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1、实验三、信号的谱分析五、窗函数window1.通过MATLAB的help功能，探究一Fwindow吋以支持的窗函数类型。输入helpwindow,举例岀现的函数类型如下：@bartlett@barthannwin@blackman・Bartlettwindow・-Mod讦iedBartlett-Hanningwindow.-Blackmanwindow・@blackmanharris・Minimum4-termBlackman-Harriswindow.@bohmanwin@chebwin@flattopwin@gausswin@hamming@hann@kaiser@nuttallwi
2、n@parzenwin@rectwin@tukeywin@triang-Bohmanwindow・-Chebyshevwindow・・FlatTopwindow.-Gaussianwindow・-Hammingwindow・-Hannwindow.-Kaiserwindow.-Nuttalldefinedminimum4-termBlackman-Harriswindow.-Parzen(delaValle-Poussin)window.・Rectangularwindow・-Tukeywindow・-Triangularwindow・2•用window产生的各种窗函数（可以设N=128
3、）,观察各个窗函数的波形。N二128;w=window(@bartlett,N);plot(l:N,w)w2uwindow®b-ackman・NrPOM1NW2)bart-eu」一~一"「/0.90.80.70.60.50.40.30.2pl00406080-00wlHwindow(©barthaniin、Nrpot(lNwl)0.90.80.70.60.50.40.30.2pl0w4uwindow©gausswin、N)；Pot(12、w4)b-ackmanw3Hwindow(©chebwin、N)；pot(lNW3)gausswinw5=window(@hamming,N);plot
4、(l:N,w5)hamming3.计算并分析各个窗函数的谱，观测其谱形状的特点。用wvtool函数观察各窗函数的幅频和相频特性：同上w-w5N=128;w=window(@bartlett,N);wl=window(@barthannwin,N);w2=window(@blackmarN);w3=window(@chebwin,N);w4=window(@gausswin,N);w5=window(@hamming,N);subplot(3,l,l)；wvtool(w);ylabel('barlett');subplot(3,l,2);wvtool(wl);ylabefbartharr
5、nwirV);subplot(3,l,3)；wvtool(w2);ylabelCblackman1)；subplot(6,l,4);wvtool(w3);ylabel('chebwin');subplot(6,l,5);wvtool(w4);ylabelfgausswin');subplot(6,l,6);wvtool(w5);ylabeK'hamming1);SarrplesNormalizedFrequency(xkrad/sample)Frequencydomain0.20.40.60.8NormalizedFrequency(xnrad/sample)2020■40■60■80■
6、40mp)pnuu詈Tmedomain20406080100120SarrplesII邨训wwiwrai删「Frequencydomain0.20.40.60.8NormalizedFrequency(xnrad/sample)5050■0019o50mp)OPWU6P乏Samplesmp)(Dpruc詈Frequencyaomain40kI20U-80■20■40■60■00.20.40.60.8NormalizedF
7、requency(xnrad/sample)4020Frequencydomainmp)opwu詈80■00o2020■40■60■0.20.40.60.8NormalizedFrequency(xnrad/sample)六、关于谱分析的截断效应实验1.N=20;fori=l:Nt(i)=0.01*(i-N/2);w(i)=(i-N/2)*2OO*pi/N;x(i)=2*sin(4*pi*t(i))+5*cos(6*pi*t(i))
