WSJT-X/getsnr.f

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subroutine getsnr(x,nz,snr)
real x(nz)
smax=-1.e30
do i=1,nz
if(x(i).gt.smax) then
ipk=i
smax=x(i)
endif
s=s+x(i)
enddo
s=0.
ns=0
do i=1,nz
if(abs(i-ipk).ge.3) then
s=s+x(i)
ns=ns+1
endif
enddo
ave=s/ns
sq=0.
do i=1,nz
if(abs(i-ipk).ge.3) then
sq=sq+(x(i)-ave)**2
ns=ns+1
endif
enddo
rms=sqrt(sq/(nz-2))
snr=(smax-ave)/rms
return
end