mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-26 22:28:41 -05:00
9c3b30d927
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7428 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
86 lines
2.7 KiB
Fortran
86 lines
2.7 KiB
Fortran
subroutine analytic(d,npts,nfft,c,dpc,bseq,bdeq)
|
|
|
|
! Convert real data to analytic signal
|
|
|
|
parameter (NFFTMAX=1024*1024)
|
|
|
|
real d(npts) ! passband signal
|
|
real h(NFFTMAX/2) ! real BPF magnitude
|
|
real dpc(3),dpclast(3) ! dynamic phase coeffs
|
|
real spc(3),spclast(3) ! static phase coeffs
|
|
real sac(5),saclast(5) ! amp coeffs
|
|
real fp
|
|
|
|
complex corrs(NFFTMAX/2) ! allpass static phase correction
|
|
complex corrd(NFFTMAX/2) ! allpass overall phase correction
|
|
complex c(NFFTMAX) ! analytic signal
|
|
|
|
logical*1 bseq ! boolean static equalizer flag
|
|
logical*1 bdeq ! boolean dynamic equalizer flag
|
|
logical*1 bseqlast
|
|
|
|
data nfft0/0/
|
|
data bseqlast/.false./
|
|
data spclast/0.0,0.0,0.0/
|
|
data saclast/1.0,0.0,0.0,0.0,0.0/
|
|
data spc/-0.952,0.768,-0.565/ ! baseline phase coeffs for TS2000
|
|
data sac/1.0,0.05532,0.11438,0.12918,0.09274/ ! amp coeffs for TS2000
|
|
|
|
save corrs,corrd,nfft0,h,sac,spc,saclast,spclast,dpclast,pi,t,beta
|
|
|
|
df=12000.0/nfft
|
|
nh=nfft/2
|
|
if( nfft.ne.nfft0 ) then
|
|
pi=4.0*atan(1.0)
|
|
t=1.0/2000.0
|
|
beta=0.1
|
|
do i=1,nh+1
|
|
ff=(i-1)*df
|
|
f=ff-1500.0
|
|
h(i)=1.0
|
|
if(abs(f).gt.(1-beta)/(2*t) .and. abs(f).le.(1+beta)/(2*t)) then
|
|
h(i)=h(i)*0.5*(1+cos((pi*t/beta )*(abs(f)-(1-beta)/(2*t))))
|
|
elseif( abs(f) .gt. (1+beta)/(2*t) ) then
|
|
h(i)=0.0
|
|
endif
|
|
enddo
|
|
nfft0=nfft
|
|
endif
|
|
|
|
if( any(spclast .ne. spc) .or. any(saclast .ne. sac) .or. any(dpclast .ne. dpc) ) then
|
|
spclast=spc
|
|
dpclast=dpc
|
|
saclast=sac
|
|
do i=1,nh+1
|
|
ff=(i-1)*df
|
|
f=ff-1500.0
|
|
fp=f/1000.0
|
|
ps=fp*fp*(spc(1)+fp*(spc(2)+fp*spc(3)))
|
|
amp=sac(1)+fp*(sac(2)+fp*(sac(3)+fp*(sac(4)+fp*sac(5))))
|
|
corrs(i)=amp*cmplx(cos(ps),sin(ps))
|
|
pd=fp*fp*(dpc(1)+fp*(dpc(2)+fp*dpc(3)))
|
|
corrd(i)=cmplx(cos(pd),sin(pd))
|
|
enddo
|
|
endif
|
|
|
|
fac=2.0/nfft
|
|
c(1:npts)=fac*d(1:npts)
|
|
c(npts+1:nfft)=0.
|
|
call four2a(c,nfft,1,-1,1) !Forward c2c FFT
|
|
|
|
if( (.not. bseq) .and. (.not. bdeq) ) then
|
|
c(1:nh+1)=h(1:nh+1)*c(1:nh+1)
|
|
else if( bseq .and. (.not. bdeq) ) then
|
|
c(1:nh+1)=h(1:nh+1)*corrs(1:nh+1)*c(1:nh+1)
|
|
else if( (.not. bseq) .and. bdeq ) then
|
|
c(1:nh+1)=h(1:nh+1)*corrd(1:nh+1)*c(1:nh+1)
|
|
else if( bseq .and. bdeq ) then
|
|
c(1:nh+1)=h(1:nh+1)*corrs(1:nh+1)*corrd(1:nh+1)*c(1:nh+1)
|
|
endif
|
|
|
|
c(1)=0.5*c(1) !Half of DC term
|
|
c(nh+2:nfft)=0. !Zero the negative frequencies
|
|
call four2a(c,nfft,1,1,1) !Inverse c2c FFT
|
|
return
|
|
end subroutine analytic
|