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#!/usr/bin/env python
#
# Copyright 2007 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., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr
from gnuradio.vocoder import cvsd_vocoder
class cvsd_encode(gr.hier_block):
def __init__(self, fg, resample=8):
scale_factor = 32000.0
self.interp = resample
src_scale = gr.multiply_const_ff(scale_factor)
interp = gr.interp_fir_filter_fff(self.interp, self.interp*(1,))
f2s = gr.float_to_short()
enc = cvsd_vocoder.encode_sb()
fg.connect(src_scale, interp, f2s, enc)
gr.hier_block.__init__(self, fg, src_scale, enc)
class cvsd_decode(gr.hier_block):
def __init__(self, fg, resample=8):
scale_factor = 32000.0
self.decim = resample
dec = cvsd_vocoder.decode_bs()
s2f = gr.short_to_float()
decim = gr.fir_filter_fff(self.decim, (1,))
sink_scale = gr.multiply_const_ff(1.0/scale_factor)
fg.connect(dec, s2f, decim, sink_scale)
gr.hier_block.__init__(self, fg, dec, sink_scale)
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