mirror of https://github.com/saitohirga/WSJT-X.git
79 lines
1.6 KiB
Fortran
79 lines
1.6 KiB
Fortran
program ms3
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! Starting code for a JTMS3 decoder.
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character*80 infile
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parameter (NSMAX=30*48000)
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parameter (NFFT=8192,NH=NFFT/2)
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integer hdr(11)
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integer*2 id(NSMAX)
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real x(NFFT)
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complex cx(NFFT),cx2(NFFT)
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real s(NH)
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nargs=iargc()
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if(nargs.lt.1) then
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print*,'Usage: ms3 file1 [file2 ...]'
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print*,' Reads data from *.wav files.'
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go to 999
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endif
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npts=NSMAX
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kstep=1024
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nsteps=npts/kstep
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do ifile=1,nargs
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call getarg(ifile,infile)
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open(10,file=infile,access='stream',status='old',err=998)
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read(10) hdr
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read(10) id
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close(10)
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k=hdr(1)
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k=0
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do j=1,nsteps
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sq=0.
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do i=1,kstep
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k=k+1
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sq=sq + (0.001*id(k))**2
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enddo
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t=j*kstep/48000.0
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pdb=db(sq)
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write(13,1010) t,sq,pdb
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1010 format(3f12.3)
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enddo
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enddo
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iz=29.5*48000.0
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df=48000.0/nfft
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ja=nint(2600.0)/df
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jb=nint(3400.0)/df
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do i=1,iz,nh
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x(1:nfft)=0.001*id(i:i+nfft-1)
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call analytic(x,nfft,nfft,s,cx)
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t=i/48000.0
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sq=dot_product(x,x)
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write(14,1010) t,sq,db(sq)
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cx2=cx*cx
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call four2a(cx2,nfft,1,-1,1) !Forward c2c FFT
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smax=0.
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do j=ja,jb
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sq=1.e-6*(real(cx2(j))**2 + aimag(cx2(j))**2)
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f=(j-1)*df
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if(sq.gt.smax) then
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smax=sq
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xdf=0.5*(f-3000.0)
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endif
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write(15,1020) (j-1)*df,sq
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1020 format(f10.3,f12.3)
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enddo
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write(16,1030) t,smax,xdf
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1030 format(3f12.3)
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enddo
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go to 999
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998 print*,'Cannot open file:'
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print*,infile
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999 end program ms3
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