mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-29 23:58:39 -05:00
43 lines
1.3 KiB
Fortran
43 lines
1.3 KiB
Fortran
|
subroutine spec64(c0,npts2,mode64,jpk,s3,LL,NN)
|
||
|
|
|
||
|
|
parameter (NSPS=3456) !Samples per symbol at 6000 Hz
|
||
|
|
complex c0(0:360000) !Complex spectrum of dd()
|
||
|
|
complex cs(0:NSPS-1) !Complex symbol spectrum
|
||
|
|
real s3(LL,NN) !Synchronized symbol spectra
|
||
|
|
real xbase0(LL),xbase(LL)
|
||
|
|
|
||
|
|
nfft=nsps
|
||
|
|
fac=1.0/nfft
|
||
|
|
do j=1,NN
|
||
|
|
jj=j+7 !Skip first Costas array
|
||
|
|
if(j.ge.33) jj=j+14 !Skip middle Costas array
|
||
|
|
ja=jpk + (jj-1)*nfft
|
||
|
|
jb=ja+nfft-1
|
||
|
|
cs(0:nfft-1)=fac*c0(ja:jb)
|
||
|
|
call four2a(cs,nfft,1,-1,1)
|
||
|
|
do ii=1,LL
|
||
|
|
i=ii-65
|
||
|
|
if(i.lt.0) i=i+nfft
|
||
|
|
s3(ii,j)=real(cs(i))**2 + aimag(cs(i))**2
|
||
|
|
enddo
|
||
|
|
enddo
|
||
|
|
|
||
|
|
df=6000.0/nfft
|
||
|
|
do i=1,LL
|
||
|
|
call pctile2(s3(i,1:NN),NN,45,xbase0(i)) !Get baseline for passband shape
|
||
|
|
enddo
|
||
|
|
|
||
|
|
nh=25
|
||
|
|
xbase(1:nh-1)=sum(xbase0(1:nh-1))/(nh-1.0)
|
||
|
|
xbase(LL-nh+1:LL)=sum(xbase0(LL-nh+1:LL))/(nh-1.0)
|
||
|
|
do i=nh,LL-nh
|
||
|
|
xbase(i)=sum(xbase0(i-nh+1:i+nh))/(2*nh+1) !Smoothed passband shape
|
||
|
|
enddo
|
||
|
|
|
||
|
|
do i=1,LL
|
||
|
|
s3(i,1:NN)=s3(i,1:NN)/(xbase(i)+0.001) !Apply frequency equalization
|
||
|
|
enddo
|
||
|
|
|
||
|
|
return
|
||
|
|
end subroutine spec64
|