subroutine hspec(id2,k,nutc0,ntrpdepth,nrxfreq,ntol,bmsk144,bcontest, & brxequal,ingain,mycall,hiscall,bshmsg,green,s,jh,line1,mygrid) ! Input: ! k pointer to the most recent new data ! nutc0 UTC for display of decode(s) ! ntrpdepth TR period and 1000*ndepth ! nrxfreq Rx audio center frequency ! ntol Decoding range is +/- ntol ! bmsk144 Boolean, true if in MSK144 mode ! brxequal Boolean, turns on equalization in MSK144 mode ! ingain Relative gain for spectra ! Output: ! green() power ! s() spectrum for horizontal spectrogram ! jh index of most recent data in green(), s() parameter (JZ=703) character*80 line1 character*12 mycall,hiscall character*6 mygrid integer*2 id2(0:120*12000-1) logical*1 bmsk144,bcontest,bshmsg,brxequal real green(0:JZ-1) real s(0:63,0:JZ-1) real x(512) complex cx(0:256) data rms/999.0/,k0/99999999/ equivalence (x,cx) save ja,rms0 ndepth=ntrpdepth/1000 ntrperiod=ntrpdepth - 1000*ndepth gain=10.0**(0.1*ingain) nfft=512 nstep=nfft nblks=7 if(ntrperiod.lt.30) then nstep=256 nblks=14 endif if(k.gt.30*12000) go to 900 if(k.lt.nfft) then jh=0 go to 900 !Wait for enough samples to start endif if(k.lt.k0) then !Start a new data block ja=-nstep jh=-1 rms0=0.0 endif do iblk=1,nblks if(jh.lt.JZ-1) jh=jh+1 ja=ja+nstep jb=ja+nfft-1 x=id2(ja:jb) sq=dot_product(x,x) rms=sqrt(gain*sq/nfft) green(jh)=0. if(rms.gt.0.0) green(jh)=20.0*log10(rms) call four2a(x,nfft,1,-1,0) !Real-to-complex FFT df=12000.0/nfft fac=(1.0/nfft)**2 do i=1,64 j=2*i sx=real(cx(j))**2 + aimag(cx(j))**2 + real(cx(j-1))**2 + & aimag(cx(j-1))**2 s(i-1,jh)=fac*gain*sx enddo if(ja+2*nfft.gt.k) exit enddo k0=k if(bmsk144) then if(k.ge.7168) then tsec=(k-7168)/12000.0 k0=k-7168 tt1=sum(float(abs(id2(k0:k0+3583)))) k0=k-3584 tt2=sum(float(abs(id2(k0:k0+3583)))) if(tt1.ne.0.0 .and. tt2.ne.0) then call mskrtd(id2(k-7168+1:k),nutc0,tsec,ntol,nrxfreq,ndepth, & mycall,mygrid,hiscall,bshmsg,bcontest,brxequal,line1) endif endif endif 900 return end subroutine hspec