def calcConsts(cls, fam, famOnly=False):
consts = [ fam.pi ]
if not famOnly:
consts.append(6 * FXnum(0.5, fam).asin())
consts.append(4 * ( 4 * (1 / FXnum(5, fam)).atan()
- (1 / FXnum(239, fam)).atan() ))
return consts
def testIntRange(self):
"""Check detection of overflow of integer part."""
for top in [-3, -2, 0, 2, 4, 6]:
fam = FXfamily(16, top)
a = FXnum(1.0 / 16.01, fam)
zero = FXnum(0, fam)
limit = 1 << (top + 4 - 1) # Unlikely to be valid FXnum(,fam)
cnt, x, y = 0, zero, zero
while cnt < (limit + 5):
cnt += 1
try:
x += a
except FXoverflowError:
if cnt <= limit: self.fail()
else:
if cnt > limit: self.fail()
try:
y -= a
except FXoverflowError:
if cnt <= limit: self.fail()
else:
if cnt > limit: self.fail()
def testFamilyProtection(self):
"""Check that arithmetic operators do not transmute resolution families"""
famlist = [FXfamily(res) for res in [8, 16, 40, 90]]
for fam0 in famlist:
for fam1 in famlist:
x = FXnum(2, fam0)
y = FXnum(3, fam1)
try:
a = x + y
except FXfamilyError:
self.assertFalse(fam0 is fam1)
else:
self.assertTrue(fam0 is fam1)
try:
a = x - y
except FXfamilyError:
self.assertFalse(fam0 is fam1)
else:
self.assertTrue(fam0 is fam1)
try:
a = x * y
except FXfamilyError:
self.assertFalse(fam0 is fam1)
else:
self.assertTrue(fam0 is fam1)
try:
a = x / y
except FXfamilyError:
self.assertFalse(fam0 is fam1)
else:
self.assertTrue(fam0 is fam1)
def testMultiplication(self):
"""Multiplication operators should promote & commute"""
scale = 0.25
scale2 = scale * scale
for x in range(-16, 32):
fpx = FXnum(x * scale)
for y in range(-32, 16):
fpy = FXnum(y * scale)
fpa = FXnum((x * y) * scale2)
# compute various forms of a = (x * y):
self.assertEqual(fpa, fpx * fpy)
self.assertEqual(fpa, fpy * fpx)
self.assertEqual((x * y) * scale2, float(fpx * fpy))
tmp = fpx
tmp *= fpy
self.assertEqual(fpa, tmp)
tmp = float(x * scale) * fpy
self.assertEqual(fpa, tmp)
tmp = fpx * float(y * scale)
self.assertEqual(fpa, tmp)
def testDivision(self):
"""Division operators should promote & inverse-commute"""
fam62 = FXfamily(62)
scale = 0.125
scale2 = scale * scale
for a in range(-32, 32):
if a == 0: continue
fpa = FXnum(a * scale, fam62)
for y in range(-16, 16):
if y == 0: continue
fpy = FXnum(y * scale, fam62)
fpx = FXnum((y * a) * scale2, fam62)
# compute various forms of a = (x / y):
self.assertAlmostEqual(fpa, fpx / fpy)
self.assertAlmostEqual(1 / fpa, fpy / fpx)
self.assertAlmostEqual((a * scale), float(fpx / fpy))
tmp = fpx
tmp /= fpy
self.assertAlmostEqual(fpa, tmp)
tmp = float(a * y * scale2) / fpy
self.assertAlmostEqual(fpa, tmp)
tmp = fpx / float(y * scale)
self.assertAlmostEqual(fpa, tmp)
def testBoolConditions(self):
"""Values used in boolean expressions should behave as true/false"""
if FXnum(0):
self.fail()
if FXnum(1):
pass
else:
self.fail()
def testRawBuild(self):
"""Check equivalence of FXnum._rawbuild() and FXnum()."""
fam = FXfamily(10, 5)
x = FXnum(val=9.7531, family=fam)
xraw = FXnum._rawbuild(fam, x.scaledval)
self.assertEqual(x, xraw)
self.assertIsInstance(x, FXnum)
self.assertIsInstance(xraw, FXnum)
self.assertIsNot(x, xraw)
def testRepresentation(self):
"""Check repr() functionality"""
for i in range(1, 30):
v = 1.7**i
for x in [v, -v, 1.0 / v, -1.0 / v]:
fp0 = FXnum(x)
# ensure that value extracted via repr() is in same FXfamily:
fpb = FXnum(eval(repr(fp0)), family=fp0.family)
self.assertEqual(fp0, fpb)
def testPrinting(self):
"""Check conversion to string"""
for i in range(1, 10):
v = 2**i
for x in [v, -v, 1.0 / v, -1.0 / v]:
plainstr = "%.8g" % x
fpx = FXnum(x)
self.assertEqual('{:.8g}'.format(x), str(fpx))
self.assertEqual(str(fpx), fpx.toDecimalString())
def testExpLog(self):
"""exp and log methods should be inverses & agree with math.*"""
fam62 = FXfamily(62)
scale = 0.27
for i in range(-32, 32):
x = i * scale
exp = FXnum(x, fam62).exp()
logexp = exp.log()
self.assertAlmostEqual(x, float(logexp))
def testExpLog(self):
"""exp and log methods should be inverses & agree with math.*"""
fam62 = FXfamily(62)
scale = 0.27
for i in range(-32, 32):
x = i * scale
exp = FXnum(x, fam62).exp()
logexp = exp.log()
self.assertAlmostEqual(x, float(logexp))
def testPrinting(self):
"""Check conversion to string"""
for i in range(1, 10):
v = 2 ** i
for x in [v, -v, 1.0/v, -1.0/v]:
plainstr = "%.8g" % x
fpx = FXnum(x)
self.assertEqual('{:.8g}'.format(x), str(fpx))
self.assertEqual(str(fpx), fpx.toDecimalString())
def testArctan(self):
"""atan method agree with math.sin/cos"""
fam62 = FXfamily(62)
scale = 0.277
self.assertEqual(FXnum(0, fam62), 0)
for i in range(-32, 32):
tan = i * scale
ang_true = math.atan(tan)
ang = FXnum(tan, fam62).atan()
self.assertAlmostEqual(ang_true, ang)
self.assertAlmostEqual(float(ang.tan()), tan)
def testArctan(self):
"""atan method agree with math.sin/cos"""
fam62 = FXfamily(62)
scale = 0.277
self.assertEqual(FXnum(0, fam62), 0)
for i in range(-32, 32):
tan = i * scale
ang_true = math.atan(tan)
ang = FXnum(tan, fam62).atan()
self.assertAlmostEqual(ang_true, ang)
self.assertAlmostEqual(float(ang.tan()), tan)
def testNegating(self):
"""Check prefix operators"""
fam17 = FXfamily(17)
for i in range(-32, 32):
x = i * 0.819
fx = FXnum(x, fam17)
zero = FXnum(0, fam17)
try:
self.assertEqual(zero, fx + (-fx))
self.assertEqual(zero, -fx + fx)
self.assertEqual((-1 * fx), -fx)
self.assertEqual(zero, (-1 * fx) + (-fx) + 2 * (+fx))
except FXexception:
self.fail()
def next_sample(self, fcw: int) -> NCOType:
lut_index = (self.phase_acc >> (self.N - self.M)) & int(
'1' * self.M, 2) # take MSB M bits of phase_acc
samples = []
for lut in [
self.sine_lut_fixed, self.square_lut_fixed,
self.triangle_lut_fixed, self.sawtooth_lut_fixed
]:
if self.interpolate is False:
samples.append(lut[lut_index])
else:
samp1 = lut[lut_index]
samp2 = lut[(lut_index + 1) % self.lut_entries]
residual = self.phase_acc & int(
'1' *
(self.N - self.M), 2) # take LSB (N-M) bits of phase_acc
residual = FXnum(
residual / (2**(self.N - self.M)),
family=self.output_type) # Cast residual as fixed point
diff = samp2 - samp1
samples.append(samp1 + residual * diff)
self.phase_acc = self.phase_acc + fcw
self.phase_acc = self.phase_acc % 2**self.N # overflow on N bits
return samples
def testPow(self):
"""Check raising FXnums to powers."""
fam62 = FXfamily(62)
scale = 0.205
scale2 = 0.382
for i in range(1, 32):
x = i * scale
pwr = FXnum(0, fam62)**x
self.assertEqual(FXnum(1, fam62), pwr)
for j in range(-16, 16):
y = j * scale2
pwr_true = math.pow(x, y)
pwr = FXnum(x, fam62)**y
self.assertAlmostEqual(pwr_true, pwr)
def testArcSinCos(self):
"""asin/acos methods should be inverses of sin/cos"""
fam62 = FXfamily(62)
trig = FXnum(0, fam62)
self.assertEqual(trig, trig.asin())
self.assertEqual(trig, FXnum(1,fam62).acos())
steps = 20
for i in range(0, steps + 1):
for s in [-1.0, 1.0]:
trig = FXnum((i * s) / steps, fam62)
isn = trig.asin()
self.assertTrue(abs(isn) <= fam62.pi / 2)
self.assertAlmostEqual(float(trig), float(isn.sin()))
ics = trig.acos()
self.assertTrue(0 <= ics and ics <= fam62.pi)
self.assertAlmostEqual(float(trig), float(ics.cos()))
def testSqrt(self):
"""sqrt method should find square-roots"""
fam62 = FXfamily(62)
scale = 0.94
for i in range(-40, 40):
x = i * scale
fx = FXnum(x, fam62)
try:
rt = fx.sqrt()
except FXdomainError:
self.assertFalse(x >= 0)
else:
rt2 = float(rt * rt)
self.assertAlmostEqual(x, rt2)
if i == 0:
self.assertEqual(FXnum(0, fam62), rt)
def next_sample(self) -> int:
nco_out = self.nco.next_sample_f(self.note_freq)
summer_out = self.summer.next_sample(nco_out)
if self.playing_note:
return summer_out
else:
return FXnum(0, output_type)
def testSqrt(self):
"""sqrt method should find square-roots"""
fam62 = FXfamily(62)
scale = 0.94
for i in range(-40, 40):
x = i * scale
fx = FXnum(x, fam62)
try:
rt = fx.sqrt()
except FXdomainError:
self.assertFalse(x >= 0)
else:
rt2 = float(rt * rt)
self.assertAlmostEqual(x, rt2)
if i == 0:
self.assertEqual(FXnum(0, fam62), rt)
def testDecimalRound(self):
third = FXnum(1, FXfamily(200)) / 3
x23 = 2 * third
self.assertEqual(third.toDecimalString(precision=5), '0.33333')
self.assertEqual(third.toDecimalString(precision=8, round10=True),
'0.33333333')
self.assertEqual(x23.toDecimalString(precision=4), '0.6666')
self.assertEqual(x23.toDecimalString(precision=7, round10=True),
'0.6666667')
self.assertEqual(x23.toDecimalString()[:42], '0.' + '6' * 40)
self.assertEqual(x23.toDecimalString(precision=50), '0.' + '6' * 50)
self.assertEqual(x23.toDecimalString(precision=50, round10=True),
'0.' + '6' * 49 + '7')
def testBinarySeries(self):
"""Check binary printing of enumerated signed integers."""
for res in range(1, 5):
fam = FXfamily(res)
for scaled in range(1 << (res + 4)):
pos = FXnum(family=fam, scaled_value=scaled)
for sign in ((1, -1) if scaled > 0 else (1, )):
printed = (sign * pos).toBinaryString()
if sign > 0:
x = scaled
else:
if scaled < (1 << res):
shift = res + 1
else:
shift = math.ceil(math.log2(scaled)) + 1
x = (1 << shift) - scaled
binstr = bin(x)[2:]
pad = res + 1 - len(binstr)
if pad > 0: binstr = '0' * pad + binstr
binstr = binstr[:-res] + '.' + binstr[-res:]
self.assertEqual(binstr, printed,
'Binary printing failed for {}, res={}' \
.format(float(sign * pos), res))
def testPrinting(self):
"""Check conversion to string"""
for i in range(1, 10):
v = 2**i
for x in [v, -v, 1.0 / v, -1.0 / v]:
fpa = "%.8g" % x
fpx = str(FXnum(x))
self.assertEqual(fpa, fpx)
def testSinCos(self):
"""sin/cos methods agree with math.sin/cos"""
fam62 = FXfamily(62)
scale = 0.342
fang = FXnum(0, fam62)
self.assertEqual(fang, fang.sin())
self.assertEqual(FXnum(1, fam62), fang.cos())
for i in range(-32, 32):
x = i * scale
sin_true = math.sin(x)
cos_true = math.cos(x)
fang = FXnum(x, fam62)
(sin, cos) = fang.sincos()
self.assertAlmostEqual(sin_true, sin)
self.assertAlmostEqual(cos_true, cos)
self.assertEqual(sin, fang.sin())
self.assertEqual(cos, fang.cos())
def testNegatives(self):
fam = FXfamily(3)
x2 = FXnum(-0.25, fam)
self.assertEqual(x2.toBinaryString(), '1.110')
self.assertEqual(x2.toBinaryString(twosComp=False), '-0.010')
x3 = FXnum(-0.625, fam)
self.assertEqual(x3.toBinaryString(logBase=3), '7.3')
self.assertEqual(x3.toBinaryString(3, twosComp=False), '-0.5')
x4 = FXnum(-0.875, fam)
self.assertEqual(x4.toBinaryString(4), 'f.2')
self.assertEqual(x4.toBinaryString(4, twosComp=False), '-0.e')
def testDecimalRound(self):
third = FXnum(1, FXfamily(200)) / 3
x23 = 2 * third
self.assertEqual(third.toDecimalString(precision=5), '0.33333')
self.assertEqual(third.toDecimalString(precision=8, round10=True),
'0.33333333')
self.assertEqual(x23.toDecimalString(precision=4), '0.6666')
self.assertEqual(x23.toDecimalString(precision=7, round10=True),
'0.6666667')
self.assertEqual(x23.toDecimalString()[:42],
'0.' + '6'*40)
self.assertEqual(x23.toDecimalString(precision=50),
'0.' + '6'*50)
self.assertEqual(x23.toDecimalString(precision=50, round10=True),
'0.' + '6' * 49 + '7')
def testFamilyConversion(self):
"""Check that conversion between families preserves values"""
famlist = [FXfamily(b) for b in [32, 40, 48, 80, 120]]
for i in range(1, 10):
xpos = (float)(1 << (2 * i)) + 1.0 / (1 << i)
for x in [xpos, -xpos]:
for fam0 in famlist:
fp0 = FXnum(x, fam0)
for fam1 in famlist:
fp1 = FXnum(fp0, fam1)
try:
f = (fp0 == fp1)
except FXfamilyError:
self.assertFalse(fam0 is fam1)
else:
self.assertTrue(fam0 is fam1)
self.assertAlmostEqual(x, float(fp0))
self.assertAlmostEqual(x, float(fp1))
def testRawBuild(self):
"""Check equivalence of FXnum._rawbuild() and FXnum()."""
fam = FXfamily(10, 5)
x = FXnum(val=9.7531, family=fam)
xraw = FXnum._rawbuild(fam, x.scaledval)
self.assertEqual(x, xraw)
self.assertIsInstance(x, FXnum)
self.assertIsInstance(xraw, FXnum)
self.assertIsNot(x, xraw)
def testExp(self):
"""Exponent method should agree with math.exp"""
fam62 = FXfamily(62)
scale = 0.23
for i in range(-32, 32):
x = i * scale
exp_true = math.exp(x)
exp = FXnum(x, fam62).exp()
self.assertAlmostEqual(exp_true, exp)
def testNumCreateRounding(self):
"""Check rounding behaviour on FXnum creation"""
fam = FXfamily(3)
self.assertEqual(FXnum(0.375, fam).scaledval, 3)
self.assertEqual(FXnum(0.437, fam).scaledval, 3)
self.assertEqual(FXnum(0.438, fam).scaledval, 4)
self.assertEqual(FXnum(0.46, fam).scaledval, 4)
fam = FXfamily(4)
self.assertEqual(FXnum(-0.75, fam).scaledval, -12)
self.assertEqual(FXnum(-0.78124, fam).scaledval, -12)
self.assertEqual(FXnum(-0.78126, fam).scaledval, -13)
self.assertEqual(FXnum(-0.8125, fam).scaledval, -13)
def testLog(self):
"""Logarithm method agree with math.log"""
fam62 = FXfamily(62)
base = 1.5
for i in range(1, 32):
for j in range(0, 2):
if j == 0:
x = 1.0 / (base**i)
else:
x = base**i
log_true = math.log(x)
log = FXnum(x, fam62).log()
self.assertAlmostEqual(log_true, log)
def __init__(self, fsamp: float, interpolate: bool) -> None:
self.fsamp = fsamp
self.interpolate = interpolate
self.output_type = output_type
self.phase_acc = 0 # type: int
self.N = 24
self.M = 8
self.lut_entries = 2**self.M
self.sine_lut_float = [
np.sin(i * 2 * np.pi / self.lut_entries)
for i in range(self.lut_entries)
]
self.sine_lut_fixed = [
FXnum(x, family=self.output_type) for x in self.sine_lut_float
]
self.square_lut_fixed = [FXnum(1, family=self.output_type) for x in range(int(self.lut_entries/2))] + \
[FXnum(-1, family=self.output_type) for x in range(int(self.lut_entries/2))]
self.triangle_lut_float = [
np.max(1 - np.abs(x)) for x in np.linspace(-1, 1, self.lut_entries)
]
self.triangle_lut_float = [x * 2 - 1 for x in self.triangle_lut_float
] # scale to range from -1 to 1
self.triangle_lut_fixed = [
FXnum(x, family=self.output_type) for x in self.triangle_lut_float
]
self.sawtooth_lut_float = [
x - np.floor(x)
for x in np.linspace(0, 1 - 1e-16, self.lut_entries)
]
self.sawtooth_lut_float = [x * 2 - 1 for x in self.sawtooth_lut_float
] # scaling again
self.sawtooth_lut_fixed = [
FXnum(x, family=self.output_type) for x in self.sawtooth_lut_float
]
def testAddition(self):
"""Addition operators should promote & commute"""
scale = 0.125
for x in range(-16, 16):
fpx = FXnum(x * scale)
for y in range(-32, 32):
fpy = FXnum(y * scale)
fpa = FXnum((x + y) * scale)
# compute various forms of a = (x + y):
self.assertEqual(fpa, fpx + fpy)
self.assertEqual(fpa, fpy + fpx)
self.assertEqual((x + y) * scale, float(fpx + fpy))
tmp = fpx
tmp += fpy
self.assertEqual(fpa, tmp)
tmp = float(x * scale) + fpy
self.assertEqual(fpa, tmp)
tmp = fpx + float(y * scale)
self.assertEqual(fpa, tmp)
def testSubtraction(self):
"""Subtraction operators should promote & anti-commute"""
scale = 0.0625
for x in range(-32, 16):
fpx = FXnum(x * scale)
for y in range(-16, 32):
fpy = FXnum(y * scale)
fpa = FXnum((x - y) * scale)
# compute various forms of a = (x - y):
self.assertEqual(fpa, fpx - fpy)
self.assertEqual(-fpa, fpy - fpx)
self.assertEqual((x - y) * scale, float(fpx - fpy))
tmp = fpx
tmp -= fpy
self.assertEqual(fpa, tmp)
tmp = float(x * scale) - fpy
self.assertEqual(fpa, tmp)
tmp = fpx - float(y * scale)
self.assertEqual(fpa, tmp)
def testBitShifts(self):
"""Check effects of left & right shift operators."""
fam = FXfamily(32)
self.assertEqual(FXnum(1, fam) << 2, 4)
self.assertEqual(FXnum(3, fam) << 4, 48)
self.assertEqual(FXnum(-7, fam) << 8, -7 * 256)
self.assertEqual(FXnum(1, fam) >> 1, 0.5)
self.assertEqual(FXnum(12, fam) >> 2, 3)
self.assertEqual(FXnum(-71 * 1024, fam) >> 12, -17.75)
def testSinCos(self):
"""sin/cos methods agree with math.sin/cos"""
fam62 = FXfamily(62)
scale = 0.342
fang = FXnum(0, fam62)
self.assertEqual(fang, fang.sin())
self.assertEqual(FXnum(1,fam62), fang.cos())
for i in range(-32, 32):
x = i * scale
sin_true = math.sin(x)
cos_true = math.cos(x)
fang = FXnum(x, fam62)
(sin, cos) = fang.sincos()
self.assertAlmostEqual(sin_true, sin)
self.assertAlmostEqual(cos_true, cos)
self.assertEqual(sin, fang.sin())
self.assertEqual(cos, fang.cos())
def testPowSpecials(self):
"""Check raising of special values to powers."""
fam30 = FXfamily(30)
for i in range(1, 30):
# Check x^0 == 1
self.assertEqual(FXnum(i * 0.2, fam30)**0, fam30.unity)
# Check 0^n == 0
self.assertEqual(fam30.zero**i, fam30.zero)
# Check 0^x == 0
self.assertEqual(fam30.zero**(i * 0.27), fam30.zero)
# Check 0^-x
with self.assertRaises(FXdomainError):
fam30.zero**(1 - i)
with self.assertRaises(FXdomainError):
fam30.zero**-(i * 0.23)
def testArcSinCos(self):
"""asin/acos methods should be inverses of sin/cos"""
fam62 = FXfamily(62)
trig = FXnum(0, fam62)
self.assertEqual(trig, trig.asin())
self.assertEqual(trig, FXnum(1, fam62).acos())
steps = 20
for i in range(0, steps + 1):
for s in [-1.0, 1.0]:
trig = FXnum((i * s) / steps, fam62)
isn = trig.asin()
self.assertTrue(abs(isn) <= fam62.pi / 2)
self.assertAlmostEqual(float(trig), float(isn.sin()))
self.assertAlmostEqual(float(isn), math.asin(float(trig)))
ics = trig.acos()
self.assertTrue(0 <= ics and ics <= fam62.pi)
self.assertAlmostEqual(float(trig), float(ics.cos()))
self.assertAlmostEqual(float(ics), math.acos(float(trig)))
