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| author | n4hy | 2008-10-01 02:22:52 +0000 |
|---|---|---|
| committer | n4hy | 2008-10-01 02:22:52 +0000 |
| commit | 3d7cc189f109b1c53623e85e1c74c903837919bf (patch) | |
| tree | 5642bc0472e34599026ac5912f7aa98a9a22ac0c /gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py | |
| parent | 54d49bfa380979795cc72fbfb72cefa9ec49d668 (diff) | |
| download | gnuradio-3d7cc189f109b1c53623e85e1c74c903837919bf.tar.gz gnuradio-3d7cc189f109b1c53623e85e1c74c903837919bf.tar.bz2 gnuradio-3d7cc189f109b1c53623e85e1c74c903837919bf.zip | |
Stereo receiver with 48 kHz sample rate output using rational resampler. Better filters chosen than optfir.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@9689 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 | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py b/gnuradio-examples/python/usrp/usrp_wfm_rcv_pll.py index 1301bf20a..80f2b8466 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 = 200 + usrp_decim = 160 self.u.set_decim_rate(usrp_decim) - usrp_rate = adc_rate / usrp_decim # 320 kS/s + usrp_rate = adc_rate / usrp_decim # 400 kS/s chanfilt_decim = 1 demod_rate = usrp_rate / chanfilt_decim audio_decimation = 10 - audio_rate = demod_rate / audio_decimation # 32 kHz + audio_rate = 6*demod_rate / audio_decimation/5 # 48 kHz if options.rx_subdev_spec is None: options.rx_subdev_spec = pick_subdevice(self.u) @@ -96,15 +96,17 @@ class wfm_rx_block (stdgui2.std_top_block): self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec) - chan_filt_coeffs = optfir.low_pass (1, # gain + chan_filt_coeffs = gr.firdes.low_pass_2 (1, # gain usrp_rate, # sampling rate - 80e3, # passband cutoff - 115e3, # stopband cutoff - 0.1, # passband ripple + 90e3, # passband cutoff + 30e3, # transition bandwidth 60) # stopband attenuation - #print len(chan_filt_coeffs) +# 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.guts = blks2.wfm_rcv (demod_rate, audio_decimation) self.guts = blks2.wfm_rcv_pll (demod_rate, audio_decimation) @@ -120,8 +122,9 @@ class wfm_rx_block (stdgui2.std_top_block): # now wire it all together self.connect (self.u, chan_filt, self.guts) - self.connect ((self.guts, 0), self.volume_control_l, (audio_sink, 0)) - self.connect ((self.guts, 1), self.volume_control_r, (audio_sink, 1)) + self.connect((self.guts, 0), self.lchan_sample,self.volume_control_l,(audio_sink,0)) + self.connect((self.guts, 1), self.rchan_sample,self.volume_control_r,(audio_sink,1)) + try: self.guts.stereo_carrier_pll_recovery.squelch_enable(True) except: |