Relevant bibliographies by topics / Classification of loudspeakers

Academic literature on the topic 'Classification of loudspeakers'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Classification of loudspeakers"

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Eichenauer, Anja, Uwe Baumann, Timo Stöver, and Tobias Weissgerber. "Interleaved Acoustic Environments: Impact of an Auditory Scene Classification Procedure on Speech Perception in Cochlear Implant Users." Trends in Hearing 25 (January 2021): 233121652110141. http://dx.doi.org/10.1177/23312165211014118.

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Clinical speech perception tests with simple presentation conditions often overestimate the impact of signal preprocessing on speech perception in complex listening environments. A new procedure was developed to assess speech perception in interleaved acoustic environments of different complexity that allows investigation of the impact of an automatic scene classification (ASC) algorithm on speech perception. The procedure was applied in cohorts of normal hearing (NH) controls and uni- and bilateral cochlear implant (CI) users. Speech reception thresholds (SRTs) were measured by means of a matrix sentence test in five acoustic environments that included different noise conditions (amplitude modulated and continuous), two spatial configurations, and reverberation. The acoustic environments were encapsulated in a randomized, mixed order single experimental run. Acoustic room simulation was played back with a loudspeaker auralization setup with 128 loudspeakers. 18 NH, 16 unilateral, and 16 bilateral CI users participated. SRTs were evaluated for each individual acoustic environment and as mean-SRT. Mean-SRTs improved by 2.4 dB signal-to-noise ratio for unilateral and 1.3 dB signal-to-noise ratio for bilateral CI users with activated ASC. Without ASC, the mean-SRT of bilateral CI users was 3.7 dB better than the SRT of unilateral CI users. The mean-SRT indicated significant differences, with NH group performing best and unilateral CI users performing worse with a difference of up to 13 dB compared to NH. The proposed speech test procedure successfully demonstrated that speech perception and benefit with ASC depend on the acoustic environment.
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Amiryarahmadi, Nata, and Wolfgang Kropp. "A virtual design studio for low frequency impact sound from walking." Acta Acustica 5 (2021): 40. http://dx.doi.org/10.1051/aacus/2021033.

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Experience with wooden multi-storey houses have shown that impact sound insulation is one of most critical issues to ensure a good indoor environment. Even in cases where the impact sound insulation is fulfilled, people perceive the sound from e.g. walking neighbours as very disturbing. To investigate the subjective perception, a test facility is needed which allows for a coherent evaluation of different floor designs by listening test. The facility should ensure, that when comparing different floors, the same excitation by a walker and the same receiving room are involved. Only the floor design should be changed. As a consequence the spread in the data will only be due to the spread in the perception by subjects. In this paper a virtual design tool for low frequency impact sound insulation is presented, which consists of four parts; measured walking forces, floor models, an auralisation system which consists of a grid of loudspeakers simulating the vibration of the floor and a receiving room furnished as a common living room. In a pilot study a listening test is carried out for 13 different floors with different impact sound spectra at frequencies below 100 Hz. The results indicate that the judged annoyance strongly correlates with the judged loudness. However, there is a substantial spread observed in between the subjects participating in the listening tests. To understand this spread, a more extended study is needed with more participants and a classification of the subjects with respect to criteria such as noise sensitivity or age.
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Bonetti, Leonardo, and Marco Costa. "Pitch-verticality and pitch-size cross-modal interactions." Psychology of Music 46, no. 3 (June 2, 2017): 340–56. http://dx.doi.org/10.1177/0305735617710734.

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Two studies were conducted on cross-modal matching between pitch and sound source localization on the vertical axis, and pitch and size. In the first study 100 Hz, 200 Hz, 600 Hz, and 800 Hz tones were emitted by a loudspeaker positioned 60 cm above or below to the participant’s ear level. Using a speeded classification task, 30 participants had to indicate the sound source in 160 trials. Both reaction times and errors were analyzed. The results showed that in the congruent condition of high-pitched tones emitted from the upper loudspeaker, reaction times were significantly faster and the number of errors was significantly lower. Pitch was mapped on the vertical axis for sound localization. A main effect for sound source direction was also found. Tones coming from the upper loudspeaker were recognized faster and more accurately. Males were faster than females in identifying sound source direction. In the second experiment, 20 participants had to match 21 tones varying in pitch with 9 circles differing in visual angle on 42 trials. The results showed a clear inverse linear association between log-spaced tone pitch and circle diameter.
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Jeong, Jeongho. "Subjective responses between real impact sound and rubber ball im-pact sound." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 3 (August 1, 2021): 3795–99. http://dx.doi.org/10.3397/in-2021-2523.

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By the recent COVID-19 situation, people stay more time in their home and abatements on noise between neighbouring units are increasing. Heavy/soft impact sound is one of the major noise sources in high-rise apartment buildings. Standardized heavy/soft impact source is known for having the most similar physical and subjective characteristics with real impact sound such as a child running, jumping and an adult walking. The single number quantity on the rubber ball was standardized. A classification scheme for rubber ball impact sound needs to be standardized. Several studies on subjective responses were conducted on rubber ball impact sound in various situations. In this study, subjective responses on the rubber impact sound and real impact sound were compared. The subjective experiment was conducted in the listening chamber which is furnished similarly to the typical living room of Korean apartment buildings. In the experiment, rubber ball impact sounds recorded in the real apartment building and real impact sound recorded in the mock-up building were presented through a sub-woofer and multi-channel loudspeaker system. Subjective responses were collected with an 11 points SD scale.
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Hongisto, Valtteri, and Jukka Keränen. "Comfort Distance—A Single-Number Quantity Describing Spatial Attenuation in Open-Plan Offices." Applied Sciences 11, no. 10 (May 18, 2021): 4596. http://dx.doi.org/10.3390/app11104596.

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ISO 3382-3 is globally used to determine the room acoustic conditions of open-plan offices using in situ measurements. The key outcomes of the standard are three single-number quantities: distraction distance, rD, A-weighted sound pressure level of speech, Lp,A,S,4m, and spatial decay rate of speech, D2,S. Quantities Lp,A,S,4m and D2,S describe the attenuation properties of the office due to room and furniture absorption and geometry. Our purpose is to introduce a new single-number quantity, comfort distance rC, which integrates the quantities Lp,A,S,4m and D2,S. It describes the distance from an omnidirectional loudspeaker where the A-weighted sound pressure level of normal speech falls below 45 dB. The study explains why the comfort criterion level is set to 45 dB, explores the comfort distances in 185 offices reported in previous studies. Based on published data, the rC values lie typically within 3 m (strong attenuation) and 30 m (weak attenuation). Based on this data, a classification scheme was proposed. The new quantity could benefit the revised version of ISO 3382-3.
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Huang, Mincong, and Jonas Braasch. "Location-aware synthesis of walkable urban soundscapes in room-centered immersive virtual reality system." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A251. http://dx.doi.org/10.1121/10.0011228.

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This work, situated at Rensselaer’s Collaborative-Research Augmented Immersive Virtual Environment Laboratory (CRAIVE-Lab), demonstrates a system that utilizes the facility’s panoramic display and multichannel wave field synthesis loudspeaker array to simulate navigable human-scale urban environments with automatically generated virtual soundscapes. The system positions the CRAIVE-Lab’s virtual footprint within the Unity game engine and provides it with the capability to move within virtual space. With geo-location input, the system uses ArcGIS to extract geospatial features, suchas urban topologies and building extrusions. The same input is also used to retrieve real-time weather data from open-source databases (i.e., OpenWeather). Based upon the extracted information, the system updates acoustic signatures of the virtual surroundings by performing a multi-channelray-tracing analysis at a fixed time frame. The resulting signatures are then used to generate environmental noise profiles and process auto-generatedvirtual sound sources present in the environment using wave field synthesis and an extension of multiple audio datasets typically used for model training in urban sound classification (i.e., UrbanSound8K). We present the results as part of an in situ audiovisual experience where users can stand in the CRAIVE-Lab’s physical enclosure and walk about the virtual landscape in which they are immersed.
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Tian, Xuexin, Yimeng Liu, Zengzhi Guo, Jieqing Cai, Jie Tang, Fei Chen, and Hongzheng Zhang. "Cerebral Representation of Sound Localization Using Functional Near-Infrared Spectroscopy." Frontiers in Neuroscience 15 (December 14, 2021). http://dx.doi.org/10.3389/fnins.2021.739706.

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Sound localization is an essential part of auditory processing. However, the cortical representation of identifying the direction of sound sources presented in the sound field using functional near-infrared spectroscopy (fNIRS) is currently unknown. Therefore, in this study, we used fNIRS to investigate the cerebral representation of different sound sources. Twenty-five normal-hearing subjects (aged 26 ± 2.7, male 11, female 14) were included and actively took part in a block design task. The test setup for sound localization was composed of a seven-speaker array spanning a horizontal arc of 180° in front of the participants. Pink noise bursts with two intensity levels (48 dB/58 dB) were randomly applied via five loudspeakers (–90°/–30°/–0°/+30°/+90°). Sound localization task performances were collected, and simultaneous signals from auditory processing cortical fields were recorded for analysis by using a support vector machine (SVM). The results showed a classification accuracy of 73.60, 75.60, and 77.40% on average at –90°/0°, 0°/+90°, and –90°/+90° with high intensity, and 70.60, 73.6, and 78.6% with low intensity. The increase of oxyhemoglobin was observed in the bilateral non-primary auditory cortex (AC) and dorsolateral prefrontal cortex (dlPFC). In conclusion, the oxyhemoglobin (oxy-Hb) response showed different neural activity patterns between the lateral and front sources in the AC and dlPFC. Our results may serve as a basic contribution for further research on the use of fNIRS in spatial auditory studies.
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Dissertations / Theses on the topic "Classification of loudspeakers"

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Руденко, Іван Леонідович. "Планарна електродинамічна акустична система." Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/30597.

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Проведено огляд історії розвитку виробництва перетворювачів та електродинамічних перетворювачів. Приведено повну класифікацію гучномовців та їх принцип дії. Здійснили глибокий аналіз конструкції електродинамічних перетворювачів та їх принцип дії. Приведені основні елементи конструктивних рішень. Виконано моделювання конструктивного рішення планарного електродинамічного перетворювача. Виконано моделювання роботи магнітної та коливальної системи. Приведено графіки основних результатів моделювання та експериментальних вимірювань. Структура та об’єм роботи: дипломна робота складається з вступу, 3 розділів, висновків, списку використаної літератури. Загальний обсяг дипломної роботи складає (106) сторінок. Робота містить рисунків, (48) таблиць (20) та список використаних джерел із (12) найменувань.
A review of the history of the production of converters and electrodynamic transducers was conducted. The full classification of speakers and their principle of action are given. The deep analyzes of the structures of electrodynamic transducers and their principle of action are carried out. The basic elements of constructive decisions are given. The simulation of the constructive decision of a planar electrodynamic converter is executed. The simulation of the work of the magnetic and oscillating system is performed. The graphs of the main results of simulation and experimental measurements are presented. Structure and volume of work: the thesis consists of the introduction, 3 chapters, conclusions, list of used literature. The total volume of the thesis is (106) pages. The work contains drawings, (48) tables (20) and list of sources used from (12) names.
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Ziemer, Tim, and Nico Plath. "Microphone and Loudspeaker Array Signal Processing Steps towards a “Radiation Keyboard” for Authentic Samplers." MDPI, 2020. https://slub.qucosa.de/id/qucosa%3A70630.

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To date electric pianos and samplers tend to concentrate on authenticity in terms of temporal and spectral aspects of sound. However, they barely recreate the original sound radiation characteristics, which contribute to the perception of width and depth, vividness and voice separation, especially for instrumentalists, who are located near the instrument. To achieve this, a number of sound field measurement and synthesis techniques need to be applied and adequately combined. In this paper we present the theoretic foundation to combine so far isolated and fragmented sound field analysis and synthesis methods to realize a radiation keyboard, an electric harpsichord that approximates the sound of a real harpsichord precisely in time, frequency, and space domain. Potential applications for such a radiation keyboard are conservation of historic musical instruments, music performance, and psychoacoustic measurements for instrument and synthesizer building and for studies of music perception, cognition, and embodiment.
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Horky, Steve. "Konzeption und Herstellung von Systemdemonstratoren für miniaturisierte Im-Ohr-Lautsprecher mit drahtlosen Kommunikationsschnittstellen." 2018. https://htw-dresden.qucosa.de/id/qucosa%3A33802.

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Die Diplomarbeit mit dem Thema: 'Konzeption und Herstellung von Systemdemonstratoren für miniaturisierte Im-Ohr-Lautsprecher mit drahtlosen Kommunikationsschnittstellen' konzentriert sich auf die Auslegung einer Schaltung eines neuartigen Lautsprechers, welche auf dem Prinzip der NED-Aktoren ('Nanoskaliger elektrostatischer Antrieb') arbeiten. Des Weiteren werden Gehäuse für die Im-Ohr-Anwendung als auch die Freifeldanwendung entwickelt.:Symbolverzeichnis Abkürzungsverzeichnis 1 Einleitung 2 Stand der Technik 2.1 Im-Ohr-Lautsprecher 2.2 Drahtlose Kommunikation 2.3 Kommerzielle Piezotreiber 3 Anforderungen an den Systemdemonstrator 4 Chipaufnahme 4.1 Anforderung 4.2 Konzeption und Umsetzung 5 Drahtlose Kommunikation 5.1 Anforderung 5.2 Konzept 5.3 Umsetzung 6 Verstärker 6.1 Anforderung 6.2 Konzeption und Umsetzung 6.2.1 Validierung des DRV2700 6.2.2 Thermisches Management der Verstärkerschaltung 6.3 Modellierung des Gehäuses für die Elektronik 7 Im-Ohr-Demonstrator 7.1 Anforderung 7.2 Konzeption und Umsetzung 8 Horn-Demonstrator 8.1 Anforderung 8.2 Konzeption und Umsetzung 9 Ergebnisse 9.1 Chipaufnahme 9.2 Verstärker 9.3 Gehäuse für Elektronik 9.4 Im-Ohr-Lautsprecher 9.5 Akustisches Horn 10 Realisierung mittels Entwicklungsplatine 11 Diskussion und Ausblick 12 Zusammenfassung Literatur Selbstständigkeitserklärung Anhang
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Conference papers on the topic "Classification of loudspeakers"

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Choi, Jaewon, and Michael D. Bryant. "Diagnostics of Mechanical Faults of Loudspeakers Using Principal Component Analysis and Fisher’s Discriminant Analysis." In ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control. ASMEDC, 2011. http://dx.doi.org/10.1115/dscc2011-6198.

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This study illustrates a novel model based FDI method for the common mechanical faults arising during the manufacture of loudspeakers. To overcome the drawbacks of the conventional signal based approaches, the Bayesian classification of impulse responses based on a model based fault symptom database is proposed. The loudspeaker model is estimated via IRES and ARMA techniques. The fault symptom database is constructed with a novel nonlinear loudspeaker model. The performances of Principal Component Analysis (PCA) and Fisher’s Discriminant Analysis (FDA) are compared. The results show the effectiveness of the proposed method. It is also shown that the FDA based classifier performs better than PCA in terms of the accuracy and consistency of the healthy baseline estimation. However, the fault isolation is difficult due to the similarities of fault signatures.
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Wei, Junfeng, Yi Yang, Zhoubin Wen, and Haihong Feng. "Loudspeaker defect detection and classification using Support Vector Machine." In 2010 Seventh International Conference on Fuzzy Systems and Knowledge Discovery (FSKD). IEEE, 2010. http://dx.doi.org/10.1109/fskd.2010.5569344.

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Kalmar, Gyorgy. "Investigation of Reverse Mode Loudspeaker Performance in Urban Sound Classification." In 2019 27th European Signal Processing Conference (EUSIPCO). IEEE, 2019. http://dx.doi.org/10.23919/eusipco.2019.8903085.

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Izzo, A., C. Clemente, L. Ausiello, and J. J. Soraghan. "Radar based deep learning technology for loudspeaker faults detection and classification." In 2020 IEEE Radar Conference (RadarConf20). IEEE, 2020. http://dx.doi.org/10.1109/radarconf2043947.2020.9266409.

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