mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-04 16:31:17 -05:00
2c17544f3f
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/WSJT/trunk@1 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
69 lines
1.3 KiB
Fortran
69 lines
1.3 KiB
Fortran
subroutine bzap(dat,jz,nadd,mode,fzap)
|
|
|
|
parameter (NMAX=1024*1024)
|
|
parameter (NMAXH=NMAX)
|
|
real dat(jz),x(NMAX)
|
|
real fzap(200)
|
|
complex c(NMAX)
|
|
equivalence (x,c)
|
|
|
|
xn=log(float(jz))/log(2.0)
|
|
n=xn
|
|
if((xn-n).gt.0.) n=n+1
|
|
nfft=2**n
|
|
nh=nfft/nadd
|
|
nq=nh/2
|
|
do i=1,jz
|
|
x(i)=dat(i)
|
|
enddo
|
|
if(nfft.gt.jz) call zero(x(jz+1),nfft-jz)
|
|
|
|
call xfft(x,nfft)
|
|
|
|
C This is a kludge:
|
|
df=11025.0/(nadd*nfft)
|
|
if(mode.eq.2) df=11025.0/(2*nadd*nfft)
|
|
|
|
tol=10.
|
|
itol=nint(2.0/df)
|
|
do izap=1,200
|
|
if(fzap(izap).eq.0.0) goto 10
|
|
ia=(fzap(izap)-tol)/df
|
|
ib=(fzap(izap)+tol)/df
|
|
smax=0.
|
|
do i=ia+1,ib+1
|
|
s=real(c(i))**2 + imag(c(i))**2
|
|
if(s.gt.smax) then
|
|
smax=s
|
|
ipk=i
|
|
endif
|
|
enddo
|
|
fzap(izap)=df*(ipk-1)
|
|
|
|
do i=ipk-itol,ipk+itol
|
|
c(i)=0.
|
|
enddo
|
|
enddo
|
|
|
|
10 nzaps=izap
|
|
ia=70/df
|
|
do i=1,ia
|
|
c(i)=0.
|
|
enddo
|
|
ia=2700.0/df
|
|
do i=ia,nq+1
|
|
c(i)=0.
|
|
enddo
|
|
do i=2,nq
|
|
c(nh+2-i)=conjg(c(i))
|
|
enddo
|
|
|
|
call four2a(c,nh,1,1,-1)
|
|
fac=1.0/nfft
|
|
do i=1,jz/nadd
|
|
dat(i)=fac*x(i)
|
|
enddo
|
|
|
|
return
|
|
end
|