mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-11-03 21:40:52 -05:00
60 lines
1.3 KiB
Fortran
60 lines
1.3 KiB
Fortran
|
subroutine hspec(id2,k,ingain,green,s,jh)
|
||
|
|
|
||
|
|
! Input:
|
||
|
|
! k pointer to the most recent new data
|
||
|
|
|
||
|
|
! Output:
|
||
|
|
! green() power
|
||
|
|
! s() spectrum for horizontal spectrogram
|
||
|
|
! jh index of most recent data in green(), s()
|
||
|
|
|
||
|
|
parameter (JZ=703)
|
||
|
|
integer*2 id2(0:120*12000-1)
|
||
|
|
real green(0:JZ-1)
|
||
|
|
real s(0:63,0:JZ-1)
|
||
|
|
real x(512)
|
||
|
|
complex cx(0:256)
|
||
|
|
data rms/999.0/,k0/99999999/
|
||
|
|
equivalence (x,cx)
|
||
|
|
save ja,rms0
|
||
|
|
|
||
|
|
gain=10.0**(0.1*ingain)
|
||
|
|
nfft=512
|
||
|
|
if(k.gt.30*12000) go to 900
|
||
|
|
if(k.lt.nfft) then
|
||
|
|
jh=0
|
||
|
|
go to 900 !Wait for enough samples to start
|
||
|
|
endif
|
||
|
|
|
||
|
|
if(k.lt.k0) then !Start a new data block
|
||
|
|
ja=0
|
||
|
|
jh=-1
|
||
|
|
rms0=0.0
|
||
|
|
endif
|
||
|
|
|
||
|
|
do iblk=1,7
|
||
|
|
if(jh.lt.JZ-1) jh=jh+1
|
||
|
|
jb=ja+nfft-1
|
||
|
|
x=id2(ja:jb)
|
||
|
|
sq=dot_product(x,x)
|
||
|
|
rms=sqrt(gain*sq/nfft)
|
||
|
|
green(jh)=0.
|
||
|
|
if(rms.gt.0.0) green(jh)=20.0*log10(0.5*(rms0+rms))
|
||
|
|
rms0=rms
|
||
|
|
call four2a(x,nfft,1,-1,0) !Real-to-complex FFT
|
||
|
|
df=12000.0/nfft
|
||
|
|
fac=(1.0/nfft)**2
|
||
|
|
do i=1,64
|
||
|
|
j=2*i
|
||
|
|
sx=real(cx(j))**2 + aimag(cx(j))**2 + real(cx(j-1))**2 + &
|
||
|
|
aimag(cx(j-1))**2
|
||
|
|
s(i-1,jh)=fac*gain*sx
|
||
|
|
enddo
|
||
|
|
if(ja+2*nfft.gt.k) exit
|
||
|
|
ja=ja+nfft
|
||
|
|
enddo
|
||
|
|
k0=k
|
||
|
|
|
||
|
|
900 return
|
||
|
|
end subroutine hspec
|