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/liblc3-latest/test/
Dmdct.py66 z = t * np.exp(-2j * np.pi * np.arange(n) / (2*n))
67 z = scipy.fft.fft(z)[:n2]
68 z = z * np.exp(-2j * np.pi *
70 return np.real(z) * np.sqrt(2/n2)
87 z = x * np.exp(2j * np.pi * (n/2 + 0.5) * np.arange(2*n) / (2*n))
88 z = scipy.fft.ifft(z) * n
89 z = z * np.exp(2j * np.pi * (np.arange(2*n) + (n/2 + 0.5)) / (4*n))
90 t = np.real(z) * np.sqrt(2/n)
/liblc3-latest/src/
Dmdct.c439 struct lc3_complex *z = (struct lc3_complex *)y; in lc3_mdct_forward() local
440 union { float *f; struct lc3_complex *z; } u = { .z = buffer }; in lc3_mdct_forward() member
444 mdct_pre_fft(rot, u.f, u.z); in lc3_mdct_forward()
445 u.z = fft(u.z, ns/2, u.z, z); in lc3_mdct_forward()
446 mdct_post_fft(rot, u.z, y); in lc3_mdct_forward()
464 struct lc3_complex *z = (struct lc3_complex *)y; in lc3_mdct_inverse() local
465 union { float *f; struct lc3_complex *z; } u = { .z = buffer }; in lc3_mdct_inverse() member
467 imdct_pre_fft(rot, x, z); in lc3_mdct_inverse()
468 z = fft(z, ns/2, z, u.z); in lc3_mdct_inverse()
469 imdct_post_fft(rot, z, u.f); in lc3_mdct_inverse()
Dspec.c722 int i, ns = 0, z = 0; in estimate_noise() local
725 z = fabsf(x[i]) < xq_lim ? z + 1 : 0; in estimate_noise()
726 if (z > 2*w) in estimate_noise()
731 if (++z > 2*w) in estimate_noise()
753 int i, z = 0; in fill_noise() local
756 z = x[i] ? 0 : z + 1; in fill_noise()
757 if (z > 2*w) { in fill_noise()
764 if (++z > 2*w) { in fill_noise()