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| author | n4hy | 2008-10-01 20:42:43 +0000 |
|---|---|---|
| committer | n4hy | 2008-10-01 20:42:43 +0000 |
| commit | 5bfda44b8d4093c81779c05c98f3bbd310f198df (patch) | |
| tree | 0f32d55fa026e9d26aad1210afa5117f5237d141 /gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py | |
| parent | d9b0663b0170c7f5958df900ce68f15ea2b0434f (diff) | |
| download | gnuradio-5bfda44b8d4093c81779c05c98f3bbd310f198df.tar.gz gnuradio-5bfda44b8d4093c81779c05c98f3bbd310f198df.tar.bz2 gnuradio-5bfda44b8d4093c81779c05c98f3bbd310f198df.zip | |
pll bandwidth optimized to more nearly meet Carson's rule. The 19 kHz pilot recovery will soon be replace by polyphase channelizer trick
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@9694 221aa14e-8319-0410-a670-987f0aec2ac5
Diffstat (limited to 'gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py')
| -rwxr-xr-x | gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py b/gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py index 80f2b8466..84992955a 100755 --- a/gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py +++ b/gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py @@ -81,13 +81,13 @@ class wfm_rx_block (stdgui2.std_top_block): self.u = usrp.source_c() # usrp is data source adc_rate = self.u.adc_rate() # 64 MS/s - usrp_decim = 160 + usrp_decim = 200 self.u.set_decim_rate(usrp_decim) - usrp_rate = adc_rate / usrp_decim # 400 kS/s + usrp_rate = adc_rate / usrp_decim # 320 kS/s chanfilt_decim = 1 demod_rate = usrp_rate / chanfilt_decim audio_decimation = 10 - audio_rate = 6*demod_rate / audio_decimation/5 # 48 kHz + audio_rate = 3*demod_rate / audio_decimation/2 # 48 kHz if options.rx_subdev_spec is None: options.rx_subdev_spec = pick_subdevice(self.u) @@ -100,12 +100,13 @@ class wfm_rx_block (stdgui2.std_top_block): usrp_rate, # sampling rate 90e3, # passband cutoff 30e3, # transition bandwidth - 60) # stopband attenuation -# print len(chan_filt_coeffs) + 70, # stopband attenuation + gr.firdes.WIN_BLACKMAN) + print len(chan_filt_coeffs) chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs) - self.rchan_sample = blks2.rational_resampler_fff(6,5) - self.lchan_sample = blks2.rational_resampler_fff(6,5) + self.rchan_sample = blks2.rational_resampler_fff(3,2) + self.lchan_sample = blks2.rational_resampler_fff(3,2) #self.guts = blks2.wfm_rcv (demod_rate, audio_decimation) |