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Contents
module SPCore
# Produces a Blackman-Nuttall window of a given size (number of samples).
# For more info, see https://en.wikipedia.org/wiki/Window_function#Blackman.E2.80.93Nuttall_window.
class BlackmanNuttallWindow
attr_reader :data
def initialize size
@data = Array.new(size)
a0, a1, a2, a3 = 0.3635819, 0.4891775, 0.1365995, 0.0106411
size.times do |n|
@data[n] = a0 - a1 * Math::cos((TWO_PI * n)/(size - 1)) + a2 * Math::cos((FOUR_PI * n)/(size - 1)) - a3 * Math::cos((SIX_PI * n)/(size - 1))
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems