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Diffstat (limited to 'lib/leanunconvert.c')
| -rw-r--r-- | lib/leanunconvert.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/lib/leanunconvert.c b/lib/leanunconvert.c deleted file mode 100644 index 4880729..0000000 --- a/lib/leanunconvert.c +++ /dev/null @@ -1 +0,0 @@ -#include "fftease.h"
/* unconvert essentially undoes what convert does, i.e., it
turns N2+1 PAIRS of amplitude and frequency values in
C into N2 PAIR of complex spectrum data (in rfft format)
in output array S; sampling rate R and interpolation factor
I are used to recompute phase values from frequencies */
void leanunconvert( float *C, float *S, int N2 )
{
double cos(), sin();
int real, imag,
amp, phase;
register int i;
for ( i = 0; i <= N2; i++ ) {
imag = phase = ( real = amp = i<<1 ) + 1;
S[real] = *(C+amp) * cos( *(C+phase) );
if ( i != N2 )
S[imag] = -*(C+amp) * sin( *(C+phase) );
}
}
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