查询词典 noise-power-ratio

The modified algorithm estimates the AR model parameters according to the reverberation noise data of the previous blodk, uses the whitener constructed by estimated parameters to filter the reverberation noise data of the current block, and executes the univariate GLRT judgement to the filtered data.

改进算法根据前一段的混响噪声数据估计AR模型参数，利用估计参数构成的白化器对当前段混响噪声数据进行滤波，并对滤波后数据进行单变量的GLRT检测。

The modified algorithm estimates the AR model parameters according to the reverberation noise data of the previous blodk,uses the whitener constructed by estimated parameters to filter the reverberation noise data of the current block,and executes the univariate GLRT judgement to the filter...

改进算法根据前一段的混响噪声数据估计AR模型参数，利用估计参数构成的白化器对当前段混响噪声数据进行滤波，并对滤波后数据进行单变量的GLRT检测。与双变量的GLRT算法相比，改进算法有效降低了运算量。最后通过蒙特卡罗仿真给出了改进算法的检测性能分析。

The numerical analysis shows that the effect of an input sinusoidal signal is also a sinusoidal signal in the output, and the effect of the white noise is a Wiener process. When the system parameters are small enough, the effect of signal modulating noise can occur in the stochastic systems.

理论分析表明，正弦信号在系统输出中的数值表现仍为正弦信号，白噪声的效应是维纳过程，较小的系统参数才能使随机共振系统发生信号调制噪声效应。

By making a numerical analysis of the bistable stochastic dynamical systems, we find that the effect of an input sinusoidal signal is also a sinusoidal signal in the output, and the effect of the white noise is a Wiener process. When the system parameters are small enough, the coupling effect between the sinusoidal signal and the white noise can be largely weakened.

随机共振是双稳系统在周期信号和噪声的作用下表现出来的非线性现象，当系统的非线性与信号和噪声之间存在某种匹配时，通过对系统施加适当强度的噪声，可以提高系统对信号的响应，系统输出的信噪比对噪声强度表现出一峰状曲线[11] 。

Since the late eighties of the 20th century, active control of interior structure borne noise within enclosures using smart materials such as lead zirconate titanate pizeoelectric actuators, etc. has become a hot research area in the field of noise control.

二十世纪八十年代后期以来，利用压电陶瓷等智能材料进行封闭空间结构声辐射的有源消声成为噪声控制领域中的一个研究热点。

In this thesis, we introduce RF transceiver architectures for the wireless communication system and some parameters of the down-conversion mixer. By means of the noise model of RF-CMOS mixers presented by ABIDI in 2000, circuit designers will know how the noise appears at the output of a CMOS down-conversion mixer.

本篇论文介绍了无线通讯系统中常用的射频接收机系统架构及混频器的参数介绍外，并藉由ABIDI於2000年所提出CMOS混频器之杂讯模型，透过此模型将使电路设计者更清楚的了解到杂讯源将经由何种过程出现在混频器的输出端。

Most of previous segmentation approachs make use of the surface curvatures or the approximative polynomial coefficients which are very sensitive to noise, but the mathematical morphological operations are robust, so another main advantage of our scheme is its good noise immunity.

以前的大多数分割方法都使用表面的曲率或近似多项式的系数，表面的曲率或近似多项式的系数的计算对噪声很敏感，而数学形态学运算具有较好的抗噪声性，因此我们的方法的另外一个优点是它具有良好的抗噪声性能。

By analyzing the results of LSNR measurements for samples with different components, and comparing with the media of Aprilis Corporation, we give the suggestion to optimize the material components in the future. In addition, based on the physical mechanism of intra-page crosstalk noise, we proposed the Pixel-Matched Spread Function, and a simplified deconvolution arithmetic to suppress the intra-page crosstalk noise.

另外，在分析数字数据全息存储中页内串扰噪声产生的物理过程的基础上，提出了像元匹配扩散函数的概念，并提出了一个反卷积算法来抑制页内串扰噪声，计算机模拟和实验结果都证明我们提出的PMSF算法可以有效的抑制页内串扰噪声，提高恢复数据页的保真度。

This dissertation comprehensibly researches the performance of hybrid DS/FH spread spectrum communication systems, operating in a combined additive white gaussian noise , multiple access interference, and channel fading, particularly operating in hostile interference (partial band interference and multitone jamming). At the same time, the dissertation investigates performance of forward error correction coding and diversity technology against channel noise.

本文以此为背景，较为详细地研究了在信道中出现各种噪声干扰（高斯白噪声、多址干扰和信道衰落），特别是敌方的人为干扰（部分带宽噪声干扰和部分带宽多频干扰）时，混合DS/FH扩频通信系统的性能，以及前向纠错信道编码和分集技术对混合扩频通信系统信道出现噪声干扰时系统性能的改进情况。

The ordinary edge detection methods such as Sobel and Canny operators are immune to noise, which result in cophasal axes discontinuity due to lack of edge information caused by noise.

由于边缘检测中常用的Sobel算子和Canny算子检测同相轴时对噪声免疫差，常因噪声因素引起边缘信息缺失导致同相轴提取不连续，本文采用中值滤波并对Sobel算子进行改进，对地震剖面图进行预处理，结合均方差自动确定阈值并进行异常检测，提取完整同相轴。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。