def __init__(self, decim, taps, channel=0): gr.hier_block2.__init__(self, "pfb_decimator_ccf", gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature self._decim = decim self._taps = taps self._channel = channel self.s2ss = gr.stream_to_streams(gr.sizeof_gr_complex, self._decim) self.pfb = gr.pfb_decimator_ccf(self._decim, self._taps, self._channel) self.connect(self, self.s2ss) for i in xrange(self._decim): self.connect((self.s2ss,i), (self.pfb,i)) self.connect(self.pfb, self)
def __init__(self, decim, taps=None, channel=0, atten=100): gr.hier_block2.__init__( self, "pfb_decimator_ccf", gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature self._decim = decim self._channel = channel if taps is not None: self._taps = taps else: # Create a filter that covers the full bandwidth of the input signal bw = 0.4 tb = 0.2 ripple = 0.1 made = False while not made: try: self._taps = optfir.low_pass(1, self._decim, bw, bw + tb, ripple, atten) made = True except RuntimeError: ripple += 0.01 made = False print( "Warning: set ripple to %.4f dB. If this is a problem, adjust the attenuation or create your own filter taps." % (ripple)) # Build in an exit strategy; if we've come this far, it ain't working. if (ripple >= 1.0): raise RuntimeError( "optfir could not generate an appropriate filter.") self.s2ss = gr.stream_to_streams(gr.sizeof_gr_complex, self._decim) self.pfb = gr.pfb_decimator_ccf(self._decim, self._taps, self._channel) self.connect(self, self.s2ss) for i in xrange(self._decim): self.connect((self.s2ss, i), (self.pfb, i)) self.connect(self.pfb, self)
def __init__(self, decim, taps=None, channel=0, atten=100): gr.hier_block2.__init__(self, "pfb_decimator_ccf", gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature self._decim = decim self._channel = channel if taps is not None: self._taps = taps else: # Create a filter that covers the full bandwidth of the input signal bw = 0.4 tb = 0.2 ripple = 0.1 made = False while not made: try: self._taps = optfir.low_pass(1, self._decim, bw, bw+tb, ripple, atten) made = True except RuntimeError: ripple += 0.01 made = False print("Warning: set ripple to %.4f dB. If this is a problem, adjust the attenuation or create your own filter taps." % (ripple)) # Build in an exit strategy; if we've come this far, it ain't working. if(ripple >= 1.0): raise RuntimeError("optfir could not generate an appropriate filter.") self.s2ss = gr.stream_to_streams(gr.sizeof_gr_complex, self._decim) self.pfb = gr.pfb_decimator_ccf(self._decim, self._taps, self._channel) self.connect(self, self.s2ss) for i in xrange(self._decim): self.connect((self.s2ss,i), (self.pfb,i)) self.connect(self.pfb, self)