噪

The simulations show that in the same estimation accuracy SNR required by the no vel method is 5dB lower than that ...

仿真实验表明，在相同精度的条件下文中提出的新方法较之改进KT法和基于四阶累量方法需要的信噪比降低了5dB。

Laser Doppler Velocimeter is adapted to measure the velocity distribution of the flow field. A new forward-scattering setup is adapted to improve the signal noise ratio which is reduced by the flame. Distribution of the velocity was measured.

介绍了激光多普勒测速方法及其在火焰测量中的特殊应用技术，针对燃烧中多普勒信号信噪比低的特点，建立了新的前向散射系统，取得了良好的效果。

In order to decrease the measuring error of signal processing in laser Doppler velocimeter,frequency spectrum correction methods for laser Doppler signal were proposed.

在激光多普勒测速仪中，为了减小由信号处理算法带来的测量误差，提出运用频谱校正算法对多普勒信号的频谱进行校正，详细阐述了能量重心法、比值法和相位差法3种离散频谱校正算法的基本原理，运用这3种算法对理想正弦信号进行仿真，并运用比值法对信号施加不同频率和信噪比的噪音下的正弦信号和实测的多普勒信号进行仿真及实验研究。

The effect of SBS and vermiculite on damping property was analysized.

结合正交试验法研究了主要影响因素对阻尼性能的影响，并进行了实际降噪模拟测试。

First, we carry on the pretreatment to the original license plate image; then,detect the car licence edge with one anti-chirp mathematics morphology edge detection operator; finally, remove the horizontal noise of car licence mage and union horizontal, vertical positioning projection for locating the car licence.

首先，对原始车牌图像进行预处理；然后，利用一种抗噪型数学形态学边缘检测算子进行车牌边缘检测；最后，去除图像水平噪声，结合水平、垂直投影进行定位。

So, it is of great importance to reduce its vibration and noise.

因此，对该系统进行减振降噪研究具有重要的军事意义。

Perhaps the best way to create an accurate picture of Artimis is to tell the by now famous account of his first villainous venture.

或许，他首次的恶作剧冒险经历报告书可以让大家最好地了解他是怎样的一个人，那可是一次到目前为止声名大噪的经历。

He is famous for traveling 29,000 miles in Africa during the 19th century.Ve discovered many vivers, likes and mountains,in clubing the Victoria Falls,the biggest water fall in the worlk.More of all,he is highly respected because he happed to a bolish slave trade in Africa.

他于19世纪在非洲旅行了29000英里而声名大噪，他发现了许多河流、湖泊和山峦，包括世界上最大的瀑布--维多利亚瀑布，更重要的是，他促成废除非洲的奴隶买卖而逢受尊敬。

This paper introduces the research and implementation of all-purpose high-speed test adapter for ADC. The main contents includes two methods about how to testing the static parameters and dynamic parameters for ADC. The servo loop method is proposed to static parameters, by using the test principle of high-precision voltage source, high-precision voltage meter and digital comparator. To dynamic parameters, the DDS chip of AD9851 is used to generate sine waves with high signal to noise ratio, then the high-s...

servo loop ； FFT ；本文介绍了关于ADC高速通用测试适配器的研究和实现，主要介绍了测试ADC芯片静态参数和动态参数两种方法，针对静态参数，提出了用伺服环的方法，采用高精度电压源，高精度电压表和数字比较器的测试原理；针对动态参数，提出了用DDS芯片AD9851产生高信噪比的正弦波，采用高速采样模块采集数据，最后用FFT算法对采集的数据进行处理。

In order to emulate and evaluate the system performance, the signal-to-noise and probability of detection vs. the gain and threshold voltage of APD arrays were discussed in this paper.

为了仿真评估系统的性能，主要分析了APD阵列增益对系统信噪比和探测概率的影响，APD阵列的阈值电压对系统探测概率的影响。

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％。