نتایج جستجو برای: acoustic noise
تعداد نتایج: 271819 فیلتر نتایج به سال:
Magnetic resonance (MR) acoustic scanner noise may negatively affect the performanceof functional magnetic resonance imaging (±MRI), a problem that worsens at the higher field strengths proposed to enhance ±MRI. We present an overview of the current knowledge on theeffects of confounding acoustic MR noise in fMRI experiments. The principles and effectivenessof various methods to red...
This study assessed the acoustic and perceptual effect of noise on male/female speech. Acoustic analysis are carried out on the Hindi language female/male speaker. Various levels of noise ranging from 0 dB to 20 dB are added with the original recorded speech signal. An standard HNM parameters are used to synthesis the noise added signal. Perceptual experiments were also conducted to assess the ...
The project conducts application-oriented research on impacts of underwater noise on marine vertebrates in the North and Baltic Seas. In distinct subprojects, the hearing sensitivity of harbor porpoises and gray seals as well as the acoustic tolerance limit of harbor porpoises to impulsive noise from pile driving and stress reactions caused by anthropogenic noise is investigated. Animals are eq...
The generation of ultra-low frequency acoustic noise (0.1 to 1 Hz) by the nonlinear interaction of ocean surface gravity waves is well established. More controversial are the quantitative theories that attempt to predict the recorded noise levels and their variability. Here a single theoretical framework is used to predict the noise level associated with propagating pseudo-Rayleigh modes and ev...
Acoustic noise generated by vessel motion in the test range on a river is the subject of this paper. The hydroacoustic field of the vessel is analyzed using different methods. The analysis was performed in time and frequency domain. The acoustic signals are analyzed using classical concept of the spectral analysis, parametric models of random processes and bispectrum analysis. Particular intere...
With the increasing demand for wireless voice services and limited bandwidth resources, it is critical to develop and implement coding techniques which use spectrum efficiently. One approach to increasing system capacity is to lower the bit rate of telephone speech. A typical telephone conversation contains approximately 40% speech and 60% silence or background acoustic noise. A reduction of th...
This paper presents a new design to reduce torque ripple in Switched Reluctance Motors (SRM). Although SRM possesses many advantages in terms of motor structure, it suffers from large torque ripple that causes problems such as vibration and acoustic noise. The paper describes new rotor and stator pole shapes with a non-uniform air gap profile to reduce torque ripple while retaining its average ...
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