信号发生器

Not only it is expediently to realize frequency, phase and amplitude modulation, but also it has well practicability.

采用FPGA设计的信号发生器，不仅可方便地实现各种比较复杂的调频、调相和调幅功能，而且具有良好的实用性。

This paper describes the process of developing signal generator application.

本文是关于以单片机AT89C51为核心芯片的信号发生器的软件开发。

Chapter 1 is introduction, introduced the application of sine signal generator to test system and its technological developments and trends.

论文第1章是绪论部分，介绍了正弦信号发生器在测试系统中的应用、技术发展及趋势。

The audio frequency sinusoidal signal generator is intended for adjusting and measuring parameters of audio equipment.

音频正弦信号发生器的用意是为调整和测量参数的音响设备。

The PXI modules include:PXI-1044 AC power supplies,14 slots and 3U box,PXI-5152 digital module,PXI-4072 digital multimeter module,PXI-5422 function signal generator module,PXI-5660 RF signal analyser modult,PXI-8351 zero slot controller module , PXI-6115 multi-function DAQ module , PXI-4461 dual-channel DAQ module,PXI-2593 matrix module and so on.

根据测试的要求所选用的PXI模块包括PXI-1044交流电源14插槽3U机箱、PXI-5152数字化仪模块、PXI-4072数字多用表模块、PXI-5422函数信号发生器模块、PXI-5660 RF信号分析仪模块、PXI-8351零槽控制器、PXI-6115多功能DAQ模块、PXI-4461双路数据采集模块、PXI-2593多路复用器/矩阵模块等。

By hardware and software platform, corresponsive control theory of AMB system is deeply researched comparing with improved ways, and get better technique project.

通过DSP所特有的PWM数字信号发生器，完成10路独立数字功放的信号输出，并结合改进型PID控制算法实现恒流控制效果。

The Laser Doppler vibrometer and signal generator are controlled by computer through GPIB bus, in order to make the system more automatic and compatible. A synchronous method for exciting signal and data acquisition is advanced and put into practice in the process of microstructures'free damping vibration.

通过GPIB总线控制激光多普勒测振仪的控制器和信号发生器以提高测试过程的自动化程度，使建立的自动化测量系统具有良好的通用性和可扩展性，并提出了自由衰减法测试的激励信号和数据采集卡同步采集的实现方法； 3。

It is composed of six parts: PCI Bus interface module, signal generator, signal adjustor, gain and phase detector, A/D conversion module and control and data process module. The system can measure the gain and phase curves of the crystal with the frequency range from 1MHz to 150 MHz. Crystal parameters can also be calculated, such as resonant frequency, series resistance, shunt capacitance, motion capacitance, motion inductance and Q factor, etc.

该测试卡以 IEC 444 标准为测量原理，由 PCI 总线接口模块、信号发生器、信号调理模块、增益相位检测电路、A/D 转换模块等部分组成，能够有效测量 1MHz～150 MHz 频率范围的晶振的增益与相位特性、串并联谐振频率、等效电阻、动态电容、动态电感、品质因数和负载频率等主要电参数。

The reference signal generating unit includes a local reference signal generator, an RF converter, a splitter, a phase detector, and a phase shifter.

参考信号发生单元包括本地参考信号发生器、RF转换器、分离器、鉴相器和移相器。

The test results show that the signals generated by the GPS signal simulator device meet the technical requirement.

与接收机联调的结果说明信号发生器产生的信号符合技术要求。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。