subroutine specjtms(k,px,pxsmo,spk0,f0) ! Compute noise level and 2D spectra, for GUI display. parameter (NSMAX=30*48000) parameter (MAXFFT=8192) integer*2 id real x(MAXFFT) complex cx(MAXFFT),cx2(MAXFFT) logical first common/mscom/id(1440000),s1(215),s2(215),kin,ndiskdat,kline,nutc common/jt8com/nn(1800*12000),ss(184,32768),savg(32768) data first/.true./ save if(first) then pi=4.0*atan(1.0) twopi=2.0*pi kstep=2048 first=.false. sqsmo=0. endif if(k.lt.kstep .or. k.gt.NSMAX) return t=k/48000.0 nfft=4096 df=48000.0/nfft nh=nfft/2 ib=k ia=k-kstep+1 i0=k-nfft+1 sq=0. do i=ia,ib d=id(i) sq=sq + d*d enddo sq=sq/2048.0 sqsmo=0.95*sqsmo + 0.05*sq rms=sqrt(sq) px=db(sq) - 23.0 pxsmo=db(sqsmo) - 23.0 if(i0.gt.0) then do i=i0,ia-1 d=id(i) sq=sq + d*d enddo endif sq0=sq ! write(13,1010) t,rms,sq,px,pxsmo !1010 format(5f12.3) if(k.lt.nfft) return x(1:nfft)=id(i0:ib) fac=0.002/nfft cx=fac*x call four2a(cx,nfft,1,-1,1) !Forward c2c FFT iz=nint(2500.0/df) do i=1,iz !Save spectrum for plot s1(i)=real(cx(i+1))**2 + aimag(cx(i+1))**2 enddo cx(1)=0.5*cx(1) cx(nh+2:nfft)=0. call four2a(cx,nfft,1,1,1) !Inverse c2c FFT cx2(1:nfft)=cx(1:nfft)*cx(1:nfft) cx2(nfft+1:)=0.0 nfft=8192 df=48000.0/nfft call four2a(cx2,nfft,1,-1,1) !Forward c2c FFT of cx2 ! j0=nint(2.0*1428.57/df) j0=nint(2.0*1500.0/df) ja=j0-107 jb=j0+107 do j=ja,jb s2(j-ja+1)=1.e-4*(real(cx2(j))**2 + aimag(cx2(j))**2) enddo spk0=0. fac=(5e8/sq0)**2 s2=fac*s2 do j=1,215 if(s2(j).gt.spk0) then spk0=s2(j) f=(j+ja-1)*df f0=0.5*(f-3000.0) phi0=0.5*atan2(aimag(cx2(j)),real(cx2(j))) endif enddo spk0=0.5*db(spk0) - 7.0 kline=k/2048 ! write(14,3001) k/2048,spk0,f0,phi0 !3001 format(i8,3f12.3) ! call flush(14) return end subroutine specjtms