数字信号

LabVIEW application environment is adopted for implementation of local instrument control. Programmable instruments such as function generator, multi-meters, and oscilloscopes have been linked to the computer through general purpose interface bus.

采用LabVIEW应用程序开发环境对本地仪器进行控制，并通过GPIB接口将可程控仪器，例如：函数信号发生器、数字万用表和示波器等设备连接到计算机上。

An ocean echo signal simulation system for verification and calibration of FMICW high frequency ground wave radar is presented in this paper.

该系统基于FMICW高频地波雷达的工作机理，以及一阶和二阶Bragg-Doppler谱的反演原理，利用直接数字合成的技术仿真出海洋雷达回波的模拟信号，以供雷达的校准与定标之用。

The pulse power supply consists of three-phase half-wave thyristor rectifier and IGBT chopping circuit.

该电源采用三相半波晶闸管整流电路，IGBT进行直流斩波；根据电流电压反馈信号计算偏差，进行数字PI调节获得恒流、恒压输出特性；控制系统通过20mA电流环异步串行通讯接口与人机界面交换数据。

Because the Hall probe circuit, magnetic-flux meter circuit and extension measurement circuit share the same A/D converter, but MAX110 only have two channel, so the system use CD4052. CD4052 is the analog switch controlled by microcomputer, which can switch the three input channels. The singles is passed to microcomputer after A/D converted.

所有与模拟电路有关的低频接口控制线都采用光电耦合器TPL521进行隔离，而频率较高采用6N137构成单片机相关外围器件的隔离，以便抑制数字电路的尖脉冲和其他噪声对模拟电路产生干扰，提高系统的信号噪声比。

The Three-Dimensional Kinematic Analysis on Spinning and Delivery Technique of Some Domestic Female Elite Hammer Thrower

主要研究基于数字射频存储器解决旋转状态下GPS信号的跟踪和定位问题，并利用Zarlink产品设计芯片级GPS接收机。

The turbulent signal measured by hot wire is decomposed into three parts with the digital filter and the wavelet analysis.

利用数字滤波方法和子波分析方法对用热线测得的湍流信号进行了三项分解。

Hence the method based on digital Hubert transformation performed in software is adopted.

进而采用了基于数字希尔伯特变换的软件方法来处理OCT信号。

Image signal processing and data collection, noise reduction algorithm and control to image data buffer storage can be realized by digital technology.

采用数字技术实现了图像信号处理与数据采集、CCD降噪的算法以及对图像缓冲存储器的控制。

In order to measure the passive network's conduction automatically, a network conduction instrumentation based on FPGA technology was designed and implemented according to the design principle of Virtual Instrument. System adopted FPGA technology building a digital flat-top to imitatively produce the high quality sine signal. Under the control of C8051MCU, measurement, calculation and display of the port network's conduction were automatic implementation. Furthermore, the system has the function of frequency step measurement.

摘 要：为了实现对无源端口网络的导纳进行自动测量，根据虚拟仪器设计思想，设计实现了基于FPGA的网络导纳测量仪，系统以FPGA作为数字平台模拟产生优质的正弦信号，在单片机C8051的控制和处理下，自动实现端口网络导纳值的测量、计算、显示，同时具有频率步进测量功能。

The experimental results show that the watermark can not be destroyed easily and the algorithm is robust and imperceptible.

实验结果表明该算法水印不易破坏，对数字音频信号的低通滤波、迭加噪声等攻击均具有很好的隐蔽性和稳健性。

They go to town. Would you just ask them?

他们在城里你能问他们吗？

Ossein pretreated for a2 weeks period exhibited the maximum% yield incase of bone gelatin, while the yield from intact skin was higher than that realized incase of de-scaled skin.

预处理时间达2星期的骨胶原表现出最高的骨明胶百分产量，然而从未处理鱼皮中得到的产率比去鳞的鱼皮得到的要高。