The chart was created by a printer connected to a radio frequency analyzer computer during measurements from a transmitter in a person ' s skull 這個(gè)表是由一個(gè)連接到一臺(tái)連接到無(wú)線電頻率分析電腦的打印機(jī),在測(cè)量來(lái)自一個(gè)人頭骨中的傳輸器的信號(hào)時(shí)繪制的。
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 本文針對(duì)現(xiàn)有頻譜分析儀的不足,運(yùn)用軟件無(wú)線電的思想,提出一種基于中頻數(shù)字化的虛擬射頻頻譜分析儀的方案,并對(duì)其可行性進(jìn)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 詳細(xì)的分析了基于labview的虛擬數(shù)字存儲(chǔ)示波器、虛擬頻譜分析儀和虛擬函數(shù)發(fā)生器的設(shè)計(jì)和實(shí)現(xiàn)的原理及算法,并且對(duì)于各虛擬儀器進(jìn)行了性能測(cè)試,給出了性能指標(biāo)。
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 重點(diǎn)對(duì)虛擬射頻頻譜分析儀中的數(shù)據(jù)采集電路可能造成的采樣誤差進(jìn)行了分析,提出了幾種可供選擇的解決方案,經(jīng)過(guò)理論分析、 matlab仿真和實(shí)際驗(yàn)證等手段,對(duì)這幾種方案的優(yōu)缺點(diǎn)進(jìn)行了比較和總結(jié),并最終確定了其中最適合虛擬射頻頻譜分析儀的方案。
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 在這一時(shí)期,由于計(jì)算機(jī)的快速發(fā)展以及快速傅立葉變換的普遍應(yīng)用,各種基于數(shù)字信號(hào)處理原理的頻率分析儀以及多功能信號(hào)分析軟件出現(xiàn),從而大大加強(qiáng)了對(duì)工程振動(dòng)信號(hào)的時(shí)域及頻域分析功能。