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Fix a probmel with decoding FT4 from .wav files.

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This commit is contained in:
Joe Taylor 2019-04-03 09:25:32 -04:00
parent c8dae29425
commit 013c06b6ca
3 changed files with 18 additions and 18 deletions
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27
lib/ft4/ft4sim.f90
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@ -6,18 +6,19 @@ program ft4sim
use packjt77
include 'ft4_params.f90' !Set various constants
parameter (NWAVE=NN*NSPS)
parameter (NZZ=18*3456) !62208
type(hdr) h !Header for .wav file
character arg*12,fname*17
character msg37*37,msgsent37*37
character c77*77
complex c0(0:NMAX-1)
complex c(0:NMAX-1)
real wave(NMAX)
real dphi(0:NMAX-1)
complex c0(0:NZZ-1)
complex c(0:NZZ-1)
real wave(NZZ)
real dphi(0:NZZ-1)
real pulse(3*NSPS)
integer itone(NN)
integer*1 msgbits(77)
integer*2 iwave(NMAX) !Generated full-length waveform
integer*2 iwave(NZZ) !Generated full-length waveform
integer icos4(4)
data icos4/0,1,3,2/
@ -100,7 +101,8 @@ program ft4sim
phi=0.0
c0=0.0
dphi=dphi+twopi*f0*dt
do j=0,NMAX-1
! do j=0,NMAX-1 !### ??? ###
do j=0,(NN+2)*NSPS-1
c0(j)=cmplx(cos(phi),sin(phi))
phi=mod(phi+dphi(j),twopi)
enddo
@ -109,13 +111,13 @@ program ft4sim
c0((NN+1)*NSPS:(NN+2)*NSPS-1)=c0((NN+1)*NSPS:(NN+2)*NSPS-1)*(1.0+cos(twopi*(/(i,i=0,NSPS-1)/)/(2.0*NSPS) ))/2.0
c0((NN+2)*NSPS:)=0.
k=nint((xdt+0.14)/dt)
k=nint((xdt+0.35)/dt)
c0=cshift(c0,-k)
ia=k
do ifile=1,nfiles
c=c0
if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c,NMAX,NWAVE,fs,delay,fspread)
if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c,NZZ,NWAVE,fs,delay,fspread)
c=sig*c
ib=k
@ -124,7 +126,7 @@ program ft4sim
nslots=1
if(snrdb.lt.90) then
do i=1,NMAX !Add gaussian noise at specified SNR
do i=1,NZZ !Add gaussian noise at specified SNR
xnoise=gran()
wave(i)=wave(i) + xnoise
enddo
@ -140,15 +142,14 @@ program ft4sim
endif
if(any(abs(wave).gt.32767.0)) print*,"Warning - data will be clipped."
iwave=nint(wave)
h=default_header(12000,NMAX+2208)
h=default_header(12000,NZZ)
write(fname,1102) ifile
1102 format('000000_',i6.6,'.wav')
open(10,file=fname,status='unknown',access='stream')
write(10) h,iwave !Save to *.wav file
iwave(1:2208)=0
write(10) iwave(1:2208) !Add 0.5 s of zeroes
close(10)
write(*,1110) ifile,xdt,f0,snrdb,fname
1110 format(i4,f7.2,f8.2,f7.1,2x,a17)
enddo
enddo
999 end program ft4sim

6
lib/ft4_decode.f90
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@ -90,11 +90,9 @@ contains
0,1,0,1,0,1,1,0,1,1,1,1,1,0,0,0,1,0,1/
save fs,dt,tt,txt,twopi,h,one,first,apbits,nappasses,naptypes, &
mycall0,hiscall0,msg0,cqstr0,ctwk2
this%callback => callback
this%callback => callback
hhmmss=cdatetime0(8:13)
if(first) then
fs=12000.0/NDOWN !Sample rate after downsampling
dt=1/fs !Sample interval after downsample (s)
@ -471,7 +469,7 @@ contains
endif
enddo !Sequence estimation
enddo !Candidate list
return
end subroutine decode

3
widgets/mainwindow.cpp
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@ -2690,7 +2690,8 @@ void MainWindow::diskDat() //diskDat()
float bw=m_config.RxBandwidth();
if(db > 0.0) degrade_snr_(dec_data.d2,&dec_data.params.kin,&db,&bw);
for(int n=1; n<=m_hsymStop; n++) { // Do the waterfall spectra
k=(n+1)*kstep;
// k=(n+1)*kstep; //### Why was this (n+1) ??? ###
k=n*kstep;
if(k > dec_data.params.kin) break;
dec_data.params.npts8=k/8;
dataSink(k);