The chart was created by a printer connected to a radio frequency analyzer computer during measurements from a transmitter in a person ' s skull 这个表是由一个连接到一台连接到无线电频率分析电脑的打印机,在测量来自一个人头骨中的传输器的信号时绘制的。
In order to overcome the disadvantages of the existed frequency spectrum analyzer instrument , the idea of software radio was applied , and a scheme of rf virtual frequency analyzer instrument based on digital intermediate frequency was presented , then its feasibility was analyzed 本文针对现有频谱分析仪的不足,运用软件无线电的思想,提出一种基于中频数字化的虚拟射频频谱分析仪的方案,并对其可行性进行分析。
The principles and arithmetic for designing and realizing the virtual digital stored oscilloscope , virtual frequency analyzer and virtual function generator , which are based on labview , are discussed in detail . the performance of the virtual instruments is tested , and the specification is given 详细的分析了基于labview的虚拟数字存储示波器、虚拟频谱分析仪和虚拟函数发生器的设计和实现的原理及算法,并且对于各虚拟仪器进行了性能测试,给出了性能指标。
Sample error probably caused from data collection circuit of rf virtual frequency spectrum analyzer instrument was emphasized , and some kinds of selectable resolution scheme were presented , then these schemes of advantages and disadvantages were compared and summarized by the way of theory analyse , matlab simulation and practice validate and so on , at last , the optimum scheme of rf virtual frequency analyzer instrument was decided and adopted 重点对虚拟射频频谱分析仪中的数据采集电路可能造成的采样误差进行了分析,提出了几种可供选择的解决方案,经过理论分析、 matlab仿真和实际验证等手段,对这几种方案的优缺点进行了比较和总结,并最终确定了其中最适合虚拟射频频谱分析仪的方案。
In this time , as a result of major development in computer technologies and fast fourier transform wider application , many frequency analyzer based on digital signal processing theory and multi - function signal analysis software occurred . which greatly strengthened analysis function to engineer vibration signal ' s time field and frequency field 在这一时期,由于计算机的快速发展以及快速傅立叶变换的普遍应用,各种基于数字信号处理原理的频率分析仪以及多功能信号分析软件出现,从而大大加强了对工程振动信号的时域及频域分析功能。