WSJT-X/avesp2.f

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subroutine avesp2(dat,jza,nadd,f0,NFreeze,MouseDF,
+ DFTolerance,fzap)
real dat(jza)
integer DFTolerance
real psa(1024) !Ave ps, flattened and rolled off
real ref(557) !Ref spectrum, lines excised
real birdie(557) !Birdie spectrum (ave-ref)
real variance(557)
real s2(557,323)
real fzap(200)
iz=557 !Compute the 2d spectrum
df=11025.0/2048.0
nfft=nadd*1024
jz=jza/nfft
do j=1,jz
k=(j-1)*nfft + 1
call ps(dat(k),nfft,psa)
call move(psa,s2(1,j),iz)
enddo
C Flatten s2 and get psa, ref, and birdie
call flatten(s2,557,jz,psa,ref,birdie,variance)
call zero(fzap,200)
ia=300/df
ib=2700/df
n=0
do i=ia,ib
if(birdie(i)-ref(i).gt.3.0) then
f=i*df
if(NFreeze.eq.0 .or.
+ abs(f-1270.46-MouseDF).gt.float(DFTolerance)) then
if(abs(f-f0).gt.25.0) then
if(n.lt.200 .and. variance(i-1).lt.2.5 .and.
+ variance(i).lt.2.5 .and. variance(i+1).lt.2.5) then
n=n+1
fzap(n)=i*df
endif
endif
endif
endif
enddo
return
end