mirror of https://github.com/saitohirga/WSJT-X.git
129 lines
3.5 KiB
Fortran
129 lines
3.5 KiB
Fortran
subroutine symspec(shared_data,k,TRperiod,nsps,ingain,bLowSidelobes, &
|
|
nminw,pxdb,s,df3,ihsym,npts8,pxdbmax,npct)
|
|
|
|
! Input:
|
|
! k pointer to the most recent new data
|
|
! TRperiod T/R sequence length, seconds
|
|
! nsps samples per symbol, at 12000 Hz
|
|
! bLowSidelobes true to use windowed FFTs
|
|
! ndiskdat 0/1 to indicate if data from disk
|
|
|
|
! Output:
|
|
! pxdb raw power (0-90 dB)
|
|
! s() current spectrum for waterfall display
|
|
! ihsym index number of this half-symbol (1-184) for 60 s modes
|
|
|
|
! jt9com
|
|
! ss() JT9 symbol spectra at half-symbol steps
|
|
! savg() average spectra for waterfall display
|
|
|
|
use, intrinsic :: iso_c_binding, only: c_int, c_short, c_float, c_char
|
|
include 'jt9com.f90'
|
|
|
|
type(dec_data) :: shared_data
|
|
real*8 TRperiod
|
|
real*4 w3(MAXFFT3)
|
|
real*4 s(NSMAX)
|
|
real*4 ssum(NSMAX)
|
|
real*4 xc(0:MAXFFT3-1)
|
|
real*4 tmp(NSMAX)
|
|
complex cx(0:MAXFFT3/2)
|
|
integer nch(7)
|
|
logical*1 bLowSidelobes
|
|
|
|
common/spectra/syellow(NSMAX),ref(0:3456),filter(0:3456)
|
|
data k0/99999999/,nfft3z/0/
|
|
data nch/1,2,4,9,18,36,72/
|
|
equivalence (xc,cx)
|
|
save
|
|
|
|
if(TRperiod+npct.eq.-999.9) stop !Silence compiler warning
|
|
nfft3=16384 !df=12000.0/16384 = 0.732422
|
|
jstep=nsps/2 !Step size = half-symbol in id2()
|
|
if(k.gt.NMAX) go to 900
|
|
if(k.lt.2048) then !(2048 was nfft3) (Any need for this ???)
|
|
ihsym=0
|
|
go to 900 !Wait for enough samples to start
|
|
endif
|
|
|
|
if(nfft3.ne.nfft3z) then
|
|
! Compute new window
|
|
pi=4.0*atan(1.0)
|
|
w3=0
|
|
call nuttal_window(w3,nfft3)
|
|
nfft3z=nfft3
|
|
endif
|
|
|
|
if(k.lt.k0) then !Start a new data block
|
|
ja=0
|
|
ssum=0.
|
|
ihsym=0
|
|
if(.not. shared_data%params%ndiskdat) shared_data%id2(k+1:)=0 !Needed to prevent "ghosts". Not sure why.
|
|
endif
|
|
gain=10.0**(0.1*ingain)
|
|
sq=0.
|
|
pxmax=0.;
|
|
|
|
! dwell_time=0.0001
|
|
! if(k.gt.k0 .and. npct.gt.0) call blanker(shared_data%id2(k0+1:k), &
|
|
! k-k0,dwell_time,npct)
|
|
|
|
do i=k0+1,k
|
|
x1=shared_data%id2(i)
|
|
if (abs(x1).gt.pxmax) pxmax = abs(x1);
|
|
sq=sq + x1*x1
|
|
enddo
|
|
pxdb = 0.
|
|
if(sq.gt.0.0) pxdb=10*log10(sq/(k-k0))
|
|
pxdbmax=0.
|
|
if(pxmax.gt.0) pxdbmax = 20*log10(pxmax)
|
|
|
|
k0=k
|
|
ja=ja+jstep !Index of first sample
|
|
|
|
fac0=0.1
|
|
do i=0,nfft3-1 !Copy data into cx
|
|
j=ja+i-(nfft3-1)
|
|
xc(i)=0.
|
|
if(j.ge.1 .and.j.le.NMAX) xc(i)=fac0*shared_data%id2(j)
|
|
enddo
|
|
ihsym=ihsym+1
|
|
|
|
if(bLowSidelobes) xc(0:nfft3-1)=w3(1:nfft3)*xc(0:nfft3-1) !Apply window
|
|
call four2a(xc,nfft3,1,-1,0) !Real-to-complex FFT
|
|
|
|
df3=12000.0/nfft3 !JT9: 0.732 Hz = 0.42 * tone spacing
|
|
iz=min(NSMAX,nint(5000.0/df3))
|
|
fac=(1.0/nfft3)**2
|
|
do i=1,iz
|
|
j=i-1
|
|
if(j.lt.0) j=j+nfft3
|
|
sx=fac*(real(cx(j))**2 + aimag(cx(j))**2)
|
|
if(ihsym.le.184) shared_data%ss(ihsym,i)=sx
|
|
ssum(i)=ssum(i) + sx
|
|
s(i)=1000.0*gain*sx
|
|
enddo
|
|
|
|
shared_data%savg=ssum/ihsym
|
|
|
|
if(mod(ihsym,10).eq.0) then
|
|
mode4=nch(nminw+1)
|
|
nsmo=min(10*mode4,150)
|
|
nsmo=4*nsmo
|
|
call flat1(shared_data%savg,iz,nsmo,syellow)
|
|
if(mode4.ge.2) call smo(syellow,iz,tmp,mode4)
|
|
if(mode4.ge.2) call smo(syellow,iz,tmp,mode4)
|
|
syellow(1:250)=0.
|
|
ia=500./df3
|
|
ib=2700.0/df3
|
|
smin=minval(syellow(ia:ib))
|
|
smax=maxval(syellow(1:iz))
|
|
syellow=(50.0/(smax-smin))*(syellow-smin)
|
|
where(syellow<0) syellow=0.
|
|
endif
|
|
|
|
900 npts8=k/8
|
|
|
|
return
|
|
end subroutine symspec
|