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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/map65@340 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
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Joe Taylor
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subroutine fil6521(c1,n1,c2,n2)
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C FIR lowpass filter designed using ScopeFIR
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C Pass #1 Pass #2
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C-----------------------------------------------
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C fsample (Hz) 1378.125 Input sample rate
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C Ntaps 21 Number of filter taps
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C fc (Hz) 40 Cutoff frequency
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C fstop (Hz) 172.266 Lower limit of stopband
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C Ripple (dB) 0.1 Ripple in passband
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C Stop Atten (dB) 38 Stopband attenuation
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C fout (Hz) 344.531 Output sample rate
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parameter (NTAPS=21)
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parameter (NH=NTAPS/2)
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parameter (NDOWN=4) !Downsample ratio = 1/4
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complex c1(n1)
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complex c2(n1/NDOWN)
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C Filter coefficients:
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real a(-NH:NH)
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data a/
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+ -0.011958606980,-0.013888627387,-0.015601306443,-0.010602249570,
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+ 0.003804023436, 0.028320058273, 0.060903935217, 0.096841904411,
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+ 0.129639871228, 0.152644580853, 0.160917511283, 0.152644580853,
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+ 0.129639871228, 0.096841904411, 0.060903935217, 0.028320058273,
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+ 0.003804023436,-0.010602249570,-0.015601306443,-0.013888627387,
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+ -0.011958606980/
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n2=(n1-NTAPS+NDOWN)/NDOWN
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k0=NH-NDOWN+1
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C Loop over all output samples
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do i=1,n2
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c2(i)=0.
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k=k0 + NDOWN*i
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do j=-NH,NH
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c2(i)=c2(i) + c1(j+k)*a(j)
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enddo
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enddo
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return
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end
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subroutine fil658(c1,n1,c2,n2)
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C FIR lowpass filter designed using ScopeFIR
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C Pass #1 Pass #2 Pass #3
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C-----------------------------------------------
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C fsample (Hz) 96000.0 24000 6000 Input sample rate
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C Ntaps 47 47 47 Number of filter taps
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C fc (Hz) 6000 1500 375 Cutoff frequency (-3 dB)
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C fstop (Hz) 11025.0 2756.25 689.0625 Lower limit of stopband
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C Ripple (dB) 0.06 0.06 0.06 Ripple in passband
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C Stop Atten (dB) 41 41 41 Stopband attenuation
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C fout (Hz) 24000.0 6000 1500 Output sample rate
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parameter (NTAPS=47)
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parameter (NH=NTAPS/2)
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parameter (NDOWN=4) !Downsample ratio = 1/4
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complex c1(n1)
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complex c2(n1/NDOWN)
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C Filter coefficients:
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real a(-NH:NH)
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data a/
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+ 0.004066057444,-0.000483030239,-0.002085155775,-0.004036668720,
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+ -0.005338083014,-0.004952374329,-0.002267639582, 0.002499787691,
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+ 0.008113543743, 0.012522509052, 0.013441779030, 0.009233544068,
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+ -0.000256999594,-0.013156485907,-0.025660797518,-0.032755808092,
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+ -0.029602578877,-0.013013352845, 0.017249853203, 0.057885304099,
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+ 0.102497204557, 0.142897857652, 0.171067807479, 0.181167084990,
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+ 0.171067807479, 0.142897857652, 0.102497204557, 0.057885304099,
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+ 0.017249853203,-0.013013352845,-0.029602578877,-0.032755808092,
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+ -0.025660797518,-0.013156485907,-0.000256999594, 0.009233544068,
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+ 0.013441779030, 0.012522509052, 0.008113543743, 0.002499787691,
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+ -0.002267639582,-0.004952374329,-0.005338083014,-0.004036668720,
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+ -0.002085155775,-0.000483030239, 0.004066057444/
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n2=(n1-NTAPS+NDOWN)/NDOWN
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k0=NH-NDOWN+1
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C Loop over all output samples
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do i=1,n2
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c2(i)=0.
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k=k0 + NDOWN*i
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do j=-NH,NH
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c2(i)=c2(i) + c1(j+k)*a(j)
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enddo
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enddo
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return
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end
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@ -0,0 +1,59 @@
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subroutine fil659(id,n1,f0,c2a,c2b,n2)
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C FIR lowpass filter designed using ScopeFIR
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C fsample (Hz) 96000.0 Input sample rate
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C Ntaps 23 Number of filter taps
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C fc (Hz) 1500 Cutoff frequency (-3 dB)
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C fstop (Hz) 12000 Lower limit of stopband
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C Ripple (dB) 0.05 Ripple in passband
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C Stop Atten (dB) 45 Stopband attenuation
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C fout (Hz) 24000.0 Output sample rate
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parameter (NTAPS=23)
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parameter (NH=NTAPS/2)
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parameter (NDOWN=4) !Downsample ratio = 1/4
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integer*2 id(4,n1)
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complex c2a(n1/NDOWN),c2b(n1/NDOWN)
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complex z
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real*8 dt,dpha,twopi
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complex w,w0,wstep
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data twopi/6.2831853071796/
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C Filter coefficients:
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real a(-NH:NH)
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data a/
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+ -0.006192694772,-0.009005098228,-0.011852791893,-0.011064464062,
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+ -0.004044201520, 0.010987986233, 0.034169891384, 0.063459565756,
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+ 0.094796253511, 0.122845919676, 0.142302928050, 0.149270332282,
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+ 0.142302928050, 0.122845919676, 0.094796253511, 0.063459565756,
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+ 0.034169891384, 0.010987986233,-0.004044201520,-0.011064464062,
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+ -0.011852791893,-0.009005098228,-0.006192694772/
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n2=(n1-NTAPS+NDOWN)/NDOWN
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k0=NH-NDOWN+1
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C Loop over all output samples
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dt=1.d0/96000.d0
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dpha=twopi*f0*dt
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wstep=cmplx(cos(dpha),sin(dpha))
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k=k0+NDOWN
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w0=1.0
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do i=1,n2
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c2a(i)=0.
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c2b(i)=0.
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k=k0 + NDOWN*i
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w=w0
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do j=-NH,NH
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w=w*wstep
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if(j.eq.3-NH) w0=w
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z=a(j)*cmplx(float(id(1,j+k)),float(id(2,j+k)))*w
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c2a(i)=c2a(i) + z
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z=a(j)*cmplx(float(id(3,j+k)),float(id(4,j+k)))*w
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c2b(i)=c2b(i) + z
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enddo
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enddo
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return
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end
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