Consumer display applications commonly use high-speed LVDS interfaces to transfer videodata. Spread-SPECTRUM clocking can be used to address electromagnetic compatibility (EMC)issues within these consumer devices. This application note uses Spartan®-6 FPGAs togenerate spread-SPECTRUM clocks using the DCM_CLKGEN primitive.
為提升虛擬儀器傳輸速率與實(shí)時(shí)性能，擴(kuò)展監(jiān)測(cè)范圍，在VC的軟件平臺(tái)上設(shè)計(jì)了一種全功能虛擬示波器。與傳統(tǒng)虛擬示波器相比，該系統(tǒng)采用嵌入式系統(tǒng)完成信號(hào)采集，采用工業(yè)以太網(wǎng)為傳輸介質(zhì)，通過線性插值算法和多線程編程思想，實(shí)現(xiàn)波形顯示、參數(shù)計(jì)算、頻譜分析以及波形存儲(chǔ)及回放功能。實(shí)驗(yàn)結(jié)果表明，該虛擬示波器可以實(shí)現(xiàn)20 kHz采樣頻率下的波形精確顯示，達(dá)到預(yù)期的各項(xiàng)指標(biāo)。
Abstract:
o enhance the transfer rate and real-time of virtual instrument performance， expand scope of monitoring， this paper uses the VCs software platform to design a fully functional virtual oscilloscope. Compared with traditional virtual oscilloscope， this system adopts the embedded system to complete the data acquisition， industrial Ethernet as the transmission medium used by the linear interpolation algorithm and multi-threaded programming ideas， namely to achieve waveform display， parameter calculation， SPECTRUM analysis and waveform storage and playback. Experimental results show that the virtual oscilloscope can accurately display the waveform with 20kHz sampling frequency， and achieve the desired targets.
Consumer display applications commonly use high-speed LVDS interfaces to transfer videodata. Spread-SPECTRUM clocking can be used to address electromagnetic compatibility (EMC)issues within these consumer devices. This application note uses Spartan®-6 FPGAs togenerate spread-SPECTRUM clocks using the DCM_CLKGEN primitive.
THIS M-FILE USES THE TRANFER MATRIX METHOD TO EVALUATE THE COUPLED-MODE
％EQUATIONS. THE REFLECTION SPECTRUM OF THE GRATING AND THE TRANSMISSION
％SPECTRUM, DELAY AND DISPERSION OF THE FABRY-PEROT FILTER ARE SIMULATED
The Engineering Vibration Toolbox is a set of educational programs
written in Octave by Joseph C. Slater. Also included are a number of help files,
demonstration examples, and data files containing raw experimental data. The
codes include single degree of freedom response, response SPECTRUM, finite
elements, numerical integration, and phase plane analysis.
％WAVETEST Example Matlab script for WAVELET, using NINO3 SST dataset
％
％ See "http://paos.colorado.edu/research/wavelets/"
％ Written January 1998 by C. Torrence
％
％ Modified Oct 1999, changed Global Wavelet SPECTRUM (GWS) to be sideways,
％ changed all "log" to "log2", changed logarithmic axis on GWS to
％ a normal axis.
Using spectra to calculate strength of reflections and losses in passive cavities.The wavelength, reflection SPECTRUM and transmission SPECTRUM should be in the first 3 columns of an Excel file, which is selected when the cavity.m Matlab file is run.
