#!/usr/bin/env python
#
# Copyright 2004 Free Software Foundation, Inc.
# 
# This file is part of GNU Radio
# 
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
# 
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING.  If not, write to
# the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
# 

from gnuradio import gr

def build_graph ():

	sampling_freq = 8e6

	fg = gr.flow_graph ()

	src = gr.sig_source_f (
		sampling_freq,
		gr.GR_SIN_WAVE, .455e6,
		1.5, -2.38)


	diff = gr.fir_filter_fff ( 1, [1, -1] )
	int = gr.iir_filter_ffd ( [1, 0], [0, 1] )

	dst_i = gr.file_sink (gr.sizeof_float, "restore_in")
	dst_o = gr.file_sink (gr.sizeof_float, "restore_out")

	fg.connect (src, dst_i)
	fg.connect (src, diff)
	fg.connect (diff, int )
	fg.connect (int, dst_o)

	return fg

def main ():
	fg = build_graph()
	fg.start()
	raw_input ('Press Enter to quit')
	fg.stop()

if __name__ == '__main__':
	main ()