信号与线性系统PPT (2).pdf
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1、Experiment 2 Frequency domain analysis of continuous signal and system)PurposeExperiment contentExperiment principle and stepsExperimen results and analysis Experiment report writing1Further deepen the understanding of the concepts of continuous signal spectrum,continuous LTI system frequency respon
2、se,spectrum shift,filter,etc。2To further deepen the understanding of the time-domain sampling theorem,and be able to skillfully use the frequency-domain analysis theory and methods of signals and systems to analyze the principles and processes of signal sampling and recovery under aliasing and alias
3、ing conditions.3Master MATLAB-based continuous signal spectrum and continuous LTI system frequency response analysis method.4.Master the test method of frequency response of continuous LTI system.5.Familiar with signal and system frequency domain test and analysis method based on Multisim circuit si
4、mulation software.PurposeExperiment 2 Frequency domain analysis of continuous signal and system)Experiment contentThis experiment is based on the Multisim circuit simulation software and MATLAB platform.It focuses on the testing and analysis of the signal sampling and recovery process under the cond
5、itions of no aliasing and aliasing.It mainly completes the following aspects of the experimental content:experimental plan planning and design,system(Recovery filter)Frequency response design and testing,signal sampling and recovery under aliasing and aliasing conditions.1.Planning and design of the
6、 experimental plan.2.Parameter design and test of the sampling recovery filter.Based on MATLAB design,the parameters of the recovery filter(parameter values of the filter circuit components)are calculated.Based on Multisim software,the frequency domain characteristics of the designed restoration fil
7、ter are tested and verified.3.Test and analysis of signal sampling and recovery process without aliasing.Based on Multisim software,complete the time domain waveform and spectrum test of the signals involved in the sampling and recovery process,analyze the results,and discuss the principle and proce
8、ss of signal sampling and recovery under the alias-free condition.4.Signal sampling and recovery process testing and analysis under aliasing conditions.Based on Multisim software,complete the time domain waveform and spectrum test of the signals involved in the sampling and recovery process,and anal
9、yze the results,5.Discuss the principle and process of signal sampling and recovery under aliasing conditions.Experiment 2 Frequency domain analysis of continuous signal and system)Experimental principleFigure 1 Schematic diagram of the signal sampling circuitU1AMC74HC4066N1D21S11IN13VDD14VSS7U2ANE5
10、532P32481VDD15VVDD15VVSS-15VVSS-15VR13.3k信 号 输 入取 样 脉 冲 序 列取 样 输 出 By changing the frequency and duty cycle of the sampling pulse sequence(usually rectangular pulse sequence),you can obtain sampling signals with different frequencies and different sampling pulse widths at the sampling output end.Exp
11、eriment 2 Frequency domain analysis of continuous signal and system)U2BNE5532P56487R175kR2150kR2kRF7.5kC22.2FC12.2FXFG2VCC15VVSS-15VXSC1ABCDGT输 入 端输 出 端U2BNE5532P56487C133nFC233nFR23.3kR34.7kR47.5kR57.5k输 入输 出The structure of the filter circuit is the same as that of the large inertia system circuit
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