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Roll off the extracted spectrum below 500 Ha and above 2500 Hz.

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This commit is contained in:
Joe Taylor 2021-05-02 13:51:01 -04:00
parent 54882b57b9
commit e79a6b80f4
1 changed files with 32 additions and 11 deletions
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43
map65/libm65/q65b.f90
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@ -1,6 +1,14 @@
subroutine q65b(nutc,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
mycall0,hiscall0,hisgrid,mode_q65)
! This routine provides an interface between MAP65 and the Q65 decoder
! in WSJT-X. All arguments are input data obtained from the MAP65 GUI.
! Raw Rx data are available as the 96 kHz complex spectrum ca(MAXFFT1)
! in common/cacb. If xpol is true, we also have cb(MAXFFT1) for the
! orthogonal polarization. Decoded messages are sent back to the GUI
! on stdout.
! use wavhdr
use q65_decode
use wideband_sync
use timer_module, only: timer
@ -8,6 +16,7 @@ subroutine q65b(nutc,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
parameter (MAXFFT1=5376000) !56*96000
parameter (MAXFFT2=336000) !56*6000 (downsampled by 1/16)
parameter (NMAX=60*12000)
! type(hdr) h !Header for the .wav file
integer*2 iwave(60*12000)
complex ca(MAXFFT1),cb(MAXFFT1) !FFTs of raw x,y data
complex cx(0:MAXFFT2-1),cy(0:MAXFFT2-1),cz(0:MAXFFT2)
@ -24,7 +33,7 @@ subroutine q65b(nutc,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
save
open(9,file='wsjtx_dir.txt',status='old')
read(9,'(a)') wsjtx_dir
read(9,'(a)') wsjtx_dir !Establish the working directory
close(9)
if(mycall0(1:1).ne.' ') mycall=mycall0
@ -57,12 +66,10 @@ subroutine q65b(nutc,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
if(k0.lt.nh .or. k0.gt.nfft1-nh) go to 900
fac=1.0/nfft2
cx(0:nh)=ca(k0:k0+nh)
cx(nh+1:nfft2-1)=ca(k0-nh+1:k0-1)
cx(0:nfft2-1)=ca(k0:k0+nfft2-1)
cx=fac*cx
if(xpol) then
cy(0:nh)=cb(k0:k0+nh)
cy(nh+1:nfft2-1)=cb(k0-nh+1:k0-1)
cy(0:nfft2-1)=cb(k0:k0+nfft2-1)
cy=fac*cy
endif
@ -82,14 +89,32 @@ subroutine q65b(nutc,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
if(ipol.eq.3) cz(0:MAXFFT2-1)=cy
if(ipol.eq.4) cz(0:MAXFFT2-1)=0.707*(cx-cy)
cz(MAXFFT2)=0.
! Roll off below 500 Hz and above 2500 Hz.
ja=nint(500.0/df)
jb=nint(2500.0/df)
do i=0,ja
r=0.5*(1.0+cos(i*3.14159/ja))
cz(ja-i)=r*cz(ja-i)
cz(jb+i)=r*cz(jb+i)
enddo
cz(ja+jb+1:)=0.
!Transform to time domain (real), fsample=12000 Hz
call four2a(cz,2*nfft2,1,1,-1)
do i=0,nfft2-1
j=nfft2-1-i
iwave(2*i+1)=nint(real(cz(j)))
iwave(2*i+2)=nint(aimag(cz(j)))
iwave(2*i+2)=nint(real(cz(j))) !Note the reversed order!
iwave(2*i+1)=nint(aimag(cz(j)))
enddo
iwave(2*nfft2+1:)=0
!###
! h=default_header(12000,NMAX)
! open(60,file='000000_0001.wav',access='stream',status='unknown')
! write(60) h,iwave
! close(60)
!###
nsubmode=mode_q65-1
nfa=max(100,1000-ntol)
nfb=min(4900,1000+ntol)
@ -106,10 +131,6 @@ subroutine q65b(nutc,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
nfreq=nfreq0 + nhz + mousedf - 1000
freq0=144.0 + 0.001*ikhz
if(nsnr0.gt.-99) then
! write(71,3071) mousedf,ntol,ia,ib,ifreq,ipk,ikhz,nfreq,nsnr0,xdt0,freq0,trim(msg0)
!3071 format(9i6,f6.2,f9.3,1x,a)
! write(72,3072) mousedf,nfa,nfb,nfreq,ifreq,ipk,ipk-ifreq,nhz,(ipk-ifreq)*dff
!3072 format(8i6,f7.1)
write(line,1020) ikhz,nfreq,45*(ipol-1),nutc,xdt0,nsnr0,msg0(1:27),cq0
1020 format('!',i3.3,i5,i4,i6.4,f5.1,i5,' : ',a27,a3)
write(*,1100) trim(line)