Essentially, ping sends an echo packet to the device, and expects the device to echo the packet contents back.
简单地说，ping向设备发送一个echo数据包，期望设备把数据包的内容发送回来。
In the paper the methods to process weak echo by using DSP technology based on low SNR of laser weak echo are presented. And the methods are simulated and calculated.
文章针对激光弱小回波信号的低信噪比，提出了运用数字信号处理技术对回波信号进行处理的方法，并进行了一系列仿真和计算。
The model of radar echo signal is founded based on the analysis of SAR imaging theory in this paper. Thereout, a method used to make SAR echo data is put forward.
在分析合成孔径雷达成像原理的基础上，建立了雷达回波信号模型，提出了一种生成回波数据的方法。
For problems existed when processing echo signal of ultrasonic distance measuring system, two new ways of echo signal processing to improve measure precision are proposed.
在分析超声波测距系统回波信号处理存在问题的基础上，提出了两种提高测量精度的回波信号处理方法。
Relationship between the target scattering function and the echo signal is deduced to hold as a Fourier transform pair by analyzing the texture of echo signal for a passive radar imaging system;
首先分析了无源雷达成像系统的目标回波形式，得到了目标散射分布函数和雷达接收信号之间的傅里叶变换对关系；
NLMS (normalized least mean square) algorithm is widely used in echo canceller. However, due to high correlation of speech signals, the performance of echo canceller based on NLMS is depressed.
NLMS算法是回声消除器中最常用的算法之一，然而语音信号的强相关性使NLMS(归一化最小均方)算法的收敛速度变慢。
The algorithm USES an adaptive filter to track the echo path, and an auxiliary filter to cancel the echo together with the adaptive filter.
该算法使用自适应滤波器跟踪回声信道，使用一个辅助滤波器和自适应滤波器一起完成回声消除。
According to characteristic of direct wave in PGPR echo, 2d filtering, matrix filtering and horizontal high pass filtering are tried to remove direct wave in PGPR echo.
针对PGPR回波中直达波的特性，尝试用二维滤波、模板滤波和水平高通滤波去除PGPR直达波并分析各个方法的利弊。
Non-precipitation echo from radar such as ground objects echo and super refraction and so on are important to explore quantitatively precipitation and the other products.
地物和超折射等非降水回波是影响雷达定量探测降水和其他产品的重要因素，利用降水和非降水回波反射率三维结构特征可以对雷达数据进行质量控制。
Non-precipitation echo from radar such as ground objects echo and super refraction and so on are important to explore quantitatively precipitation and the other products.
地物和超折射等非降水回波是影响雷达定量探测降水和其他产品的重要因素，利用降水和非降水回波反射率三维结构特征可以对雷达数据进行质量控制。
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