50 lines
1.2 KiB
Plaintext
50 lines
1.2 KiB
Plaintext
|
subroutine wav12(d2,d1,npts,nbitsam2)
|
||
|
|
|
||
|
|
! Convert i*2 or i*1 data at 11025 Hz (from WSJT *.wav files)
|
||
|
|
! to i*2 data at 12000 Hz.
|
||
|
|
|
||
|
|
! Input: i*2 d2(npts) or i*1 d1(npts)
|
||
|
|
! i*2 nbitsam2 = 8 or 16 (bits per sample)
|
||
|
|
|
||
|
|
! Output: npts = (12000*npts)/11025
|
||
|
|
! i*2 d2(npts)
|
||
|
|
|
||
|
|
parameter (NZ11=60*11025,NZ12=60*12000)
|
||
|
|
parameter (NFFT1=64*11025,NFFT2=64*12000)
|
||
|
|
integer*1 d1(NZ11)
|
||
|
|
integer*1 d1a(NZ11)
|
||
|
|
integer*1 i1
|
||
|
|
integer*2 i2
|
||
|
|
integer*2 d2(NZ12)
|
||
|
|
real x(NFFT2)
|
||
|
|
complex cx(0:NFFT2/2)
|
||
|
|
integer*2 nbitsam2
|
||
|
|
equivalence (x,cx),(i1,i2)
|
||
|
|
|
||
|
|
jz=min(NZ11,npts)
|
||
|
|
if(nbitsam2.eq.8) then
|
||
|
|
jz=min(NZ11,npts)
|
||
|
|
d1a(1:jz)=d1(1:jz) !d1 and d2 may be same array in calling prog
|
||
|
|
do i=1,jz !Move data from d1a into d2
|
||
|
|
i2=0
|
||
|
|
i1=d1a(i)
|
||
|
|
d2(i)=10*(i2-128)
|
||
|
|
enddo
|
||
|
|
endif
|
||
|
|
|
||
|
|
x(1:jz)=d2(1:jz)
|
||
|
|
x(jz+1:)=0.0
|
||
|
|
call four2a(x,nfft1,1,-1,0) !Forwarxd FFT, r2c
|
||
|
|
cx(nfft1/2:)=0.0
|
||
|
|
call four2a(cx,nfft2,1,1,-1) !Inverse FFT, c2r
|
||
|
|
|
||
|
|
npts=jz*12000.0/11025.0
|
||
|
|
fac=1.e-6
|
||
|
|
! if(nbitsam2.eq.16) fac=3.e-6
|
||
|
|
x=fac*x
|
||
|
|
d2(1:npts)=nint(x(1:npts))
|
||
|
|
if(npts.lt.NZ12) d2(npts+1:NZ12)=0
|
||
|
|
|
||
|
|
return
|
||
|
|
end subroutine wav12
|