The Fortran code to program ADC cards with an RMS filter

Software/ADC/rec_m4i_tdfilter_rms.f

+c     gfortran rec_m4i_tdfilter_rms.f m4iset_extrig_rms.c /usr/lib64/libspcm_linux.so -o rec_m4i_tdfilter_rms
+c     copy the line above to create and executable file
+      implicit real*8 (a-h,o-z)
+
+      integer*2 fid1(20000000)
+
+      complex*16 f0(20000000)
+      complex*16 fmix0(1000001)
+
+      complex*16 chelp0,offset0
+
+      
+      pi=4.d0*datan(1.d0)
+      dt=1.d0/500.d6
+      
+
+      nfit2=1000
+      nfit=2*nfit2
+      
+      fsig=0.d0
+
+
+      ndp=12800000+2000000
+      nposttr=ndp-1000000
+
+      aread=m4iset(fid1,ndp,nposttr)
+
+
+c -----------------------------------------------
+
+
+      do i=1,ndp
+        f0(i)=dcmplx(dfloat(fid1(i)),0.d0)
+      enddo
+
+
+
+c -----------------------------------------------
+
+      windi0=0.d0
+
+      do i=1,2*nfit+1
+        x=dfloat(i-1)/dfloat(nfit)-1.d0
+        fmix0(i)=cdexp((0.d0,2.d0)*pi*fsig*dfloat(i-1)*dt)
+        windi0=windi0+wind(x)
+        fmix0(i)=fmix0(i)*wind(x)
+      enddo
+
+
+c -----------------------------------------------
+
+      do i=1,ndp-2*nfit-1,nfit
+        time=dfloat(i-1)*dt
+        chelp0=(0.d0,0.d0)
+        do ii=2,2*nfit
+            chelp0=chelp0+f0(i-1+ii)*fmix0(ii)
+        enddo
+        chelp0=2.d0*chelp0*cdexp((0.d0,2.d0)*pi*fsig*time)/windi0
+        print *,time+2*nfit2*dt,cdabs(chelp0)
+      enddo
+
+
+      end
+
+
+c--------------------------------------------------------------------
+
+      real*8 function wind(x)
+      implicit real*8 (a-h,o-z)
+      pi=4.d0*datan(1.d0)
+      if(dabs(x).le.1.d0) then
+      if(dabs(x).ne.0.d0) then
+      wind=dexp(-1.d0/(1.d0-x*x))*dsin(2.073d0*pi*x)/x
+      else
+      wind=dexp(-1.d0/(1.d0-x*x))*2.073d0*pi
+      endif
+      else
+      wind=0.d0
+      endif
+      end
+
+
+c--------------------------------------------------------------------