50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include "celt_types.h"
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#include "bands.h"
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#include <math.h>
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#define MAX_SIZE 100
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int ret=0;
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void test_rotation(int N, int K)
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{
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int i;
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double err = 0, ener = 0, snr, snr0;
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celt_word16 x0[MAX_SIZE];
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celt_word16 x1[MAX_SIZE];
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int nb_rotations = (N+4*K)/(8*K);
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for (i=0;i<N;i++)
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x1[i] = x0[i] = rand()%32767-16384;
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exp_rotation(x1, N, 1, 1, nb_rotations);
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for (i=0;i<N;i++)
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{
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err += (x0[i]-(double)x1[i])*(x0[i]-(double)x1[i]);
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ener += x0[i]*(double)x0[i];
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}
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snr0 = 20*log10(ener/err);
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err = ener = 0;
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exp_rotation(x1, N, -1, 1, nb_rotations);
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for (i=0;i<N;i++)
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{
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err += (x0[i]-(double)x1[i])*(x0[i]-(double)x1[i]);
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ener += x0[i]*(double)x0[i];
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}
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snr = 20*log10(ener/err);
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printf ("SNR for size %d (%d pulses) is %f (was %f without inverse)\n", N, K, snr, snr0);
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if (snr < 60 || snr0 > 20)
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ret = 1;
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}
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int main(void)
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{
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test_rotation(15, 3);
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test_rotation(23, 5);
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test_rotation(50, 3);
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test_rotation(80, 1);
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return ret;
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}
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