 2012. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ncad2012-0575.

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This paper presents beamforming techniques for source localization on aicraft in flight with a focus on the development at DLR in Germany. Fly-over tests with phased arrays are the only way to localize and analyze the different aerodynamic and engine sources of aircraft in flight. Many of these sources cannot be simulated numerically or in wind-tunnel tests because they they are either unknown or they cannot be resolved properly in model scale. The localization of sound sources on aircraft in flight is performed using large microphone arrays. For the data analysis, the source signals at emission time are reconstructed from the Doppler-shifted microphone data using the measured flight trajectory. Standard beamforming techniques in the frequency domain cannot be applied due transitory nature of the signals, so the data is usually analyzed using a classical beamforming algorithm in the time domain. The spatial resolution and the dynamic range of the source maps can be improved by calculating a deconvolution of the sound source maps with the point spread function of the microphone array. This compensates the imaging properties of the microphone array by eliminating side lobes and aliases. While classical beamfoming yields results that are more qualitative by nature, the deconvolution results can be used to integrate the acoustic power over the different source regions in order to obtain the powers of each source. ranking of the sources. These results can be used to rank the sources, for acoustic trouble shooting, and to assess the potential of noise abatement methods.
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Oǧuz, Hasan N. "MODELING OF BUBBLE CLOUDS AS SOURCES OF LOW FREQUENCY UNDERWATER NOISE." In Proceedings of the III International Meeting on Natural Physical Processes Related to Sea Surface Sound. WORLD SCIENTIFIC, 1996. http://dx.doi.org/10.1142/9789814447102_0022.

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Johns, W. D., and R. H. Porter. "Ranking of Compressor Station Noise Sources Using Sound Intensity Techniques." In ASME 1987 International Gas Turbine Conference and Exhibition. American Society of Mechanical Engineers, 1987. http://dx.doi.org/10.1115/87-gt-240.

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Local residential development and the introduction of more restrictive noise regulations in Canada and the United States are creating a need to improve the noise abatement systems at many existing industrial sites including pipeline compressor stations. The initial phase of any silencing program should include a study to identify and rank the noise sources. Until recently, this type of noise study has been qualitative and inexact, requiring a trial and error approach which addressed only one or two sources at a time and often resulted in a prolonged and costly silencing program. The use of sound intensity techniques to determine sound power levels of all noise sources results in lower costs, improved job scheduling and greater likelihood of success of a silencing program. This paper discusses a case study which uses sound intensity techniques to rank noise sources at a natural gas compressor plant powered by a gas turbine.
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Collins, M. D., L. T. Fialkowski, N. C. Makris, J. S. Perkins, and W. A. Kuperman. "Source localization in noisy ocean environments." In Proceedings of the III International Meeting on Natural Physical Processes Related to Sea Surface Sound. WORLD SCIENTIFIC, 1996. http://dx.doi.org/10.1142/9789814447102_0030.

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Zakarauskas, Pierre, Michael V. Greening, and Stanley E. Dosso. "RIDGE SOURCE LOCALIZATION THROUGH MATCHED-FIELD PROCESSING." In Proceedings of the III International Meeting on Natural Physical Processes Related to Sea Surface Sound. WORLD SCIENTIFIC, 1996. http://dx.doi.org/10.1142/9789814447102_0033.

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Dubrovsky, Nikolai A., and Vladimir M. Frolov. "THUNDERSTORM AS A SOURCE OF SOUNDS IN THE OCEAN." In Proceedings of the III International Meeting on Natural Physical Processes Related to Sea Surface Sound. WORLD SCIENTIFIC, 1996. http://dx.doi.org/10.1142/9789814447102_0008.

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Jonson, Michael L., and Steven D. Young. "An Investigation Into Acoustic Dipole Source Calibration Methods for Turbomachinery Sound Radiation in Reverberant Fields." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66815.

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In-situ calibration methods using a single spherical-shaped transmitting hydrophone (idealized as a monopole acoustic source) have traditionally been used for radiated sound measurements of turbomachinery performed in the Garfield Thomas 1.22-m diameter water tunnel located at The Pennsylvania State University’s Applied Research Laboratory (ARL Penn State). In this reverberant field, the monopole source containing known transmitting characteristics was used to calibrate acoustic sensors that were either near or far from the source. This method typically works well when the type of source is monopole in nature; however, many acoustics sources can be dipole or quadrupole in nature. In this study we investigated the applicability of using dipole sources in a space such as a well-characterized reverberant tank, and we found through a virtual dipole method that the radiation still appears monopole in the reverberant field. The method was extended for the vibration of a panel (a known dipole source) and once again the monopole assumption for the in-situ calibration for a near-field hydrophone and conventional reverberant hydrophones remained consistent.
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Schneider, Manfred, and Jürgen Mann. "Noise Control Technology With Reference to Natural Gas Compressor Stations Under the Aspect of Investment Costs." In ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-237.

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For the conveyance and storage of natural gas, compressor stations are required where the installed power output varies mostly between 1 MW and 20 MW. The noise control measures involved to meet the environmental noise immission regulations in Europe will be presented. The most economical methods of noise control techniques are described particularly for the intake system and the exhaust system of gas turbines, the housing of such engines and for peripheral sound sources like gas coolers, oil coolers and the above ground piping.
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Reports on the topic "Natural sources of sound"

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Branstetter, Brian K. Auditory Masking Patterns in Bottlenose Dolphins from Anthropogenic and Natural Sound Sources. Fort Belvoir, VA: Defense Technical Information Center, September 2011. http://dx.doi.org/10.21236/ada598414.

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Job, Jacob. Mesa Verde National Park: Acoustic monitoring report. National Park Service, July 2021. http://dx.doi.org/10.36967/nrr-2286703.

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In 2015, the Natural Sounds and Night Skies Division (NSNSD) received a request to collect baseline acoustical data at Mesa Verde National Park (MEVE). Between July and August 2015, as well as February and March 2016, three acoustical monitoring systems were deployed throughout the park, however one site (MEVE002) stopped recording after a couple days during the summer due to wildlife interference. The goal of the study was to establish a baseline soundscape inventory of backcountry and frontcountry sites within the park. This inventory will be used to establish indicators and thresholds of soundscape quality that will support the park and NSNSD in developing a comprehensive approach to protecting the acoustic environment through soundscape management planning. Additionally, results of this study will help the park identify major sources of noise within the park, as well as provide a baseline understanding of the acoustical environment as a whole for use in potential future comparative studies. In this deployment, sound pressure level (SPL) was measured continuously every second by a calibrated sound level meter. Other equipment included an anemometer to collect wind speed and a digital audio recorder collecting continuous recordings to document sound sources. In this document, “sound pressure level” refers to broadband (12.5 Hz–20 kHz), A-weighted, 1-second time averaged sound level (LAeq, 1s), and hereafter referred to as “sound level.” Sound levels are measured on a logarithmic scale relative to the reference sound pressure for atmospheric sources, 20 μPa. The logarithmic scale is a useful way to express the wide range of sound pressures perceived by the human ear. Sound levels are reported in decibels (dB). A-weighting is applied to sound levels in order to account for the response of the human ear (Harris, 1998). To approximate human hearing sensitivity, A-weighting discounts sounds below 1 kHz and above 6 kHz. Trained technicians calculated time audible metrics after monitoring was complete. See Methods section for protocol details, equipment specifications, and metric calculations. Median existing (LA50) and natural ambient (LAnat) metrics are also reported for daytime (7:00–19:00) and nighttime (19:00–7:00). Prominent noise sources at the two backcountry sites (MEVE001 and MEVE002) included vehicles and aircraft, while building and vehicle predominated at the frontcountry site (MEVE003). Table 1 displays time audible values for each of these noise sources during the monitoring period, as well as ambient sound levels. In determining the current conditions of an acoustical environment, it is informative to examine how often sound levels exceed certain values. Table 2 reports the percent of time that measured levels at the three monitoring locations were above four key values.
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Carey, William M. Sound Sources and Levels in the Ocean. Fort Belvoir, VA: Defense Technical Information Center, May 2004. http://dx.doi.org/10.21236/ada426834.

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Thode, Aaron. Tomographic & Geophysical Inversions from Opportunistic Sound Sources. Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada612163.

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Skone, Timothy J. Natural Gas Extraction, Other Venting Point Sources. Office of Scientific and Technical Information (OSTI), January 2013. http://dx.doi.org/10.2172/1509091.

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Skone, Timothy J. Natural Gas Processing, Other Venting Point Sources. Office of Scientific and Technical Information (OSTI), January 2013. http://dx.doi.org/10.2172/1509094.

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Gilkey, Robert H. Pattern Analysis Based Models of Masking by Spatially Separated Sound Sources. Fort Belvoir, VA: Defense Technical Information Center, June 1992. http://dx.doi.org/10.21236/ada253036.

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Eisenbud, M. Environmental radioactivity from natural, industrial, and military sources. Office of Scientific and Technical Information (OSTI), January 1987. http://dx.doi.org/10.2172/5601702.

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Skone, Timothy J., James Littlefield, Robert Eckard, Greg Cooney, and Joe Marriott. Role of Alternative Energy Sources: Natural Gas Technology Assessment. Office of Scientific and Technical Information (OSTI), June 2012. http://dx.doi.org/10.2172/1515241.

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Kanner, Joseph, John O. Kinsella, Dan Palevitch, Eli Putievsky, and Uzi Ravid. Herbs and Spices as Potential Sources of Natural Antioxidants. United States Department of Agriculture, January 1986. http://dx.doi.org/10.32747/1986.7566727.bard.

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