WSJT-X/lib/symspec.f90
Joe Taylor 0e87c974e9 Modified behavior of audio level meter and adjacent slider; Tx6 at program startup.
1. Level meter range increased to 0-90 dB.
2. Level meter reading is independent of slider setting.
3. For a trial period: thermometer bar goes red if a 16-bit sample
   is within 5 dB A/D limit.
4. Slider can be used to adjust levels sent to waterfall.
5. Tx6 message is selected on program startup.
Thanks to W9MDB for most of this code.



git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7596 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2017-03-06 14:34:25 +00:00

131 lines
3.5 KiB
Fortran

subroutine symspec(shared_data,k,ntrperiod,nsps,ingain,nminw,pxdb,s, &
df3,ihsym,npts8, rmsnogain, pxdbmax)
! Input:
! k pointer to the most recent new data
! ntrperiod T/R sequence length, minutes
! nsps samples per symbol, at 12000 Hz
! ndiskdat 0/1 to indicate if data from disk
! nb 0/1 status of noise blanker (off/on)
! nbslider NB setting, 0-100
! Output:
! pxdb power (0-60 dB)
! s() current spectrum for waterfall display
! ihsym index number of this half-symbol (1-184) for 60 s modes
! jt9com
! ss() JT9 symbol spectra at half-symbol steps
! savg() average spectra for waterfall display
use, intrinsic :: iso_c_binding, only: c_int, c_short, c_float, c_char
include 'jt9com.f90'
type(dec_data) :: shared_data
real*4 w3(MAXFFT3)
real*4 s(NSMAX)
real*4 ssum(NSMAX)
real*4 xc(0:MAXFFT3-1)
real*4 tmp(NSMAX)
real*4 rmsnogain
complex cx(0:MAXFFT3/2)
integer nch(7)
common/spectra/syellow(NSMAX),ref(0:3456),filter(0:3456)
data rms/999.0/,k0/99999999/,nfft3z/0/
data nch/1,2,4,9,18,36,72/
equivalence (xc,cx)
save
if(ntrperiod.eq.-999) stop !Silence compiler warning
nfft3=16384 !df=12000.0/16384 = 0.732422
jstep=nsps/2 !Step size = half-symbol in id2()
if(k.gt.NMAX) go to 900
if(k.lt.2048) then !(2048 was nfft3) (Any need for this ???)
ihsym=0
go to 900 !Wait for enough samples to start
endif
if(nfft3.ne.nfft3z) then
! Compute new window
pi=4.0*atan(1.0)
width=0.25*nsps
do i=1,nfft3
z=(i-nfft3/2)/width
w3(i)=exp(-z*z)
enddo
nfft3z=nfft3
endif
if(k.lt.k0) then !Start a new data block
ja=0
ssum=0.
ihsym=0
if(.not. shared_data%params%ndiskdat) shared_data%id2(k+1:)=0 !Needed to prevent "ghosts". Not sure why.
endif
gain=10.0**(0.1*ingain)
sq=0.
pxmax=0.;
do i=k0+1,k
x1=shared_data%id2(i)
if (abs(x1).gt.pxmax) pxmax = abs(x1);
sq=sq + x1*x1
enddo
rmsnogain = 0.
if (sq.gt.0.0) rmsnogain=20*log10(sqrt(sq/(k-k0)))
sq=sq * gain
rms=sqrt(sq/(k-k0))
pxdb=0.
pxdbmax = 20*log10(pxmax)
if(rms.gt.0.0) pxdb=20.0*log10(rms)
if(pxdb.gt.90.0) pxdb=90.0
k0=k
ja=ja+jstep !Index of first sample
fac0=0.1
do i=0,nfft3-1 !Copy data into cx
j=ja+i-(nfft3-1)
xc(i)=0.
if(j.ge.1 .and.j.le.NMAX) xc(i)=fac0*shared_data%id2(j)
enddo
ihsym=ihsym+1
xc(0:nfft3-1)=w3(1:nfft3)*xc(0:nfft3-1) !Apply window w3
call four2a(xc,nfft3,1,-1,0) !Real-to-complex FFT
df3=12000.0/nfft3 !JT9-1: 0.732 Hz = 0.42 * tone spacing
iz=min(NSMAX,nint(5000.0/df3))
fac=(1.0/nfft3)**2
do i=1,iz
j=i-1
if(j.lt.0) j=j+nfft3
sx=fac*(real(cx(j))**2 + aimag(cx(j))**2)
if(ihsym.le.184) shared_data%ss(ihsym,i)=sx
ssum(i)=ssum(i) + sx
s(i)=1000.0*gain*sx
enddo
shared_data%savg=ssum/ihsym
if(mod(ihsym,10).eq.0) then
mode4=nch(nminw+1)
nsmo=min(10*mode4,150)
nsmo=4*nsmo
call flat1(shared_data%savg,iz,nsmo,syellow)
if(mode4.ge.2) call smo(syellow,iz,tmp,mode4)
if(mode4.ge.2) call smo(syellow,iz,tmp,mode4)
syellow(1:250)=0.
ia=500./df3
ib=2700.0/df3
smin=minval(syellow(ia:ib))
smax=maxval(syellow(1:iz))
syellow=(50.0/(smax-smin))*(syellow-smin)
where(syellow<0) syellow=0.
endif
900 npts8=k/8
return
end subroutine symspec