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Improving the accuracy of the fixed-point radix-3 and radix-5

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This commit is contained in:
Jean-Marc Valin 2013-12-31 00:00:37 -05:00
parent e1f846208e
commit c8f62a4aed
1 changed files with 14 additions and 3 deletions
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17
celt/kiss_fft.c
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@ -167,7 +167,12 @@ static void kf_bfly3(
kiss_twiddle_cpx epi3;
kiss_fft_cpx * Fout_beg = Fout;
#ifdef FIXED_POINT
epi3.r = -16384;
epi3.i = -28378;
#else
epi3 = st->twiddles[fstride*m];
#endif
for (i=0;i<N;i++)
{
Fout = Fout_beg + i*mm;
@ -215,13 +220,19 @@ static void kf_bfly5(
kiss_fft_cpx *Fout0,*Fout1,*Fout2,*Fout3,*Fout4;
int i, u;
kiss_fft_cpx scratch[13];
const kiss_twiddle_cpx * twiddles = st->twiddles;
const kiss_twiddle_cpx *tw;
kiss_twiddle_cpx ya,yb;
kiss_fft_cpx * Fout_beg = Fout;
ya = twiddles[fstride*m];
yb = twiddles[fstride*2*m];
#ifdef FIXED_POINT
ya.r = 10126;
ya.i = -31164;
yb.r = -26510;
yb.i = -19261;
#else
ya = st->twiddles[fstride*m];
yb = st->twiddles[fstride*2*m];
#endif
tw=st->twiddles;
for (i=0;i<N;i++)