37 lines
512 B
Plaintext
37 lines
512 B
Plaintext
|
subroutine sh65snr(x,nz,snr)
|
||
|
|
|
||
|
|
real x(nz)
|
||
|
|
|
||
|
|
ipk=0 !Shut up compiler warnings. -db
|
||
|
|
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 subroutine sh65snr
|