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FT4: Some groundwork for subtraction.

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This commit is contained in:
Steve Franke 2019-04-18 14:15:24 -05:00
parent f7b0e24e70
commit be72461142
6 changed files with 96 additions and 10 deletions
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1
CMakeLists.txt
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@ -555,6 +555,7 @@ set (wsjt_FSRCS
lib/stdmsg.f90
lib/subtract65.f90
lib/ft8/subtractft8.f90
lib/ft4/subtractft4.f90
lib/sun.f90
lib/symspec.f90
lib/symspec2.f90

4
lib/ft4/ft4sim_mult.f90
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@ -10,6 +10,7 @@ program ft4sim_mult
type(hdr) h !Header for .wav file
character arg*12,fname*17,cjunk*4
character msg37*37,msgsent37*37,c77*77
complex cwave0((NN+2)*NSPS)
real wave0((NN+2)*NSPS)
real wave(NZZ)
real tmp(NZZ)
@ -63,7 +64,8 @@ program ft4sim_mult
call pack77(msg37,i3,n3,c77)
call genft4(msg37,0,msgsent37,itone)
nwave0=(NN+2)*NSPS
call gen_ft4wave(itone,NN,NSPS,12000.0,f0,wave0,nwave0)
icmplx=0
call gen_ft4wave(itone,NN,NSPS,12000.0,f0,cwave0,wave0,icmplx,nwave0)
k0=nint((xdt+0.5)/dt)
if(k0.lt.1) k0=1

16
lib/ft4/gen_ft4wave.f90
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@ -1,6 +1,7 @@
subroutine gen_ft4wave(itone,nsym,nsps,fsample,f0,wave,nwave)
subroutine gen_ft4wave(itone,nsym,nsps,fsample,f0,cwave,wave,icmplx,nwave)
real wave(nwave)
complex cwave(nwave)
real pulse(6144) !512*4*3
real dphi(0:240000-1)
integer itone(nsym)
@ -34,19 +35,32 @@ subroutine gen_ft4wave(itone,nsym,nsps,fsample,f0,wave,nwave)
phi=0.0
dphi = dphi + twopi*f0*dt !Shift frequency up by f0
wave=0.
cwave=0.
k=0
do j=0,nwave-1
k=k+1
if(icmplx.eq.0) then
wave(k)=sin(phi)
else
cwave(k)=cmplx(cos(phi),sin(phi))
endif
phi=mod(phi+dphi(j),twopi)
enddo
! Compute the ramp-up and ramp-down symbols
if(icmplx.eq.0) then
wave(1:nsps)=wave(1:nsps) * &
(1.0-cos(twopi*(/(i,i=0,nsps-1)/)/(2.0*nsps)))/2.0
k1=(nsym+1)*nsps+1
wave(k1:k1+nsps-1)=wave(k1:k1+nsps-1) * &
(1.0+cos(twopi*(/(i,i=0,nsps-1)/)/(2.0*nsps)))/2.0
else
cwave(1:nsps)=cwave(1:nsps) * &
(1.0-cos(twopi*(/(i,i=0,nsps-1)/)/(2.0*nsps)))/2.0
k1=(nsym+1)*nsps+1
cwave(k1:k1+nsps-1)=cwave(k1:k1+nsps-1) * &
(1.0+cos(twopi*(/(i,i=0,nsps-1)/)/(2.0*nsps)))/2.0
endif
return
end subroutine gen_ft4wave

66
lib/ft4/subtractft4.f90 Normal file
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@ -0,0 +1,66 @@
subroutine subtractft4(dd,itone,f0,dt)
! Subtract an ft4 signal
!
! Measured signal : dd(t) = a(t)cos(2*pi*f0*t+theta(t))
! Reference signal : cref(t) = exp( j*(2*pi*f0*t+phi(t)) )
! Complex amp : cfilt(t) = LPF[ dd(t)*CONJG(cref(t)) ]
! Subtract : dd(t) = dd(t) - 2*REAL{cref*cfilt}
use timer_module, only: timer
parameter (NMAX=6*12000,NFRAME=(103+2)*79)
parameter (NFFT=NMAX,NFILT=1400)
real*4 dd(NMAX), window(-NFILT/2:NFILT/2), xjunk
complex cref,camp,cfilt,cw
integer itone(79)
logical first
data first/.true./
common/heap8/cref(NFRAME),camp(NMAX),cfilt(NMAX),cw(NMAX),xjunk(NFRAME)
save first
nstart=dt*12000+1
nsym=79
nsps=1920
fs=12000.0
icmplx=1
bt=1.0 ! Temporary compromise?
call gen_ft4wave(itone,nsym,nsps,fs,f0,cref,xjunk,icmplx,NFRAME)
camp=0.
do i=1,nframe
id=nstart-1+i
if(id.ge.1.and.id.le.NMAX) camp(i)=dd(id)*conjg(cref(i))
enddo
if(first) then
! Create and normalize the filter
pi=4.0*atan(1.0)
fac=1.0/float(nfft)
sum=0.0
do j=-NFILT/2,NFILT/2
window(j)=cos(pi*j/NFILT)**2
sum=sum+window(j)
enddo
cw=0.
cw(1:NFILT+1)=window/sum
cw=cshift(cw,NFILT/2+1)
call four2a(cw,nfft,1,-1,1)
cw=cw*fac
first=.false.
endif
cfilt=0.0
cfilt(1:nframe)=camp(1:nframe)
call four2a(cfilt,nfft,1,-1,1)
cfilt(1:nfft)=cfilt(1:nfft)*cw(1:nfft)
call four2a(cfilt,nfft,1,1,1)
! Subtract the reconstructed signal
do i=1,nframe
j=nstart+i-1
if(j.ge.1 .and. j.le.NMAX) dd(j)=dd(j)-2*REAL(cfilt(i)*cref(i))
enddo
return
end subroutine subtractft4

1
lib/ft8/gen_ft8wave.f90
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@ -42,6 +42,7 @@ subroutine gen_ft8wave(itone,nsym,nsps,bt,fsample,f0,cwave,wave,icmplx,nwave)
phi=0.0
dphi = dphi + twopi*f0*dt !Shift frequency up by f0
wave=0.
cwave=0.
k=0
do j=nsps,nsps+nwave-1 !Don't include dummy symbols
k=k+1

6
widgets/mainwindow.cpp
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@ -106,7 +106,7 @@ extern "C" {
float xjunk[], float wave[], int* icmplx, int* nwave);
void gen_ft4wave_(int itone[], int* nsym, int* nsps, float* fsample, float* f0,
float wave[], int* nwave);
float xjunk[], float wave[], int* icmplx, int* nwave);
void gen4_(char* msg, int* ichk, char* msgsent, int itone[],
int* itext, fortran_charlen_t, fortran_charlen_t);
@ -3745,7 +3745,9 @@ void MainWindow::guiUpdate()
float fsample=48000.0;
float f0=ui->TxFreqSpinBox->value() - m_XIT;
int nwave=(nsym+2)*nsps;
gen_ft4wave_(const_cast<int *>(itone),&nsym,&nsps,&fsample,&f0,foxcom_.wave,&nwave);
int icmplx=0;
gen_ft4wave_(const_cast<int *>(itone),&nsym,&nsps,&fsample,&f0,foxcom_.wave,
foxcom_.wave,&icmplx,&nwave);
}
if(SpecOp::EU_VHF==m_config.special_op_id()) {