数字信号处理基于matlab(用DFT作谱分析,窗函数的设计)

1实验一用DFT作谱分析X11111X212344321N108X3COSN1PI/4N208X4SINN2PI/8FIGURESUBPLOT2,2,1STEMX1SUBPLOT2,2,2STEMX2SUBPLOT2,2,3STEMX3SUBPLOT2,2,4STEMX4N18F1X1FFTX1,N1F1X2FFTX2,N1F1X3FFTX3,N1F1X4FFTX4,N1FIGURESUBPLOT2,2,1STEMABSF1X1SUBPLOT2,2,2STEMABSF1X2SUBPLOT2,2,3STEMABSF1X3SUBPLOT2,2,4STEMABSF1X4N3256F3X1FFTX1,N3F3X2FFTX2,N3F3X3FFTX3,N3F3X4FFTX4,N3W2/N30N31FIGURESUBPLOT2,2,1PLOTW,ABSF3X1SUBPLOT2,2,2PLOTW,ABSF3X2SUBPLOT2,2,3PLOTW,ABSF3X3SUBPLOT2,2,4PLOTW,ABSF3X4N664T01/641/64N61X6COS8PITCOS16PITCOS20PITFIGUREPLOTX6FX6FFTX6,N6N64W62/N60N61FIGUREPLOTW6,FX62345实验二用双线性法设计IIR数字滤波器CLEARALLCLOSEALLCLCT1WP2/TTAN02PI/2WS2/TTAN03PI/2RP1RS15N,WCBUTTORDWP,WS,RP,RS,SB,ABUTTERN,WC,SC,DBILINEARB,A,1/TW00001PI05PIHFREQSB,A,WHDFREQZC,D,WFIGURESUBPLOT3,1,1PLOTW/PI,ABSHGRIDONTITLE模拟巴特沃斯滤波器XLABELFREQUENCY/HZYLABELMAGNITUDESUBPLOT3,1,2PLOTW/PI,ABSHDGRIDONTITLE数字巴特沃斯滤波器XLABELDIDITALFREQUENCY/PIYLABELMAGNITUDEHD_DB20LOGABSHD1/ABSHDEPSSUBPLOT3,1,3PLOTW/PI,HD_DBGRIDONTITLE数字巴特沃斯滤波器波特图XLABELDIDITALFREQUENCY/PIYLABELBD_MAGNITUDEX4,2,0,4,6,4,2,4,6,6,4,4,6,6,2,6,12,8,0,16,38,60,84,90,66,32,4,2,48,12,12,10,6,6,6,4,0,0,0,0,0,2,4,0,0,0,2,2,0,0,2,2,2,2,0M512FXFFTX,MYFILTERC,D,XFYFFTY,MF1/5120511250FIGURESUBPLOT2,1,1PLOTXSUBPLOT2,1,2PLOTF,ABSFXFIGURESUBPLOT2,1,1PLOTYSUBPLOT2,1,2PLOTF,ABSFY6心电图谱分析1、滤波前波形和频谱72、滤波后波形和频谱8实验三用窗函数法设计FIR数字滤波器一、N33，用四种窗设计滤波器FUNCTIONHDIDEALN,WCFORN0N1IFNN1/2HDN1WC/PIELSEHDN1SINWCNN1/2/PINN1/2ENDENDCLEARALLCLOSEALLCLCN33WCPI/4HDIDEALN,WCW1BOXCARNW2HAMMINGNW3HANNNW4BLACKMANNH1HDW1H2HDW2H3HDW3H4HDW4M512FH1FFTH1,MDB120LOG10ABSFH11/ABSFH1EPSFH2FFTH2,MDB220LOG10ABSFH21/ABSFH2EPSFH3FFTH3,MDB320LOG10ABSFH31/ABSFH3EPSFH4FFTH4,MDB420LOG10ABSFH41/ABSFH4EPSW2/M0M1FIGURESUBPLOT2,2,1STEMH1GRIDONTITLE矩形窗XLABELNYLABELHNSUBPLOT2,2,2PLOTW,ABSFH1GRIDONTITLE矩形窗XLABELWYLABELHKSUBPLOT2,2,3PLOTW,DB1GRIDON9TITLE矩形窗XLABELWYLABEL20LGHK/H0SUBPLOT2,2,4PLOTW,ANGLEFH1GRIDONTITLE矩形窗XLABELWYLABEL相位特性FIGURESUBPLOT2,2,1STEMH2GRIDONTITLE汉宁窗XLABELNYLABELHNSUBPLOT2,2,2PLOTW,ABSFH2GRIDONTITLE汉宁窗XLABELWYLABELHKSUBPLOT2,2,3PLOTW,DB2GRIDONTITLE汉宁窗XLABELWYLABEL20LGHK/H0SUBPLOT2,2,4PLOTW,ANGLEFH2GRIDONTITLE汉宁窗XLABELWYLABEL相位特性FIGURESUBPLOT2,2,1STEMH3GRIDONTITLE海明窗XLABELNYLABELHNSUBPLOT2,2,2PLOTW,ABSFH3GRIDONTITLE海明窗XLABELWYLABELHKSUBPLOT2,2,3PLOTW,DB3GRIDONTITLE海明窗XLABELW10YLABEL20LGHK/H0SUBPLOT2,2,4PLOTW,ANGLEFH3GRIDONTITLE海明窗XLABELWYLABEL相位特性FIGURESUBPLOT2,2,1STEMH4GRIDONTITLE布莱克曼窗XLABELNYLABELHNSUBPLOT2,2,2PLOTW,ABSFH4GRIDONTITLE布莱克曼窗XLABELWYLABELHKSUBPLOT2,2,3PLOTW,DB4GRIDONTITLE布莱克曼窗XLABELWYLABEL20LGHK/H0SUBPLOT2,2,4PLOTW,ANGLEFH4GRIDONTITLE布莱克曼窗XLABELWYLABEL相位特性111213二，用一种窗采用N15或N33、WPI/4设计滤波器CLEARALLCLOSEALLCLCN15WCPI/4HDIDEALN,WCW1BLACKMANNH1HDW1M512FH1FFTH1,MDB120LOG10ABSFH11/ABSFH1EPSW2/M0M1FIGURESUBPLOT2,2,1STEMH1GRIDONTITLE布莱克曼窗N15XLABELNYLABELHNSUBPLOT2,2,2PLOTW,ABSFH1GRIDONTITLE布莱克曼窗N15XLABELWYLABELHKSUBPLOT2,2,3PLOTW,DB1GRIDONTITLE布莱克曼窗N15XLABELWYLABEL20LGHK/H0SUBPLOT2,2,4PLOTW,ANGLEFH1GRIDONTITLE布莱克曼窗N15XLABELWYLABEL相位特性N33WCPI/4HDIDEALN,WCW2BLACKMANNH2HDW2M512FH2FFTH2,MDB220LOG10ABSFH21/ABSFH2EPSW2/M0M1FIGURESUBPLOT2,2,1STEMH2GRIDONTITLE布莱克曼窗N33XLABELN14YLABELHNSUBPLOT2,2,2PLOTW,ABSFH2GRIDONTITLE布莱克曼窗N33XLABELWYLABELHKSUBPLOT2,2,3PLOTW,DB2GRIDONTITLE布莱克曼窗N33XLABELWYLABEL20LGHK/H0SUBPLOT2,2,4PLOTW,ANGLEFH2GRIDONTITLE布莱克曼窗N33XLABELWYLABEL相位特性15三、提取50HZ基频信号N512T01/5121/512N1XSIN100PITSIN200PITSIN300PITFXFFTX,NW32/N0N1FIGURESUBPLOT2,1,1PLOTXGRIDONTITLE抽样信号XLABELNYLABELYNSUBPLOT2,1,2PLOTW3,ABSFXGRIDONTITLE抽样信号频谱XLABELPIYLABELMAGNITUDEN33WC04HDIDEALN,WCW1BOXCARNW2BLACKMANNH1HDW1Y1CONVX,H116H2HDW2Y2CONVX,H2FIGURESUBPLOT2,1,1PLOTY1164GRIDONTITLE矩形窗XLABELNYLABELYNSUBPLOT2,1,2PLOTY2164GRIDONTITLE布莱克曼窗XLABELNYLABELYNFY1FFTY1,NFY2FFTY2,NFIGURESUBPLOT2,1,1PLOTABSFY1SUBPLOT2,1,2PLOTABSFY217