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52 lines
1018 B
Fortran
52 lines
1018 B
Fortran
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subroutine freqcal(id2,k,nfreq,ntol,line)
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parameter (NZ=30*12000,NFFT=55296,NH=NFFT/2)
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integer*2 id2(0:NZ-1)
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real x(0:NFFT-1)
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real s(NH)
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character line*27
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complex cx(0:NH)
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equivalence (x,cx)
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data n/0/,k0/9999999/
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save n,k0
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if(k.lt.k0) n=0
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k0=k
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x=0.001*id2(k-NFFT:k-1)
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call four2a(x,NFFT,1,-1,0) !Compute spectrum, r2c
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df=12000.0/NFFT
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ia=nint((nfreq-ntol)/df)
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ib=nint((nfreq+ntol)/df)
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smax=0.
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s=0.
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do i=ia,ib
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s(i)=real(cx(i))**2 + aimag(cx(i))**2
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if(s(i).gt.smax) then
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smax=s(i)
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ipk=i
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endif
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enddo
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call peakup(s(ipk-1),s(ipk),s(ipk+1),dx)
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fpeak=df * (ipk+dx)
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sum=0.
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nsum=0
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do i=ia,ib
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if(abs(i-ipk).gt.10) then
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sum=sum+s(i)
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nsum=nsum+1
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endif
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enddo
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ave=sum/nsum
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pave=db(ave) + 8.0
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snr=db(smax/ave)
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! if(snr.lt.20.0) cflag='*'
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n=n+1
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write(line,1100) fpeak,snr
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1100 format(2f8.1)
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line(27:27)=char(0)
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return
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end subroutine freqcal
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