mirror of https://github.com/saitohirga/WSJT-X.git
191 lines
6.2 KiB
Fortran
191 lines
6.2 KiB
Fortran
subroutine short65(data,jz,NFreeze,MouseDF,DFTolerance,
|
|
+ mode65,nspecialbest,nstest,dfsh,iderrbest,idriftbest,
|
|
+ snrdb,ss1a,ss2a,nwsh,idfsh)
|
|
|
|
C Checks to see if this might be a shorthand message.
|
|
C This is done before zapping, downsampling, or normal decoding.
|
|
|
|
parameter (NP2=60*11025) !Size of data array
|
|
parameter (NFFT=16384) !FFT length
|
|
parameter (NH=NFFT/2) !Step size
|
|
parameter (MAXSTEPS=60*11025/NH) !Max # of steps
|
|
|
|
real data(jz)
|
|
integer DFTolerance
|
|
real s2(NH,MAXSTEPS) !2d spectrum
|
|
real ss(NH,4) !Save spectra in four phase bins
|
|
real psavg(NH)
|
|
real sigmax(4) !Peak of spectrum at each phase
|
|
real ss1a(-224:224) !Lower magenta curve
|
|
real ss2a(-224:224) !Upper magenta curve
|
|
real ss1(-473:1784) !Lower magenta curve (temp)
|
|
real ss2(-473:1784) !Upper magenta curve (temp)
|
|
real ssavg(-11:11)
|
|
integer ipk(4) !Peak bin at each phase
|
|
save
|
|
|
|
nspecialbest=0 !Default return value
|
|
nstest=0
|
|
df=11025.0/NFFT
|
|
|
|
C Do 16 k FFTs, stepped by 8k. (*** Maybe should step by 4k? ***)
|
|
call zero(psavg,NH)
|
|
nsteps=(jz-NH)/(4*NH)
|
|
nsteps=4*nsteps !Number of steps
|
|
do j=1,nsteps
|
|
k=(j-1)*NH + 1
|
|
call ps(data(k),NFFT,s2(1,j)) !Get power spectra
|
|
if(mode65.eq.4) then
|
|
call smooth(s2(1,j),NH)
|
|
call smooth(s2(1,j),NH)
|
|
endif
|
|
call add(psavg,s2(1,j),psavg,NH)
|
|
enddo
|
|
|
|
call flat1(psavg,s2,NH,nsteps,NH,MAXSTEPS)
|
|
|
|
nfac=40*mode65
|
|
dtstep=0.5/df
|
|
fac=dtstep/(60.0*df)
|
|
|
|
C Define range of frequencies to be searched
|
|
fa=max(200.0,1270.46+MouseDF-600.0)
|
|
fb=min(4800.0,1270.46+MouseDF+600.0)
|
|
ia=fa/df
|
|
ib=fb/df + 4.1*nfac !Upper tone is above sync tone by 4*nfac*df Hz
|
|
if(NFreeze.eq.1) then
|
|
fa=max(200.0,1270.46+MouseDF-DFTolerance)
|
|
fb=min(4800.0,1270.46+MouseDF+DFTolerance)
|
|
endif
|
|
ia2=fa/df
|
|
ib2=fb/df + 4.1*nfac !Upper tone is above sync tone by 4*nfac*df Hz
|
|
if(ib2.gt.NH) ib2=NH
|
|
|
|
C Find strongest line in each of the 4 phases, repeating for each drift rate.
|
|
sbest=0.
|
|
snrbest=0.
|
|
idz=6.0/df !Is this the right drift range?
|
|
do idrift=-idz,idz
|
|
drift=idrift*df*60.0/49.04
|
|
call zero(ss,4*NH) !Clear the accumulating array
|
|
do j=1,nsteps
|
|
n=mod(j-1,4)+1
|
|
k=nint((j-nsteps/2)*drift*fac) + ia
|
|
call add(ss(ia,n),s2(k,j),ss(ia,n),ib-ia+1)
|
|
enddo
|
|
|
|
do n=1,4
|
|
sigmax(n)=0.
|
|
do i=ia2,ib2
|
|
sig=ss(i,n)
|
|
if(sig.ge.sigmax(n)) then
|
|
ipk(n)=i
|
|
sigmax(n)=sig
|
|
if(sig.ge.sbest) then
|
|
sbest=sig
|
|
nbest=n
|
|
fdotsh=drift
|
|
endif
|
|
endif
|
|
enddo
|
|
enddo
|
|
n2best=nbest+2
|
|
if(n2best.gt.4) n2best=nbest-2
|
|
xdf=min(ipk(nbest),ipk(n2best))*df - 1270.46
|
|
if(NFreeze.eq.1 .and. abs(xdf-mousedf).gt.DFTolerance) goto 10
|
|
|
|
idiff=abs(ipk(nbest)-ipk(n2best))
|
|
xk=float(idiff)/nfac
|
|
k=nint(xk)
|
|
iderr=nint((xk-k)*nfac)
|
|
nspecial=0
|
|
maxerr=nint(0.008*abs(idiff) + 0.51)
|
|
if(abs(iderr).le.maxerr .and. k.ge.2 .and. k.le.4) nspecial=k
|
|
if(nspecial.gt.0) then
|
|
call getsnr(ss(ia2,nbest),ib2-ia2+1,snr1)
|
|
call getsnr(ss(ia2,n2best),ib2-ia2+1,snr2)
|
|
snr=0.5*(snr1+snr2)
|
|
if(snr.gt.snrbest) then
|
|
snrbest=snr
|
|
nspecialbest=nspecial
|
|
nstest=snr/2.0 - 2.0 !Threshold set here
|
|
if(nstest.lt.0) nstest=0
|
|
if(nstest.gt.10) nstest=10
|
|
dfsh=nint(xdf)
|
|
iderrbest=iderr
|
|
idriftbest=idrift
|
|
snrdb=db(snr) - db(2500.0/df) - db(sqrt(nsteps/4.0))+1.8
|
|
n1=nbest
|
|
n2=n2best
|
|
ipk1=ipk(n1)
|
|
ipk2=ipk(n2)
|
|
endif
|
|
endif
|
|
if(nstest.eq.0) nspecial=0
|
|
10 enddo
|
|
|
|
if(nstest.eq.0) nspecialbest=0
|
|
df4=4.0*df
|
|
if(nstest.gt.0) then
|
|
|
|
if(ipk1.gt.ipk2) then
|
|
ntmp=n1
|
|
n1=n2
|
|
n2=ntmp
|
|
ntmp=ipk1
|
|
ipk1=ipk2
|
|
ipk2=ntmp
|
|
endif
|
|
|
|
call zero(ss1,2258)
|
|
call zero(ss2,2258)
|
|
do i=ia2,ib2,4
|
|
f=df*i
|
|
k=nint((f-1270.46)/df4)
|
|
ss1(k)=0.3 * (ss(i-2,n1) + ss(i-1,n1) + ss(i,n1) +
|
|
+ ss(i+1,n1) + ss(i+2,n1))
|
|
ss2(k)=0.3 * (ss(i-2,n2) + ss(i-1,n2) + ss(i,n2) +
|
|
+ ss(i+1,n2) + ss(i+2,n2))
|
|
enddo
|
|
|
|
kpk1=nint(0.25*ipk1-472.0)
|
|
kpk2=kpk1 + nspecial*mode65*10
|
|
ssmax=0.
|
|
do i=-10,10
|
|
ssavg(i)=ss1(kpk1+i) + ss2(kpk2+i)
|
|
if(ssavg(i).gt.ssmax) then
|
|
ssmax=ssavg(i)
|
|
itop=i
|
|
endif
|
|
enddo
|
|
base=0.25*(ssavg(-10)+ssavg(-9)+ssavg(9)+ssavg(10))
|
|
shalf=0.5*(ssmax+base)
|
|
do k=1,8
|
|
if(ssavg(itop-k).lt.shalf) go to 110
|
|
enddo
|
|
k=8
|
|
110 x=(ssavg(itop-(k-1))-shalf)/(ssavg(itop-(k-1))-ssavg(itop-k))
|
|
do k=1,8
|
|
if(ssavg(itop+k).lt.shalf) go to 120
|
|
enddo
|
|
k=8
|
|
120 x=x+(ssavg(itop+(k-1))-shalf)/(ssavg(itop+(k-1))-ssavg(itop+k))
|
|
nwsh=nint(x*df4)
|
|
endif
|
|
|
|
C See if orange/magenta curves need to be shifted:
|
|
idfsh=0
|
|
if(mousedf.lt.-600) idfsh=-670
|
|
if(mousedf.gt.600) idfsh=1000
|
|
if(mousedf.gt.1600) idfsh=2000
|
|
if(mousedf.gt.2600) idfsh=3000
|
|
i0=nint(idfsh/df4)
|
|
|
|
do i=-224,224
|
|
ss1a(i)=ss1(i+i0)
|
|
ss2a(i)=ss2(i+i0)
|
|
enddo
|
|
|
|
return
|
|
end
|