查询词典 Signal-to-Noise

Computer calculations of the dependance of correlation output on the amplitudes of reference signal、write signal、read signal and duration of write signal were given.

计算了相关输出与参考信号、写信号及读信号幅度的关系，以及相关输出与写信号持续时间的关系。

The reference clock signal RCLK leads the feedback clock signal FCLK, generating a series of pulses in the DN signal and longer pulses in the UP signal.

在图3中，基准时钟信号RCLK引导反馈时钟信号FCLK，在DN信号中生成系列脉冲，在UP信号中生成较长的脉冲。

In this dissertation, digital lock-in detection techniques under integer period sampling and non-integer period sampling are separately investigated (1) Under integer period sampling, digital signal sequence is acquired through sampling the measured signal, but digital reference sequence is acquired through mathematical operation, then digital lock-in detection can be realized by calculating crosscorrelation function of digital signal sequence and digital reference sequence Harmonic measure is also analyzed, and a method of measuring harmonic of a periodic signal under aliasing is put forward.

本文对使用采样ADC把模拟信号转换为数字信号并通过计算数字信号的相关函数来实现锁定检测的技术进行了研究，在此基础上设计了一个多功能的数字LIA并在一些科学实验中进行了应用。本文对整周期采样和非整周期采样时的数字锁定检测技术分别进行了研究。(1)在整周期采样时，对被测信号进行采样得到信号序列，而参考序列由数学运算得到，通过计算信号序列和参考序列的互相关函数就可实现锁定检测。

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公司主要生产的空气呼吸器，正压式空气呼吸器，紧急逃生呼吸器装置|EEBD，船用油水分离器|船用油水分离器装置|船用舱底油污水分离器装置，船用消防员装备|消防员装备，正压式空气呼吸器备用气瓶，船用灭火器，PQ8.C型手提式空气泡沫枪装置，国际通岸接头，消防隔热服|隔热服，消防防化服，多用水枪，耐火绳|耐火救生绳，防爆灯，静水压力释放器，保温用具，救生衣，保温救生服，救生圈，救生衣灯，救生圈灯，救生筏灯，救生筏架，船用油水分离器装置，船用红色火焰信号，船用橙色烟雾信号，救生圈自亮浮灯烟雾信号，救生圈用橙色烟雾信号，船用抛绳设备，船用救生抛绳器，船用油水分离器装置等产品。

Optical signal that the receiver receives , shaking the light wave produced with the receiver , on terms that meet the phase place and match and the amplitude is matched, mix it frequently , output the square of intermediate frequency signal electric current in direct radio of sum of the intensity of optical signal produced with optical signal , and receiver .

接收机接收到的光信号、与接收机内部振荡所产生的光波，在满足相位匹配和振幅匹配的条件下，进行混频，输出与光信号、和接收机产生之光信号强度之和的平方成正比的中频信号电流。

The microseism signal automatic recognition system can pick up and analysis P wave 、S wave and the interfering signal in the microseism signal caused by the mining tremor, determine the time of signal arrival and amplitude, energy etc.

矿山微震信号自动识别系统可以对由矿震所引发的微震信号进行拾取并分析P波、S波及干扰信号，确定信号到时及振幅、能量等微震属性，为预测和防治矿震灾害提供了必要参数。

This thesis is focus on the detection and processing of fluorescence signal based on TRFIA, the signal includes single signal and multidrop signal which is biological chip.

首先分析了荧光信号产生的机理，在此基础上考虑到荧光信号十分微弱的特点和在强噪声背景环境下检测，设计了基于数字BOXCAR的信号检测系统。

It is found that the change of the frequency characteristics of chaotic system occurs mainly at the frequency band of the chaotic system, in which the input signal exists. The amplitude of the input signal doesn't influence the distortion of the output signal when masking signal is extracted by Oppenheim's chaotic masking.

研究发现，混沌系统频率特性的变化主要发生在输入信号的频率位於混沌系统频带内的情况下；输入信号幅度的大小，不影响输出信号的失真。

Results Metaphysis osteoporosis was observed on X-ray and CT in acute stage, the midsection of infarct of bone was isointensity on T1WI and iso/hyperintensity signal on T2WI, the edge of infarct of bone was ring-shaped hypointensity on T1WI and hyperintensity signal on T2WI. Small worm-eaten change and stippled calcification was observed on X-ray and CT in subacute stage, the infarct of bone was iso/hypointensity on T1WI and iso/hyperintensity signal on T2WI, the edge of infarct of bone was ring-shaped hypointensity on T1WI and hyperintensity signal on T2WI. Irregular and wriggle osteosclerosis was observed on X-ray and CT in chronic stage, was hypointensity on T1WI and T2WI.

结果 骨梗死急性期X线、CT表现为干骺端骨质疏松，MR T1WI骨梗死灶中央部分呈等至高信号，T2WI呈高信号，T1WI骨梗死灶边缘呈环形低信号，T2WI呈环形高信号；亚急性期X线、CT表现为小的虫噬样改变，伴有斑点状钙化，MR T1WI骨梗死灶呈等或低信号，T2WI呈等或稍高信号，T1WI骨梗死灶边缘呈环形低信号，T2WI呈环形高信号；慢性期X线、CT表现为不规则状、蜿蜒状骨质硬化，MR T1WI和T2WI均呈低信号。

Polynomial Wigner distribution offsets the disadvantage of WD in that it generates artifacts when processing none-linear modulated signal or multi-component signal. PWD can get FM signal IF direction of arbitrary orders, also fits for multi-component signal.

多项式维格纳分布弥补了WD分析非线性调频信号或者多频率分量信号时容易产生交叉项的缺点，对于任意阶次的调频信号，它都可以得到清晰的IF的走向。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。