47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
#!/usr/bin/env python3
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import math
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# Adapt these constants to your window requirements
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NUMBER_OF_COEFFICIENTS = 128
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BITS_PER_COEFFICIENT = 16
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# If set to true, the coefficients will be scaled to include the window amplitude correction factor.
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# They will also be scaled to 1/8 to have enough headroom for the correction.
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INCLUDE_AMPLITUDE_CORRECTION = True
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# Don't change anything below this line
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class Window:
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def __init__(self, name, function, correction):
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self.name = name
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self.function = function
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self.correction = correction
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def StartFile(self):
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self.file = open(self.name+".txt", "w")
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def AddCoefficient(self, normalized_index):
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if not hasattr(self, 'file'):
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self.StartFile()
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value = self.function(normalized_index)
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if INCLUDE_AMPLITUDE_CORRECTION:
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value = value * self.correction / 8.0
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value = int(value * (2 ** (BITS_PER_COEFFICIENT-1)))
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# prevent overflow
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if value >= (2 ** (BITS_PER_COEFFICIENT-1)):
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value = value - 1
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output = "{0:b}".format(value)
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self.file.write(output.zfill(BITS_PER_COEFFICIENT)+"\n")
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def calc_hann(i):
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return math.sin(math.pi * i) ** 2
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WindowList = []
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WindowList.append(Window("Hann", calc_hann, 2.0))
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for i in range(NUMBER_OF_COEFFICIENTS):
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norm_i = (i+0.5) / NUMBER_OF_COEFFICIENTS
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for w in WindowList:
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w.AddCoefficient(norm_i)
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