scholarly journals The influence of vision on the absolute identification of sound-source position

1980 ◽  
Vol 28 (6) ◽  
pp. 589-596 ◽  
Author(s):  
B. R. Shelton ◽  
C. L. Searle
Keyword(s):  
Sound Source ◽  
Source Position ◽  
Absolute Identification ◽  
The Absolute

Optimization of the Sound Source Position for Shaping Acoustically-Structurally Coupled Cavities

2001 ◽  
Author(s):  
Arzu Gonenc Sorguc ◽  
Ichiro Hagiwara ◽  
Qinzhong Shi ◽  
Haldun Akagunduz
Keyword(s):  
Sound Source ◽  
Sequential Quadratic Programming ◽  
Normal Modes ◽  
Sound Field ◽  
Source Strength ◽  
Source Position ◽  
Sound Sources ◽  
Coupled Cavities ◽  
Structural Loading ◽  
Initial Starting

Abstract In this study, sound field inside acoustically-structurally coupled rectangular cavity excited by structural loading and sound sources is shaped by optimizing the position of the sound source. In the optimization, Most Probable Optimal Design (MPOD) based on Holographic Neural Network is employed and the results are compared with Sequential Quadratic Programming (SQP). It is shown that source position, rather than source strength, is more effective in acoustically controlled modes. The nodal positions for in-vacuo acoustical normal modes are good candidates for initial starting points.

1101 Study of Acoustic Resonance Phenomena Including Sound Source Position

2013 ◽  
Vol 2013 (0) ◽  
pp. _1101-01_-_1101-04_
Author(s):  
Fumio SHIMIZU ◽  
Junichiro TAMAO ◽  
Kazuhiro TANAKA
Keyword(s):  
Sound Source ◽  
Acoustic Resonance ◽  
Source Position ◽  
Resonance Phenomena

Acuity of Sound Localisation: A Topography of Auditory Space. II. Pinna Cues Absent

Perception ◽  
1984 ◽  
Vol 13 (5) ◽  
pp. 601-617 ◽  
Author(s):  
Simon R Oldfield ◽  
Simon P A Parker
Keyword(s):  
White Noise ◽  
Sound Source ◽  
Normal Hearing ◽  
Auditory Space ◽  
Sound Localisation ◽  
Access Hole ◽  
The Absolute

The acuity of azimuth and elevation discrimination was measured under conditions in which the cues to localisation provided by the pinnae were removed. Four subjects localised a sound source (white noise through a speaker) which varied in position over a range of elevations (-40° to +40°) and azimuths (0° to 180°), at 10° intervals, on the left side of the head. Pinna cues were removed by the insertion of individually cast moulds in both pinnae. Each mould had an access hole to the auditory canal. The absolute and algebraic, azimuth and elevation errors were measured for all subjects at each position of the source. The variability of azimuth and elevation error was also computed. The performance of the subjects was compared to their performance under normal hearing conditions. Insertion of the pinnae moulds was found to increase substantially elevation error and the number of front/back reversals. The importance of the cues provided by the pinnae in these discriminations was thus confirmed. However, the increase in elevation error did not result in a corresponding increase in azimuth error. These findings provide support for the proposition that azimuth and elevation discrimination are coded independently.

scholarly journals Application of Short Time Fourier Transform and Wavelet Transform for Sound Source Localization Using Single Moving Microphone in Machine Condition Monitoring

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Meifal Rusli
Keyword(s):  
Fourier Transform ◽  
Wavelet Transform ◽  
Sound Source ◽  
Low Frequency ◽  
Peak Position ◽  
Source Position ◽  
Short Time Fourier Transform ◽  
Sound Sources ◽  
Time Frequency ◽  
Short Time

<p class="TTPParagraphothers"><em>The paper discusses means to predict sound source position emitted by fault machine components based on a single microphone moving in a linear track with constant speed.</em> The position of sound source that consists of some frequency spectrum is detected by time-frequency distribution of the sound signal through Short Time Fourier Transform (STFT) and Continues Wavelet Transform (CWT). <em>As the amplitude of sound pressure increases when the microphone moves closer, the source position and frequency are predicted from the peaks of time-frequency contour map</em><em>. </em>Firstly, numerical simulation is conducted using two sound sources that generate four different frequencies of sound. The second case is experimental analysis using rotating machine being monitored with unbalanced, misalignment and bearing defect. The result shows that application of both STFT and CWT are able to detect multiple sound sources position with multiple frequency peaks caused by machine fault. The STFT can indicate the frequency very clearly, but not for the peak position. On the other hand, the CWT is able to predict the position of sound at low frequency very clearly. However, it is failed to detect the exact frequency because of overlapping.</p>

Is measured channel capacity limited by the absolute identification paradigm?

1991 ◽  
Author(s):  
Kenneth A. Deffenbacher ◽  
Francis J. Clark ◽  
M. Elizabeth Davis ◽  
Konney J. Larwood
Keyword(s):  
Channel Capacity ◽  
Absolute Identification ◽  
The Absolute

scholarly journals Information About Sound Source Position and Sound Localization: People With Unilateral Hearing Impairment

2006 ◽  
Vol 43 (6) ◽  
pp. 529-540
Author(s):  
Yuko KOBAYASHI ◽  
Tsuneo HARASHIMA ◽  
Hirohide YOSHIOKA ◽  
Akiyoshi KATADA
Keyword(s):  
Hearing Impairment ◽  
Sound Localization ◽  
Sound Source ◽  
Source Position

scholarly journals Dependence of auditory spatial updating on vestibular, proprioceptive, and efference copy signals

2016 ◽  
Vol 116 (2) ◽  
pp. 765-775 ◽  
Author(s):  
Daria Genzel ◽  
Uwe Firzlaff ◽  
Lutz Wiegrebe ◽  
Paul R. MacNeilage
Keyword(s):  
Sound Source ◽  
Head Movement ◽  
Head Rotation ◽  
Efference Copy ◽  
The Body ◽  
Spatial Updating ◽  
Source Position ◽  
Passive Condition ◽  
The World ◽  
Active Condition

Humans localize sounds by comparing inputs across the two ears, resulting in a head-centered representation of sound-source position. When the head moves, information about head movement must be combined with the head-centered estimate to correctly update the world-centered sound-source position. Spatial updating has been extensively studied in the visual system, but less is known about how head movement signals interact with binaural information during auditory spatial updating. In the current experiments, listeners compared the world-centered azimuthal position of two sound sources presented before and after a head rotation that depended on condition. In the active condition, subjects rotated their head by ∼35° to the left or right, following a pretrained trajectory. In the passive condition, subjects were rotated along the same trajectory in a rotating chair. In the cancellation condition, subjects rotated their head as in the active condition, but the chair was counter-rotated on the basis of head-tracking data such that the head effectively remained fixed in space while the body rotated beneath it. Subjects updated most accurately in the passive condition but erred in the active and cancellation conditions. Performance is interpreted as reflecting the accuracy of perceived head rotation across conditions, which is modeled as a linear combination of proprioceptive/efference copy signals and vestibular signals. Resulting weights suggest that auditory updating is dominated by vestibular signals but with significant contributions from proprioception/efference copy. Overall, results shed light on the interplay of sensory and motor signals that determine the accuracy of auditory spatial updating.

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