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📄 试验四 用窗函数设计fir数字滤波器－dreammengjian－tom 博客.mht

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                      <TD class=3DdateStyle>2006-03-13 11:05:59 Mon | =
=D4=C4=B6=C1=A3=A8<FONT=20
                        class=3DnumberStyle>227</FONT>=A3=A9=B4=CE=20
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                        <DIV class=3DarticleText>=CA=D4=D1=E9=CB=C4 =
=D3=C3=B4=B0=BA=AF=CA=FD=C9=E8=BC=C6FIR=CA=FD=D7=D6=C2=CB=B2=A8=C6=F7<BR>=
=D2=BB=A3=AC=20
                        =CA=D4=D1=E9=C4=BF=B5=C4<BR>1=A3=AE =
=D5=C6=CE=D5=B4=B0=BA=AF=CA=FD=C9=E8=BC=C6FIR=CA=FD=D7=D6=C2=CB=B2=A8=C6=F7=
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                        =
=CA=EC=CF=A4=CF=DF=D0=D4=CF=E0=CE=BBFIR=CA=FD=D7=D6=C2=CB=B2=A8=C6=F7=B5=C4=
=CC=D8=D0=D4<BR>3=A3=AE =
=C1=CB=BD=E2=B4=B0=BA=AF=CA=FD=B6=D4=CA=FD=D7=D6=C2=CB=B2=A8=C6=F7=B5=C4=D3=
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                        =
=CA=D4=D1=E9=B3=CC=D0=F2=A3=BA<BR>1=A3=AEideal_lp(Wc,N)<BR>function=20
                        =
hd=3Dideal_lp(Wc,N)<BR>alpha=3D(N-1)/2;<BR>n=3D[0:1:(N-1)];<BR>m=3Dn-alph=
a+eps;<BR>hd=3Dsin(Wc*m)./(pi*m);<BR>2=A3=AE<BR>%=C2=F6=B3=E5=CF=EC=D3=A6=
=B2=BB=B1=E4=B7=A8=C9=E8=BC=C6=CA=FD=D7=D6=C2=CB=B2=A8=C6=F7(P180=D2=B3=C0=
=FD6.4.2)<BR>wp=3D0.2*pi;<BR>ws=3D0.3*pi;<BR>Ap=3D1;<BR>As=3D15;<BR><BR>[=
N,Wc]=3Dbuttord(wp,ws,Ap,As,'s')<BR>[z,p,k]=3Dbuttap(N);<BR>[b,a]=3Dzp2tf=
(z,p,k)<BR>Wc<BR>[bt,at]=3Dlp2lp(b,a,Wc)<BR>figure<BR>[H,W]=3Dfreqs(bt,at=
);<BR>plot(W/(2*pi),abs(H))<BR><BR>[bz,az]=3Dimpinvar(bt,at)<BR>figure<BR=
>freqz(bz,az)<BR>%=CB=AB=CF=DF=D0=D4=B1=E4=BB=BB=B7=A8=C9=E8=BC=C6=CA=FD=D7=
=D6=C2=CB=B2=A8=C6=F7(P180=D2=B3=C0=FD6.4.2)<BR>wp=3D0.2*pi;<BR>ws=3D0.3*=
pi;<BR>Ap=3D1;<BR>As=3D15;<BR><BR>T=3D1;<BR>wp=3D(2/T)*tan(wp/2);<BR>ws=3D=
(2/T)*tan(ws/2);<BR><BR>[N,Wc]=3Dbuttord(wp,ws,Ap,As,'s')<BR>[z,p,k]=3Dbu=
ttap(N);<BR>[b,a]=3Dzp2tf(z,p,k)<BR>[bt,at]=3Dlp2lp(b,a,Wc)<BR>figure<BR>=
[H,W]=3Dfreqs(bt,at);<BR>plot(W/(2*pi),abs(H))<BR><BR>[bd,ad]=3Dbilinear(=
bt,at,T)<BR>figure<BR>freqz(bd,ad)<BR><BR>%=B8=DF=CD=A8=CA=FD=D7=D6=C2=CB=
=B2=A8=C6=F7(P183=D2=B3=C0=FD6.5.1)<BR>[N,Wc]=3Dbuttord(1,3.71,3,15,'s')<=
BR>[z,p,k]=3Dbuttap(N);<BR>[b,a]=3Dzp2tf(z,p,k);<BR>[bt,at]=3Dlp2lp(b,a,6=
.155)<BR>figure<BR>[H,W]=3Dfreqs(bt,at);<BR>plot(W/pi,abs(H))<BR><BR>T=3D=
1;<BR>[bd,ad]=3Dbilinear(bt,at,T)<BR>[H,W]=3Dfreqz(bd,ad);<BR>figure<BR>p=
lot(W/pi,abs(H))<BR><BR>%=B4=F8=CD=A8=CA=FD=D7=D6=C2=CB=B2=A8=C6=F7(P183=D2=
=B3=C0=FD6.5.1)<BR>[N,Wc]=3Dbuttord(1,3.71,3,15,'s')<BR>[z,p,k]=3Dbuttap(=
N);<BR>[b,a]=3Dzp2tf(z,p,k);<BR>[bt,at]=3Dlp2lp(b,a,6.155)<BR>figure<BR>[=
H,W]=3Dfreqs(bt,at);<BR>plot(W/pi,abs(H))<BR><BR>T=3D1;<BR>[bd,ad]=3Dbili=
near(bt,at,T)<BR>[H,W]=3Dfreqz(bd,ad);<BR>figure<BR>plot(W/pi,abs(H))<BR>=
<BR>%=D3=C3=B4=B0=BA=AF=CA=FD=B7=A8=C9=E8=BC=C6FIR=C2=CB=B2=A8=C6=F7=A3=A8=
=CF=B0=CC=E27.2.1=A3=A9<BR>%=C9=E8=BC=C6FIR=B5=CD=CD=A8=C2=CB=B2=A8=C6=F7=
<BR>WC=3D0.2*pi;<BR>N=3D11;<BR>M=3D20<BR>n=3D[0:1:M-1];<BR>hd=3Dideal_lp(=
WC,M);<BR>w_ham=3D(rectwin(M))';<BR>h=3Dhd.*w_ham;<BR>[db,mag,pha,grd,w]=3D=
freqz_m(h,[1]);<BR><BR>%plots<BR>figure(1)<BR>plot(w/pi,db,'k--','Linewid=
th',1.5);<BR>hold<BR><BR>w_ham=3D(hann(M))';<BR>h=3Dhd.*w_ham;<BR>[db,mag=
,pha,grd,w]=3Dfreqz_m(h,[1]);<BR>plot(w/pi,db,'k','Linewidth',1.5);<BR>%=C9=
=E8=BC=C6FIR=B8=DF=CD=A8=C2=CB=B2=A8=C6=F7<BR>WC=3D0.8*pi;<BR>N=3D11;<BR>=
n=3D[0:1:M-1];<BR>hd=3Dideal_lp(pi,M)-ideal_lp(wc,M);<BR>w_ham=3D(rectwin=
(M))';<BR>h=3Dhd.*w_ham;<BR>[db,mag,pha,grd,w]=3Dfreqz_m(h,[1]);<BR><BR>%=
plots<BR>figure(1)<BR>plot(w/pi,db,'k--','Linewidth',1.5);<BR>hold<BR><BR=
>w_ham=3D(hann(M))';<BR>h=3Dhd.*w_ham;<BR>[db,mag,pha,grd,w]=3Dfreqz_m(h,=
[1]);<BR>plot(w/pi,db,'k','Linewidth',1.5);<BR>%=C9=E8=BC=C6FIR=B4=F8=CD=A8=
=C2=CB=B2=A8=C6=F7<BR>ws1=3D0.2*pi;wp1=3D0.35*pi;<BR>ws2=3D0.65*pi;wp2=3D=
0.8*pi;<BR>As=3D60;<BR>tr_width=3Dmin((wp1-ws1),(ws2-wp2))<BR>M=3Dceil(12=
*pi/tr_width)+1<BR>n=3D[0:1:M-1];<BR>wc1=3D(ws1+wp1)/2;wc2=3D(wp2+ws2)/2;=
<BR>hd=3Dideal_lp(wc2,M)-ideal_lp(wc1,M);<BR>w_bla=3D(blackman(M))';<BR>h=
=3Dhd.*w_bla;<BR>[db,mag,pha,grd,w]=3Dfreqz_m(h,[1]);<BR>%=C9=E8=BC=C6=B4=
=F8=D7=E8=C2=CB=B2=A8=C6=F7<BR>ws1=3D0.2*pi;wp1=3D0.35*pi;<BR>ws2=3D0.65*=
pi;wp2=3D0.8*pi;<BR>As=3D60;<BR>tr_width=3Dmin((ws1-wp1),(wp2-ws2))<BR>M=3D=
ceil(12*pi/tr_width)+1<BR>if=20
                        ~mod(M,2)<BR>&nbsp; &nbsp;=20
                        =
M=3DM+1;<BR>end<BR>M<BR>n=3D[0:1:M-1];<BR>wc1=3D(ws1+wp1)/2;wc2=3D(wp2+ws=
2)/2;<BR>hd=3Dideal_lp(wc1,M)+ideal_lp(pi,M)-ideal_lp(wc2,M);<BR>h=3Dhd.*=
w_bla;<BR>[db,mag,pha,grd,w]=3Dfreqz_m(h,[1]);<BR><BR><BR><BR><BR><BR><BR=
><BR><BR><BR><BR><BR><BR><BR><BR></DIV></TD></TR>
                    <TR>
                      <TD>
                        <DIV id=3DextInfor></DIV></TD></TR>
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                      <TD class=3DdateStyle>
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href=3D"http://blog.tom.com/blog/read.php?bloggerid=3D653495&amp;blogid=3D=
41255">=C9=CF=D2=BB=C6=AA</A></B>=20
                        <B><A=20
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href=3D"http://blog.tom.com/blog/read.php?bloggerid=3D653495&amp;blogid=3D=
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