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Contents
module SPCore
# Produces a Blackman window of a given size (number of samples).
# For more info, see https://en.wikipedia.org/wiki/Window_function#Blackman_windows.
class BlackmanWindow
attr_reader :data
def initialize size
@data = Array.new size
alpha = 0.16
a0 = (1 - alpha) / 2.0
a1 = 0.5
a2 = alpha / 2.0
size.times do |n|
@data[n] = a0 - (a1 * Math::cos((TWO_PI * n)/(size - 1))) + (a2 * Math::cos((FOUR_PI * n)/(size - 1)))
end
end
end
end
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9 entries across 9 versions & 1 rubygems