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Add routines to create wave files for ft4slow.
This commit is contained in:
Steven Franke
parent
95d3f6acd0
commit
3085047a96
114
lib/fsk4hf/ft4slowsim.f90
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114
lib/fsk4hf/ft4slowsim.f90
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program ft4slowsim
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! Generate simulated signals for experimental slow FT4 mode
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use wavhdr
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use packjt77
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include 'wspr4_params.f90' !Set various constants
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type(hdr) h !Header for .wav file
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character arg*12,fname*17
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character msg37*37,msgsent37*37
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character c77*77
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complex c0(0:NMAX-1)
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complex c(0:NMAX-1)
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real wave(NMAX)
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integer itone(NN)
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integer*1 msgbits(101)
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integer*2 iwave(NMAX) !Generated full-length waveform
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! Get command-line argument(s)
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nargs=iargc()
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if(nargs.ne.7) then
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print*,'Usage: ft4slowsim "message" f0 DT fdop del nfiles snr'
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print*,'Examples: ft4slowsim "K1JT K9AN EN50" 1500 0.0 0.1 1.0 10 -15'
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go to 999
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endif
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call getarg(1,msg37) !Message to be transmitted
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call getarg(2,arg)
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read(arg,*) f0 !Frequency (only used for single-signal)
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call getarg(3,arg)
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read(arg,*) xdt !Time offset from nominal (s)
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call getarg(4,arg)
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read(arg,*) fspread !Watterson frequency spread (Hz)
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call getarg(5,arg)
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read(arg,*) delay !Watterson delay (ms)
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call getarg(6,arg)
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read(arg,*) nfiles !Number of files
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call getarg(7,arg)
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read(arg,*) snrdb !SNR_2500
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nfiles=abs(nfiles)
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twopi=8.0*atan(1.0)
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fs=12000.0 !Sample rate (Hz)
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dt=1.0/fs !Sample interval (s)
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hmod=1.0 !Modulation index (0.5 is MSK, 1.0 is FSK)
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tt=NSPS*dt !Duration of symbols (s)
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baud=1.0/tt !Keying rate (baud)
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txt=NZ2*dt !Transmission length (s)
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bandwidth_ratio=2500.0/(fs/2.0)
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sig=sqrt(2*bandwidth_ratio) * 10.0**(0.05*snrdb)
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if(snrdb.gt.90.0) sig=1.0
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call genft4slow(msg37,0,msgsent37,msgbits,itone)
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write(*,*)
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write(*,'(a9,a37,3x,a7,i1,a1,i1)') 'Message: ',msgsent37,'i3.n3: ',i3,'.',n3
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write(*,1000) f0,xdt,txt,snrdb
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1000 format('f0:',f9.3,' DT:',f6.2,' TxT:',f6.1,' SNR:',f6.1)
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write(*,*)
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if(i3.eq.1) then
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write(*,*) ' mycall hiscall hisgrid'
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write(*,'(28i1,1x,i1,1x,28i1,1x,i1,1x,i1,1x,15i1,1x,3i1)') msgbits(1:77)
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else
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write(*,'(a14)') 'Message bits: '
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write(*,'(50i1,1x,24i1)') msgbits
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endif
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write(*,*)
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write(*,'(a17)') 'Channel symbols: '
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write(*,'(10i1)') itone
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write(*,*)
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call sgran()
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fsample=12000.0
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icmplx=1
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call gen_wspr4wave(itone,NN,NSPS,fsample,f0,c0,wave,icmplx,NMAX)
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k=nint((xdt+1.0)/dt)-NSPS
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c0=cshift(c0,-k)
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if(k.gt.0) c0(0:k-1)=0.0
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if(k.lt.0) c0(NMAX+k:NMAX-1)=0.0
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do ifile=1,nfiles
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c=c0
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if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c,NMAX,NZ,fs,delay,fspread)
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c=sig*c
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wave=real(c)
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peak=maxval(abs(wave))
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nslots=1
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if(snrdb.lt.90) then
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do i=1,NMAX !Add gaussian noise at specified SNR
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xnoise=gran()
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wave(i)=wave(i) + xnoise
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enddo
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endif
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gain=100.0
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if(snrdb.lt.90.0) then
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wave=gain*wave
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else
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datpk=maxval(abs(wave))
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fac=32766.9/datpk
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wave=fac*wave
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endif
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if(any(abs(wave).gt.32767.0)) print*,"Warning - data will be clipped."
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iwave=nint(wave)
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h=default_header(12000,NMAX)
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write(fname,1102) ifile
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1102 format('000000_',i6.6,'.wav')
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open(10,file=fname,status='unknown',access='stream')
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write(10) h,iwave !Save to *.wav file
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close(10)
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write(*,1110) ifile,xdt,f0,snrdb,fname
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1110 format(i4,f7.2,f8.2,f7.1,2x,a17)
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enddo
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999 end program ft4slowsim
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93
lib/fsk4hf/genft4slow.f90
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93
lib/fsk4hf/genft4slow.f90
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@ -0,0 +1,93 @@
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subroutine genft4slow(msg0,ichk,msgsent,msgbits,i4tone)
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! Encode an FT4 message
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! Input:
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! - msg0 requested message to be transmitted
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! - ichk if ichk=1, return only msgsent
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! - msgsent message as it will be decoded
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! - i4tone array of audio tone values, {0,1,2,3}
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! Frame structure:
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! s16 + 87symbols + 2 ramp up/down = 105 total channel symbols
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! r1 + s4 + d29 + s4 + d29 + s4 + d29 + s4 + r1
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! Message duration: TxT = 105*13312/12000 = 116.48 s
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use packjt77
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include 'wspr4_params.f90'
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character*37 msg0
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character*37 message !Message to be generated
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character*37 msgsent !Message as it will be received
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character*77 c77
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character*24 c24
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integer*4 i4tone(NN),itmp(ND)
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integer*1 codeword(2*ND)
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integer*1 msgbits(101),rvec(77)
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integer icos4a(4),icos4b(4),icos4c(4),icos4d(4)
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integer ncrc24
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logical unpk77_success
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data icos4a/0,1,3,2/
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data icos4b/1,0,2,3/
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data icos4c/2,3,1,0/
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data icos4d/3,2,0,1/
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data rvec/0,1,0,0,1,0,1,0,0,1,0,1,1,1,1,0,1,0,0,0,1,0,0,1,1,0,1,1,0, &
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1,0,0,1,0,1,1,0,0,0,0,1,0,0,0,1,0,1,0,0,1,1,1,1,0,0,1,0,1, &
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0,1,0,1,0,1,1,0,1,1,1,1,1,0,0,0,1,0,1/
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message=msg0
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do i=1, 37
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if(ichar(message(i:i)).eq.0) then
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message(i:37)=' '
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exit
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endif
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enddo
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do i=1,37 !Strip leading blanks
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if(message(1:1).ne.' ') exit
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message=message(i+1:)
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enddo
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i3=-1
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n3=-1
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call pack77(message,i3,n3,c77)
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call unpack77(c77,0,msgsent,unpk77_success) !Unpack to get msgsent
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msgbits=0
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read(c77,'(77i1)') msgbits(1:77)
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call get_crc24(msgbits,101,ncrc24)
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write(c24,'(b24.24)') ncrc24
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read(c24,'(24i1)') msgbits(78:101)
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if(ichk.eq.1) go to 999
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if(unpk77_success) go to 2
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1 msgbits=0
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itone=0
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msgsent='*** bad message *** '
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go to 999
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entry get_ft4slow_tones_from_101bits(msgbits,i4tone)
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2 call encode174_101(msgbits,codeword)
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! Grayscale mapping:
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! bits tone
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! 00 0
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! 01 1
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! 11 2
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! 10 3
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do i=1,ND
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is=codeword(2*i)+2*codeword(2*i-1)
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if(is.le.1) itmp(i)=is
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if(is.eq.2) itmp(i)=3
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if(is.eq.3) itmp(i)=2
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enddo
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i4tone(1:4)=icos4a
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i4tone(5:33)=itmp(1:29)
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i4tone(34:37)=icos4b
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i4tone(38:66)=itmp(30:58)
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i4tone(67:70)=icos4c
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i4tone(71:99)=itmp(59:87)
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i4tone(100:103)=icos4d
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999 return
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end subroutine genft4slow
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