2021-04-22 14:04:08 -04:00
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subroutine gen_q65_wave(msg,ntxfreq,mode65,msgsent,iwave,nwave)
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2021-04-07 13:12:53 -04:00
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2021-05-06 11:30:38 -04:00
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! Encodes a Q65 message to yield complex iwave() at fsample = 11025 Hz
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2021-04-07 13:12:53 -04:00
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use packjt
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2021-05-06 11:27:43 -04:00
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use q65_encoding
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2021-04-07 13:12:53 -04:00
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parameter (NMAX=2*60*11025)
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2021-04-07 13:49:53 -04:00
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character*22 msg
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2021-04-07 13:12:53 -04:00
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character*22 msgsent !Message as it will be received
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2021-05-06 11:27:43 -04:00
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character*37 msg37
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2021-04-07 13:49:53 -04:00
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real*8 t,dt,phi,f,f0,dfgen,dphi,twopi,tsym
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2021-05-06 11:27:43 -04:00
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integer codeword(65),itone(85)
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2021-04-07 13:12:53 -04:00
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integer*2 iwave(NMAX)
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integer icos7(0:6)
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data icos7/2,5,6,0,4,1,3/ !Defines a 7x7 Costas array
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2021-04-22 14:56:57 -04:00
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data twopi/6.283185307179586476d0/
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2021-04-07 13:12:53 -04:00
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save
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2021-04-07 13:49:53 -04:00
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msgsent=msg
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2021-05-06 11:27:43 -04:00
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msg37=''
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msg37(1:22)=msg
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call get_q65_tones(msg37,codeword,itone)
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2021-04-07 13:12:53 -04:00
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! Set up necessary constants
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2021-04-07 13:49:53 -04:00
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nsym=85
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tsym=7200.d0/12000.d0
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dt=1.d0/11025.d0
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f0=ntxfreq
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2021-04-07 13:49:53 -04:00
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ndf=2**(mode65-1)
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dfgen=ndf*12000.d0/7200.d0
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2021-04-07 13:12:53 -04:00
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phi=0.d0
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dphi=twopi*dt*f0
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i=0
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2021-04-07 13:49:53 -04:00
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iz=85*7200*11025.d0/12000.d0
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2021-04-07 13:12:53 -04:00
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t=0.d0
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j0=0
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do i=1,iz
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t=t+dt
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j=t/tsym
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if(j.ne.j0) then
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f=f0 + itone(j)*dfgen
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dphi=twopi*dt*f
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j0=j
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endif
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phi=phi+dphi
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if(phi.gt.twopi) phi=phi-twopi
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xphi=phi
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iwave(2*i-1)=32767.0*cos(xphi)
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iwave(2*i)=32767.0*sin(xphi)
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enddo
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nwave=2*iz
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999 return
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2021-04-07 13:12:53 -04:00
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end subroutine gen_q65_wave
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