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Clone from http://pc-instru.lpp.polytechnique.fr:5000/LFR_EMULATOR

p.367 "Digital Signal Processing with FPGA"

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      # compute the two scaled butterfly equations

      class ButterflyProcessor(object):

      	"""docstring for ClassName"""

      	def __init__(self, arg):

      		super(ButterflyProcessor, self).__init__()

      		self.arg = arg

      	def butterfly(self):

      		Dre = ( Are + Bre ) / 2

      		Dim = ( Aim + Bim ) / 2

      		Ere = ( Are - Bre ) / 2

      		Eim = ( Aim - Bim ) / 2

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				# compute the two scaled butterfly equations

				class ButterflyProcessor(object):
				"""docstring for ClassName"""
				def __init__(self, arg):
				super(ButterflyProcessor, self).__init__()
				self.arg = arg

				def butterfly(self):
				Dre = ( Are + Bre ) / 2
				Dim = ( Aim + Bim ) / 2
				Ere = ( Are - Bre ) / 2
				Eim = ( Aim - Bim ) / 2