1,720,955 research outputs found
Ideal focusing and optimally-conditioned systems in sound field control with loudspeaker arrays
No full textThe focusing operation inherent to sound field control based on inverse filters is a fundamental aspect of the overall sound field reproduction that completely determines the system robustness and stability. The behaviour of the system is fundamentally tied to the amount of acoustic crosstalk at each control point that manifests as a result of the focus- ing operation. The maximisation of the crosstalk at just one point in space leads to linear dependence in the plant matrix and system instability. On the other hand, its minimisation leads to the ideal focusing state, wherein the sources can selectively focus at each point while a null is created at all other points. Two theoretical case studies are presented that demonstrate ideal and super ideal focusing, wherein the latter the plant matrix is optimally-conditioned. First, the application of binaural audio reproduction using an array of loudspeakers is examined and cases of ideal focusing are presented. In the process, the Optimal Source Distribution is re-derived and shown to be a specific case of super ideal focusing. Secondly, the application of recreating multiple sound zones using a linear array is examined and the conditions to achieve super ideal focusing at control points angled arbitrarily in the far-field are derived. In all cases, the ability to maintain ideal focusing as a function of frequency requires proportional changes in the source or control point geometry
Dataset for A Compact Two-Loudspeaker Virtual Sound Reproduction System for Clinical Testing of Spatial Hearing With Hearing-Assistive Devices
No full textDataset for A Compact Two-Loudspeaker Virtual Sound Reproduction System for Clinical Testing of Spatial Hearing With Hearing-Assistive Devices
Dataset DOI: https://doi.org/10.5258/SOTON/D2081
Authors: Eric Hamdan & Mark Fletcher, Auditory Implant Service, University of Southampton
This dataset supports the publication:
AUTHORS: Eric Hamdan and Mark Fletcher
TITLE: A Compact Two-Loudspeaker Virtual Sound Reproduction System for Clinical Testing of Spatial Hearing With Hearing-Assistive Devices
JOURNAL: Frontiers in Neuroscience
This dataset contains CSV files for each figure in the manuscript that has graphed data, i.e., Figures 4 - 15. The CSV files contain the x,y data for each graph (some graphs have multiple dependent variables, e.g., y1, y2, etc.). There is a folder for each figure which contains the corresponding CVS file, e.g.,
Figure5/Figure_5.csv
For figures with subfigures, i.e., (A), (B), etc., there is a CSV file for each subfigure, e.g.,
Figure7/Figure_7A.csv
Figure7/Figure_7B.csv
Figures 14A,B and 15A,B feature 2D graphs, i.e., color maps. The two independent variables are head rotation angle (degrees) and frequency (Hz). For these subfigures, there is a CSV file for each head rotation angle, e.g.,
Figure15/Figure_15A_Angle-10.csv -> corresponds to a head rotation angle of -10 degrees
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Figure15/Figure_15A_Angle00.csv -> corresponds to a head rotation angle of 0 degrees
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Figure15/Figure_15A_Angle10.csv -> corresponds to a head rotation angle of 10 degrees
Additionally, the folders LAC_AE/ and Booth_AE/ contain the CSV files for the smoothed absolute error (AE) associated with Figures 14 and 15 (corresponding to the large anechoic chamber (LAC) and the audiological booth). There is a CSV file for the AE calculated for each head rotation angle (as done with Figures 14A,B and 15A,B), and with and without filter compensation for the head rotation. CSV files for data with head rotation compensation are denoted with "LACC" or "BC". CSV files for data with no head rotation compensation are denoted with "LACNC" and "BNC", e.g.
LAC_AE/LACC_AEhat_Angle00.csv -> corresponds to a head rotation angle of 0 degrees, in the LAC, with head rotation compensation
LAC_AE/LACNC_AEhat_Angle00.csv -> corresponds to a head rotation angle of 0 degrees, in the LAC, no head rotation compensation
Booth_AE/BC_AEhat_Angle00.csv -> corresponds to a head rotation angle of 0 degrees, in the booth, with head rotation compensation
Booth_AE/BNC_AEhat_Angle00.csv -> corresponds to a head rotation angle of 0 degrees, in the booth, no head rotation compensation
Finally, there are stereo HAD recordings of a target speech recording played from each of the six loudspeakers used in the experiment (L3, L2, L1, R1, R2, R3) and recordings of the VA system (L1 and R1) attempting to reproduce the target signal, as detailed in section Results->Stationary Measurements of the manuscript. Recordings were made in the LAC and audiological booth. The LAC and booth recordings are in the folders HAD_Recordings/LAC and HAD_Recordings/Booth, respectively. The target recordings are denoted with the letter 'd' and the reproduced recordings are denoted with the letter 'p', e.g.,
HAD_Recordings/LAC/LAC_d_L1.wav -> recording of the target speech played from loudspeaker L1 in the LAC
HAD_Recordings/LAC/LAC_p_L1.wav -> recording of the VA system reproduced speech played from loudspeaker L1 in the LAC
HAD_Recordings/Booth/Booth_d_L1.wav -> recording of the target speech played from loudspeaker L1 in the audiological booth
HAD_Recordings/Booth/Booth_p_L1.wav -> recording of the VA system reproduced speech played from loudspeaker L1 in the audiological booth
Date of data collection: 09/09/2020 - 29/01/2021
All data was collected at the University of Southampton, U.K.</span
Stage compression in transaural audio
No full textThe reproduction of binaural audio with loudspeakers, also referred to as transaural audio, is affected by a number of artefacts. This work focuses on the effect of reproduction error on low frequency Interaural Time Difference (ITD). Transaural systems do not provide perfect cross-talk cancellation between the left and right ear signals, especially at low frequencies. It is shown that increase in cross-talk leads to a perceived source azimuth angle that is smaller than intended. The authors show that in ideal theoretical conditions the angular error calculated from the interaural phase difference indicates stage compression for frequencies for which high cross-talk occurs. This trend is shown in the resultant ITD calculated from Interaural Cross Correlation (IACC), examined in one-third octave bands.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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