scholarly journals Development of the sound field visualization system "HISORP-M"

1986 ◽  
Vol 6 (22) ◽  
pp. 255-258
Author(s):  
YUKIJI IWASE
Keyword(s):  
Sound Field ◽  
Visualization System

Three-dimensional sound-field visualization system using head mounted display and stereo camera

2016 ◽  
Vol 140 (4) ◽  
pp. 3195-3196
Author(s):  
Atsuto Inoue ◽  
Yusuke Ikeda ◽  
Kohei Yatabe ◽  
Yasuhiro Oikawa
Keyword(s):  
Three Dimensional ◽  
Sound Field ◽  
Visualization System ◽  
Stereo Camera ◽  
Head Mounted Display

A sound field visualization system based on the wave superposition algorithm

2008 ◽  
Vol 222 (8) ◽  
pp. 1403-1412 ◽  
Author(s):  
J Q Li ◽  
J Chen ◽  
C Yang ◽  
G M Dong
Keyword(s):  
Numerical Simulations ◽  
Tikhonov Regularization ◽  
Sound Field ◽  
Point Sources ◽  
Experimental Results ◽  
Visualization System ◽  
Field Reconstruction ◽  
Wave Superposition ◽  
Sound Field Reconstruction ◽  
Regularization Strategy

Sound field visualization is a helpful design and analysis tool for the study of sound radiation and dispersion problems. It can help to comprehend deeply about noise transmission mechanism, monitor environment noise, evaluate sound quality, and even diagnose the machinery faults based on mechanical noise. The well-known near-field acoustic holography is an accurate sound field visualization technique. However, this technique has disadvantages such as strict measurement requirements and the need of an enormous number of microphones, which limits its extended applications. In order to visualize the sound field with a small number of microphones for measurements, the regeneration method of the radiated field by using the wave superposition algorithm is attempted in this study. It is based on the principle of equivalent source: the sound field radiated by an arbitrarily shaped radiator is substituted by the distributed point sources (monopole or dipole) constrained inside the actual source surface. For suppressing the adverse effect of measurement noise, the Tikhonov regularization strategy is adopted to work together with the wave superposition algorithm to give an accurate solution. Numerical simulations were performed based on a two-pulse-ball model to evaluate the accuracy of the combined algorithm of the wave superposition and the Tikhonov regularization strategy. In addition, an integrated sound field visualization system is designed and implemented. The functions include acoustic signal acquisition and processing, sound field reconstruction, and results visualization. The performance of the presented system was tested by experiments in a semi-anechoic chamber by using two sound boxes to simulate the sound sources. As concerning practical measurement microphones, there exist phase mismatches between the channels. Results will go wrong if the sound field reconstruction is performed directly with these uncalibrated measurement data. Therefore, a calibration procedure is applied to eliminate them. Experimental results indicate that the phase mismatches between the channels after calibration decay to 0.1°. Both the numerical simulations and experimental results accurately reconstructed the exterior sound field of the models. It is shown that the wave superposition algorithm together with the Tikhonov regularization strategy can exactly reconstruct the exterior sound field of radiators, which makes a base to its applications in practice. This sound field visualization system will make an operator's experimental work much easier.

scholarly journals Visualization system for sound field using see-through head-mounted display

2019 ◽  
Vol 40 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Atsuto Inoue ◽  
Yusuke Ikeda ◽  
Kohei Yatabe ◽  
Yasuhiro Oikawa
Keyword(s):  
Sound Field ◽  
Visualization System ◽  
Head Mounted Display

Sound Field Projection System using Optical See-Through Head Mounted Display

2021 ◽  
Vol 263 (5) ◽  
pp. 1267-1274
Author(s):  
Atsuto Inoue ◽  
Wataru Teraoka ◽  
Yasuhiro Oikawa ◽  
Takahiro Satou ◽  
Yasuyuki Iwane ◽  
...  
Keyword(s):  
Real Time ◽  
Virtual Worlds ◽  
Transmission Control Protocol ◽  
Microphone Array ◽  
Sound Field ◽  
Optical Methods ◽  
Beam Forming ◽  
Projection System ◽  
Visualization System ◽  
Head Mounted Display

There are various ways to grasp the spatial and temporal structures of sound field. Sound field visualization is an effective technique to understand spatial sound information. For example, acoustical holography, optical methods, and beam-forming have been proposed and studied. In recent years, augmented reality (AR) technology has rapidly developed and is now more familiar. Many sensors, display devices, and ICT technologies have been implemented in AR equipment, which enable interaction between real and virtual worlds. In this paper, we propose an AR display system, which displays the results obtained by the beam-forming method. The system consists of 16ch microphone array, real-time sound field visualization system and optical see-through head mounted display (OST-HMD). Real-time sound field visualization system analyses sound signals recorded by 16ch microphone array by beam-forming method. Processed sound pressures data are sent to OST-HMD by using transmission control protocol (TCP), and colormap is projected on real world. Settings property of real-time sound field visualization system can be changed by using virtual user interface (UI) and TCP. In addition, multi-users can experience the system by sharing sound pressures and settings property data. Using this system, users wearing OST-HMD can observe sound field information intuitively.

Decay of Temporary Threshold Shift in Noise

1973 ◽  
Vol 16 (2) ◽  
pp. 267-270 ◽  
Author(s):  
John H. Mills ◽  
Seija A. Talo ◽  
Gloria S. Gordon
Keyword(s):  
Sound Field ◽  
Threshold Shift ◽  
Temporary Threshold Shift ◽  
Octave Band ◽  
Band Noise ◽  
Lower Asymptote

Groups of monaural chinchillas trained in behavioral audiometry were exposed in a diffuse sound field to an octave-band noise centered at 4.0 k Hz. The growth of temporary threshold shift (TTS) at 5.7 k Hz from zero to an asymptote (TTS ∞ ) required about 24 hours, and the growth of TTS at 5.7 k Hz from an asymptote to a higher asymptote, about 12–24 hours. TTS ∞ can be described by the equation TTS ∞ = 1.6(SPL-A) where A = 47. These results are consistent with those previously reported in this journal by Carder and Miller and Mills and Talo. Whereas the decay of TTS ∞ to zero required about three days, the decay of TTS ∞ to a lower TTS ∞ required about three to seven days. The decay of TTS ∞ in noise, therefore, appears to require slightly more time than the decay of TTS ∞ in the quiet. However, for a given level of noise, the magnitude of TTS ∞ is the same regardless of whether the TTS asymptote is approached from zero, from a lower asymptote, or from a higher asymptote.

Modified Earpieces and CROS for High Frequency Hearing Losses

1968 ◽  
Vol 11 (1) ◽  
pp. 204-218 ◽  
Author(s):  
Elizabeth Dodds ◽  
Earl Harford
Keyword(s):  
Hearing Loss ◽  
Hearing Aids ◽  
High Frequency ◽  
Hearing Aid ◽  
Sound Field ◽  
Intensity Level ◽  
Test Results ◽  
High Frequency Hearing Loss ◽  
Increased Sensitivity ◽  
Difficult Cases

Persons with a high frequency hearing loss are difficult cases for whom to find suitable amplification. We have experienced some success with this problem in our Hearing Clinics using a specially designed earmold with a hearing aid. Thirty-five cases with high frequency hearing losses were selected from our clinical files for analysis of test results using standard, vented, and open earpieces. A statistical analysis of test results revealed that PB scores in sound field, using an average conversational intensity level (70 dB SPL), were enhanced when utilizing any one of the three earmolds. This result was due undoubtedly to increased sensitivity provided by the hearing aid. Only the open earmold used with a CROS hearing aid resulted in a significant improvement in discrimination when compared with the group’s unaided PB score under earphones or when comparing inter-earmold scores. These findings suggest that the inclusion of the open earmold with a CROS aid in the audiologist’s armamentarium should increase his flexibility in selecting hearing aids for persons with a high frequency hearing loss.

Sound Field Reproduction Using Ambisonics and Irregular Loudspeaker Arrays

2014 ◽  
Vol E97.A (9) ◽  
pp. 1832-1839 ◽  
Author(s):  
Jorge TREVINO ◽  
Takuma OKAMOTO ◽  
Yukio IWAYA ◽  
Yôiti SUZUKI
Keyword(s):  
Sound Field
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