Imported Upstream version 3.2.2

[debian/gnuradio] / gnuradio-core / src / python / gnuradio / blksimpl / nbfm_rx.py

diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/nbfm_rx.py b/gnuradio-core/src/python/gnuradio/blksimpl/nbfm_rx.py
deleted file mode 100644 (file)
index 6ec0635..0000000
--- a/gnuradio-core/src/python/gnuradio/blksimpl/nbfm_rx.py
+++ /dev/null
@@ -1,87 +0,0 @@
-#
-# Copyright 2005 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 3, 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.
-# 
-
-import math
-from gnuradio import gr, optfir
-from gnuradio.blksimpl.fm_emph import fm_deemph
-from gnuradio.blksimpl.standard_squelch import standard_squelch
-
-class nbfm_rx(gr.hier_block):
-    def __init__(self, fg, audio_rate, quad_rate, tau=75e-6, max_dev=5e3):
-        """
-        Narrow Band FM Receiver.
-
-        Takes a single complex baseband input stream and produces a single
-        float output stream of audio sample in the range [-1, +1].
-
-        @param fg: flow graph
-        @param audio_rate: sample rate of audio stream, >= 16k
-        @type audio_rate: integer
-        @param quad_rate: sample rate of output stream
-        @type quad_rate: integer
-        @param tau: preemphasis time constant (default 75e-6)
-        @type tau: float
-        @param max_dev: maximum deviation in Hz (default 5e3)
-        @type max_dev: float
-
-        quad_rate must be an integer multiple of audio_rate.
-
-        Exported sub-blocks (attributes):
-          squelch
-          quad_demod
-          deemph
-          audio_filter
-        """
-
-        # FIXME audio_rate and quad_rate ought to be exact rationals
-        audio_rate = int(audio_rate)
-        quad_rate = int(quad_rate)
-
-        if quad_rate % audio_rate != 0:
-            raise ValueError, "quad_rate is not an integer multiple of audio_rate"
-
-        squelch_threshold = 20         # dB
-        #self.squelch = gr.simple_squelch_cc(squelch_threshold, 0.001)
-
-        # FM Demodulator  input: complex; output: float
-        k = quad_rate/(2*math.pi*max_dev)
-        self.quad_demod = gr.quadrature_demod_cf(k)
-
-        # FM Deemphasis IIR filter
-        self.deemph = fm_deemph (fg, quad_rate, tau=tau)
-
-        # compute FIR taps for audio filter
-        audio_decim = quad_rate // audio_rate
-        audio_taps = gr.firdes.low_pass (1.0,            # gain
-                                         quad_rate,      # sampling rate
-                                         4.5e3,          # Audio LPF cutoff
-                                         2.5e3,          # Transition band
-                                         gr.firdes.WIN_HAMMING)  # filter type
-
-        print "len(audio_taps) =", len(audio_taps)
-
-        # Decimating audio filter
-        # input: float; output: float; taps: float
-        self.audio_filter = gr.fir_filter_fff(audio_decim, audio_taps)
-
-        fg.connect(self.quad_demod, self.deemph, self.audio_filter)
-
-        gr.hier_block.__init__(self, fg, self.quad_demod, self.audio_filter)