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wip: MDCT, SNS in fixed point

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This commit is contained in:
Antoine Soulier
2023-04-14 14:47:31 -07:00
parent 2ce884d8ef
commit 82db8e05ae
16 changed files with 2526 additions and 2187 deletions
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10
tables/mktables.py
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@@ -104,8 +104,8 @@ def mdct_fft_twiddles():
kv = -2 * np.pi * np.arange(n // 2) / n
for (i, k) in enumerate(kv):
print('{{ {:14.7e}, {:14.7e} }},'.format(np.cos(k), np.sin(k)),
end = '\n' if i%2 == 1 else ' ')
print('{{ {:14.7e}, {:14.7e} }},'.format(
np.cos(k) / np.sqrt(2), np.sin(k) / np.sqrt(2)))
for n in (15, 45):
@@ -115,7 +115,8 @@ def mdct_fft_twiddles():
for k in kv:
print(('{{ {{ {:14.7e}, {:14.7e} }},' +
' {{ {:14.7e}, {:14.7e} }} }},').format(
np.cos(k), np.sin(k), np.cos(2*k), np.sin(2*k)))
np.cos( k) / np.sqrt(3), np.sin( k) / np.sqrt(3),
np.cos(2*k) / np.sqrt(3), np.sin(2*k) / np.sqrt(3)))
def mdct_rot_twiddles():
@@ -126,8 +127,7 @@ def mdct_rot_twiddles():
kv = 2 * np.pi * (np.arange(n // 4) + 1/8) / n
for (i, k) in enumerate(kv):
print('{{ {:14.7e}, {:14.7e} }},'.format(np.cos(k), np.sin(k)),
end = '\n' if i%2 == 1 else ' ')
print('{{ {:14.7e}, {:14.7e} }},'.format(np.cos(k), np.sin(k)))
def mdct_scaling():