Modulation cues influence binaural masking-level difference in masking-pattern experiments
Marc Nitschmann and Jesko L. Verhey
Binaural masking patterns show a steep decrease in the binaural masking-level difference (BMLD) when masker and signal have no frequency component in common. Experimental threshold data are presented together with model simulations for a diotic masker centered at 250 or 500 Hz and a bandwidth of 10 ... [J. Acoust. Soc. Am. 131, EL223 (2012)] published Thu Feb 9, 2012.
A potential role for noise complaints as a predictor of the prevalence of annoyance with aircraft noise
Sanford Fidell, Vincent Mestre, and Matthew Sneddon
Aircraft noise complaints lodged with airports are regarded for U.S. federal policy purposes as unreliable and uninterpretable indications of noise impacts on airport-area communities. Small numbers of complainants are typically responsible for large numbers of complaints; the bulk of complaints are ... [Noise Control Eng. J. 60, 62 (2012)] published Wed Feb 8, 2012.
Low frequency noise absorption by helium-filled duct lining
Y. S. Choy
Low-frequency noise is hard to tackle by traditional sound absorption material because of its inherent high acoustic impedance and space limitation for installing such material. There is a significant sound reflection at the air-absorber interface due to the high impedance mismatch with ambient air ... [Noise Control Eng. J. 60, 9 (2012)] published Wed Feb 8, 2012.
Real-time experiments of ANC systems for infant incubators
Lichuan Liu, Kaplia Beemanpally, and Sen M. Kuo
This paper presents real-time experiments of applying active noise control (ANC) algorithms for infant incubators to reduce recorded neonatal intensive care unit (NICU) noise. Research shows that 1015% of newborns spend time in NICU and high noise levels in the infant incubator result in numerous ad ... [Noise Control Eng. J. 60, 36 (2012)] published Wed Feb 8, 2012.
Acoustic testing facilities at the Office of Mine Safety and Health Research
J. Shawn Peterson, David Yantek, and Adam K. Smith
The National Institute for Occupational Safety and Health (NIOSH) Office of Mine Safety and Health Research (OMSHR) maintains a noise control program as part of its Hearing Loss Prevention Branch (HLPB). This program utilizes two large acoustic laboratoriesa reverberation chamber and a hemi-anechoic ... [Noise Control Eng. J. 60, 85 (2012)] published Wed Feb 8, 2012.
The effect of time on the contribution of asphalt rubber mixtures to noise abatement
Elisabete F. Freitas
Road pavement surface layers incorporating rubberized asphalt binders have recently been recommended as a measure to mitigate noise. At first their acoustical performance seems to be superior to that shown by conventional layers. Nevertheless, the knowledge in relation to their behavior throughout t ... [Noise Control Eng. J. 60, 1 (2012)] published Wed Feb 8, 2012.
Online urban acoustic noise monitoring system
Andrzej Czyzewski, Jozef Kotus, and Maciej Szczodrak
Concepts and implementation of the Online Urban Noise Monitoring System are presented. Principles of proposed solution used for dynamic acoustical maps creating are discussed. The architecture of the system and the data acquisition scheme are described. The concept of noise mapping, based on noise s ... [Noise Control Eng. J. 60, 69 (2012)] published Wed Feb 8, 2012.
A hybrid finite element-least square point interpolation method for solving acoustic problems
L. Y. Yao, D. J. Yu, W. Y. Cui, and J. W. Zhou
This paper presents a finite element-least square point interpolation method (FE-LSPIM) for solving 2D acoustic problem by synthesizing the attractive features of finite element and least-square point interpolation shape functions using the concepts of partition of unity (PU) methods. In the present ... [Noise Control Eng. J. 60, 97 (2012)] published Wed Feb 8, 2012.
The mechanical properties of earmuffs
W. Williams, M. Seeto, and H. Dillon
The physical properties of circum-aural hearing protectors, such as mass, clamping force and cup volume, have an influence on the attenuation performance of the device. This paper closely examines the physical and acoustic properties 39 of hearing protectors readily available to all users. The resul ... [Noise Control Eng. J. 60, 29 (2012)] published Wed Feb 8, 2012.
Uncertainty minimization in L measurements
Rufin Makarewicz and Roman Golebiewski
Usually, the time-term average sound level, L, is not directly measured but calculated from the measured sound exposure levels. Variance of L,….., L quantifies the uncertainty of noise measurements. In any case, a decrease in the variance means an increase in the quality of measurements. This ... [Noise Control Eng. J. 60, 121 (2012)] published Wed Feb 8, 2012.
A hybrid acoustic holography technique for moving sound source identification based on wave superposition algorithm
Diange Yang, Ziteng Wang, Bing Li, and Xiaomin Lian
To solve the ghost sources problem which occurs in the noise source identification, a hybrid acoustic holography technique based on wave superposition method is developed in our current work. This research extended the wave superposition method to the measurement of the moving sound sources and solv ... [Noise Control Eng. J. 60, 113 (2012)] published Wed Feb 8, 2012.
An experimental study on a cylindrical microperforated panel space sound absorber
Kimihiro Sakagami, Takayuki Oshitani, Motoki Yairi, Emi Toyoda, and Masayuki Morimoto
A microperforated panel (MPP), which is widely known as one of the most promising alternatives of the next-generation sound absorbers, is typically used with a rigid-back wall with an air-cavity. However, a multiple-leaf MPP space absorber, which does not have any backing structure, double-leaf MPP ... [Noise Control Eng. J. 60, 22 (2012)] published Wed Feb 8, 2012.
A combined sonic crystal rod of Bragg type with ability of vibration reduction in broad frequency band
Haisheng Shu, Shaogang Liu, Dan Zhao, Fa Zhang, and Enwu Gao
One dimensional sonic crystal (SC) rod has apparent band gaps in which longitudinal wave and bending wave can be suppressed distinctly. However, each single SC rod's band gap width is comparatively narrow and the low frequency vibration cannot be reduced generally. For this reason, a combined SC rod ... [Noise Control Eng. J. 60, 42 (2012)] published Wed Feb 8, 2012.
Complement to standard method for measuring normal incidence sound transmission loss with three microphones
Yacoubou Salissou, Raymond Panneton, and Olivier Doutres
Complement to standard E2611-09 of the American Society for Testing and Materials [Standard Test Method for Measurement of Normal Incidence Sound Transmission of Acoustical Materials Based on the Transfer Matrix Method (American Society for Testing and Materials, New York, 2009)] is proposed in orde ... [J. Acoust. Soc. Am. 131, EL216 (2012)] published Wed Feb 8, 2012.
Acoustically-observable properties of adult gait
Marshall Bradley and James M. Sabatier
An approach has been developed for extracting human gait parameters from micro Doppler sonar grams. Key parameters include average speed of walking, torso velocity, walk cycle time, and peak leg velocity. The approach is a modification of a technique previously used in radar data analysis. It has be ... [J. Acoust. Soc. Am. 131, EL210 (2012)] published Wed Feb 8, 2012.
Aerial ultrasonic micro Doppler sonar detection range in outdoor environments
Marshall Bradley and James M. Sabatier
Current research demonstrates that micro Doppler sonar has the capability to uniquely identify the presence of a moving human, making it an attractive component in surveillance systems for border security applications. Primary environmental factors that limit sonar performance are two-way spreading ... [J. Acoust. Soc. Am. 131, EL203 (2012)] published Wed Feb 8, 2012.
Analysis of acoustic parameters for consonant voicing classification in clean and telephone speech
Suk-Myung Lee and Jeung-Yoon Choi
This paper describes acoustic cues for classification of consonant voicing in a distinctive feature-based speech recognition system. Initial acoustic cues are selected by studying consonant production mechanisms. Spectral representations, band-limited energies, and correlation values, along with Mel ... [J. Acoust. Soc. Am. 131, EL197 (2012)] published Wed Feb 8, 2012.
Comment on Design of acoustic devices with isotropic material via conformal transformation [Appl. Phys. Lett. 97, 044101 (2010)]
Andrew N. Norris
Abstract not available. [Appl. Phys. Lett. 100, 066101 (2012)] published Mon Feb 6, 2012.
Response to Comment on `Design of acoustic devices with isotropic material via conformal transformation' [Appl. Phys. Lett. 100, 066101 (2012)]
Zhihai Xiang, Chunyu Ren, and Zhangzhi Cen
Abstract not available. [Appl. Phys. Lett. 100, 066102 (2012)] published Mon Feb 6, 2012.
Sound absorption of different green roof systems
Ilaria Pittaluga, Corrado Schenone, and Davide Borelli
Experimental data on acoustical performances, in particular on sound absorption of several green roof systems were evaluated and discussed. Measurements were performed on samples of three green roof systems, different for maintenance, plant setting and containment criteria, and categorized in extens ... [POMA 14, 015005 (2012)] published Wed Feb 1, 2012.
Optimal spatiotemporal focusing through complex scattering media
Jochen Aulbach, Alice Bretagne, Mathias Fink, Mickael Tanter, and Arnaud Tourin
We present an alternative approach for spatiotemporal focusing through complex scattering media by wave front shaping. Using a nonlinear feedback signal to shape the incident pulsed wave front, we show that the limit of a spatiotemporal matched filter can be achieved; i.e., the wave amplitude at the ... [Phys. Rev. E 85, 016605 ] published .