def test_resampy(self):
old_sr = 3
new_sr = 2
x = pure_tone(7, sr=128, dur=3) + pure_tone(24, sr=128, dur=3)
y_re = th.from_numpy(resampy.resample(x.numpy(), old_sr,
new_sr)).float()
y = resample.resample_frac(x, old_sr, new_sr)
self.assertSimilar(y, y_re, x, f"{old_sr} to {new_sr}")
old_sr = 2
new_sr = 5
x = pure_tone(7, sr=128) + pure_tone(48, sr=128)
y_re = th.from_numpy(resampy.resample(x.numpy(), old_sr,
new_sr)).float()
y = resample.resample_frac(x, old_sr, new_sr)
self.assertSimilar(y, y_re, x, f"{old_sr} to {new_sr}")
random.seed(1234)
th.manual_seed(1234)
for _ in range(10):
old_sr = random.randrange(8, 128)
new_sr = random.randrange(8, 128)
x = th.randn(1024)
y_re = th.from_numpy(resampy.resample(x.numpy(), old_sr,
new_sr)).float()
y = resample.resample_frac(x, old_sr, new_sr, zeros=56)
# We allow some relatively high tolerance as we are not using the same window.
self.assertSimilar(y, y_re, x, f"{old_sr} to {new_sr}", tol=2)
def test_full(self):
x = th.randn(19)
y = resample.resample_frac(x, 7, 1, full=True)
self.assertEqual(len(y), 3)
z = resample.resample_frac(y, 5, 1, full=True)
y2 = resample.resample_frac(z, 1, 5, full=True)
x2 = resample.resample_frac(y2, 1, 7, output_length=len(x))
self.assertEqual(x.shape, x2.shape)
def test_custom_output_length_out_of_range(self):
x = th.ones(1, 32000)
with self.assertRaisesRegex(
ValueError, "output_length must be between 0 and 48000"):
resample.resample_frac(x,
old_sr=32000,
new_sr=48000,
output_length=48002)
def test_ref(self):
# Compare to _upsample2 and _downsample2
for freq in [8, 16, 20, 28, 32, 36, 40, 56, 64]:
x = pure_tone(freq, sr=128)
y_gt_down = resample._downsample2(x)
y_down = resample.resample_frac(x, 2, 1, rolloff=1)
self.assertSimilar(y_down, y_gt_down, x, f"freq={freq} down")
y_gt_up = resample._upsample2(x)
y_up = resample.resample_frac(x, 1, 2, rolloff=1)
self.assertSimilar(y_up, y_gt_up, x, f"freq={freq} up")
def test_default_output_length(self):
x = th.ones(1, 2, 32000)
resampler = resample.ResampleFrac(old_sr=32000, new_sr=48000)
y = resampler(x)
self.assertEqual(y.shape, (1, 2, 48000))
# Test functional version as well
y = resample.resample_frac(x, old_sr=32000, new_sr=48000)
self.assertEqual(y.shape, (1, 2, 48000))
def test_constant(self):
x = th.ones(4096)
for zeros in [4, 10]:
for old_sr in [1, 4, 10]:
for new_sr in [1, 4, 10]:
y_low = resample.resample_frac(x,
old_sr,
new_sr,
zeros=zeros)
self.assertLessEqual((y_low - 1).abs().mean(), 1e-6,
(zeros, old_sr, new_sr))
def test_custom_output_length(self):
x = th.ones(1, 32001)
resampler = resample.ResampleFrac(old_sr=32000, new_sr=48000)
y = resampler(x, output_length=48001)
self.assertEqual(y.shape, (1, 48001))
# Test functional version as well
y = resample.resample_frac(x,
old_sr=32000,
new_sr=48000,
output_length=47999)
self.assertEqual(y.shape, (1, 47999))
def test_custom_output_length_extreme_resampling(self):
"""
Resample a signal from 1 hz to 499 hz to check that custom_length works
correctly without extra internal padding
"""
x = th.ones(1, 1)
resampler = resample.ResampleFrac(old_sr=1, new_sr=499)
y = resampler(x, output_length=499)
self.assertEqual(y.shape, (1, 499))
# Test functional version as well
y = resample.resample_frac(x, old_sr=1, new_sr=499, output_length=3)
self.assertEqual(y.shape, (1, 3))