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reflected noise
相关语句
  反射噪声
     Research of Reflected Noise in Digital System
     数字系统中的反射噪声研究
短句来源
  相似匹配句对
     Noise
     噪声的危害与控制
短句来源
     NOISE
     噪音
短句来源
     Research of Reflected Noise in Digital System
     数字系统中的反射噪声研究
短句来源
     Noise in signal was expressed by the partial mode, and signal frequency component was reflected by other modes.
     模态中的一部分表示了信号中的噪声,而剩下的部分模态真实反映了信号的频率成分.
短句来源
     THE ANALYSIS OF REFLECTED WAVES
     反射横波的震相分析
短句来源
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  reflected noise
This action prevents a build up of sound in enclosed spaces and reduces the strength of reflected noise.
      


By means of the theory analysis and test measure of the several chara-cterestics of pneumatic rock drill noise, in the paper, the principal noise sources of the rock drill are revealed which include ejecting-gas noise, stricking noise when piston impuses skank, mechanical noise and the rock reflecting noise. And the noise reducing ways and noisd noise-controlling means of every noise are studied. To reduce the ejecting-gas noise, a new way called "off-line...

By means of the theory analysis and test measure of the several chara-cterestics of pneumatic rock drill noise, in the paper, the principal noise sources of the rock drill are revealed which include ejecting-gas noise, stricking noise when piston impuses skank, mechanical noise and the rock reflecting noise. And the noise reducing ways and noisd noise-controlling means of every noise are studied. To reduce the ejecting-gas noise, a new way called "off-line operating" is put forward.

本文对风动凿岩机噪声的各种特性进行了理论分析和试验测试。结果表明,风动凿岩机的主要噪声源有:排气噪声、撞击噪声、机体振体的机械噪声、岩石的反射噪声。据此,本文提出了对各种噪声的降噪途径和控制方法,特别对排气噪声,提出了离机操作的新的降噪途径。

In many applications, such as reduction of the reflected noise of highway traffic, active surface of sound absorption is highly useful. But research is still very limited, hampering its widespread use. In order to make theory more useful to engineers, we generalize it in two aspects: (1) the incident sound wave may be oblique, i.e., not limited to being normal to active surface; (2) our theory can be applied to different media (air, water, oil). Fig.1 shows a rectangular parallelepiped, where the top...

In many applications, such as reduction of the reflected noise of highway traffic, active surface of sound absorption is highly useful. But research is still very limited, hampering its widespread use. In order to make theory more useful to engineers, we generalize it in two aspects: (1) the incident sound wave may be oblique, i.e., not limited to being normal to active surface; (2) our theory can be applied to different media (air, water, oil). Fig.1 shows a rectangular parallelepiped, where the top flexible plate is the active surface, and the other five rigid sides support the active surface and contain the medium. We excite the active surface with controllable secondary force sources. Eq.(7) gives the reflected acoustic power for the cavity structural coupling system. Minimizing eq.(7), I obtain the optimum reduction achievable with control. The calculated solid curve in Fig.3 shows the variation of reflected sound power with frequency before control and the calculated dotted curve, the variation after control. Fig.4 shows the calculated sound reductions for various locations of secondary exciting force source.

提出一种可用于吸收低频斜入射声波的有源吸声结构。文中描述了吸声层的组成形式,然后建立理论模型,按近场方法推导了有源控制前后反射声功率的计算公式,而后按声反射功率最小化准则求得最优次级力源复强度。最后通过计算机仿真证明了该吸声层吸收低频声波的有效性,并研究了吸声效果与次级力源位置的关系。

A kind of method for de-noising and improving signal noise ratio in railway signals transmission by wavelet transform is introduced,viz.,by using the specialties of wavelet transform,low-entropy,multi-resolution and de-correlation,etc,to high pass filter and low pass filter the railway signals and noise signals at the same time.Its high frequency coefficient reflects signal information mostly,and low frequency coefficient reflects noise signals and signal's detail information.This paper...

A kind of method for de-noising and improving signal noise ratio in railway signals transmission by wavelet transform is introduced,viz.,by using the specialties of wavelet transform,low-entropy,multi-resolution and de-correlation,etc,to high pass filter and low pass filter the railway signals and noise signals at the same time.Its high frequency coefficient reflects signal information mostly,and low frequency coefficient reflects noise signals and signal's detail information.This paper also gives multi-level wavelet transform analysis for non-calm railway noisy signals.and threshold processing high frequency decomposition coefficients for each level,then synthesize them,filtered the noises and saved the signal's high frequency information effectively.

介绍了一种在铁路机车信号传输过程中,用小波变换的方法降低噪声干扰和提高信号通道信号信噪比的方法,即用小波变换具有低熵性、多分辨率、去相关性和选基灵活性的特点,综合作为特征提取和低通滤波功能的手段,对机车信号和噪声干扰信号同时进行低通滤波和高通滤波,其低频系数主要反映信号信息,高频系数主要反映噪声和信号的细节信息.对非平稳机车含噪信号进行多层小波分析,对每层高频分解系数进行阈值处理后再合成,作为有效达到滤除噪声和保留信号高频信息的手段,对其进行了仿真分析.

 
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