refactor fm_radio.py: rename variables of blocks

fm_radio.py

@@ -29,26 +29,25 @@ class fm_radio(gr.top_block):
         channel_width_hertz = 250000
         audio_sample_rate_hertz = 48000
 
-        self.rtlsdr_source_0 = osmosdr.source()
-        self.rtlsdr_source_0.set_sample_rate(samp_rate)
-        self.rtlsdr_source_0.set_center_freq((98.3 * 1e6), 0)
-        self.rational_resampler_xxx_0 = filter.rational_resampler_fff(
+        rtlsdr_source = osmosdr.source()
+        rtlsdr_source.set_sample_rate(samp_rate)
+        rtlsdr_source.set_center_freq((98.3 * 1e6), 0)
+        resampler = filter.rational_resampler_fff(
             interpolation=audio_sample_rate_hertz, decimation=channel_width_hertz
         )
-        self.low_pass_filter_0 = filter.fir_filter_ccf(
+        low_pass_filter = filter.fir_filter_ccf(
             (int(samp_rate / channel_width_hertz)),
             firdes.low_pass(2, samp_rate, 100000, 10000, window.WIN_KAISER, 6.76),
         )
-        self.audio_sink_0 = audio.sink(audio_sample_rate_hertz, "", True)
-        self.analog_wfm_rcv_0 = analog.wfm_rcv(
-            quad_rate=channel_width_hertz,
-            audio_decimation=1,
+        audio_sink = audio.sink(audio_sample_rate_hertz, "", True)
+        wbfm_demodulator = analog.wfm_rcv(
+            quad_rate=channel_width_hertz, audio_decimation=1
         )
 
-        self.connect((self.analog_wfm_rcv_0, 0), (self.rational_resampler_xxx_0, 0))
-        self.connect((self.low_pass_filter_0, 0), (self.analog_wfm_rcv_0, 0))
-        self.connect((self.rational_resampler_xxx_0, 0), (self.audio_sink_0, 0))
-        self.connect((self.rtlsdr_source_0, 0), (self.low_pass_filter_0, 0))
+        self.connect((wbfm_demodulator, 0), (resampler, 0))
+        self.connect((low_pass_filter, 0), (wbfm_demodulator, 0))
+        self.connect((resampler, 0), (audio_sink, 0))
+        self.connect((rtlsdr_source, 0), (low_pass_filter, 0))
 
 
 def main(top_block_cls=fm_radio, options=None):