From fb9381ed2a2102eb7b0cf3ffa41d41cbefda7299 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ji=C5=99=C3=AD=20Pinkava?= <j-pi@seznam.cz>
Date: Fri, 3 Oct 2014 03:34:15 +0200
Subject: [PATCH] add demodulator for multiple channels

---
 src/demod/python/osmosdr-tetra-multidemod.py | 96 ++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100755 src/demod/python/osmosdr-tetra-multidemod.py

diff --git a/src/demod/python/osmosdr-tetra-multidemod.py b/src/demod/python/osmosdr-tetra-multidemod.py
new file mode 100755
index 0000000..22bfd1b
--- /dev/null
+++ b/src/demod/python/osmosdr-tetra-multidemod.py
@@ -0,0 +1,96 @@
+#!/usr/bin/env python2
+
+from gnuradio import blocks
+from gnuradio import eng_notation
+from gnuradio import filter
+from gnuradio import gr
+from gnuradio.eng_option import eng_option
+from gnuradio.filter import firdes
+from gnuradio.filter import pfb
+import osmosdr
+import tetra_demod
+
+class top_block(gr.top_block):
+
+    def __init__(self):
+        gr.top_block.__init__(self)
+
+        ##################################################
+        # Variables
+        ##################################################
+        self.symbol_rate = symbol_rate = 18000
+        self.samp_per_sym = samp_per_sym = 2
+        self.channel_width = channel_width = 25e3
+        self.chans = chans = 36*2  # must be multiple of 36
+        self.sample_rate = sample_rate = chans * channel_width
+        self.out_samp_rate = out_samp_rate = symbol_rate*samp_per_sym
+        self.offset = offset = -73e3
+        self.lowpass = lowpass = 17.5e3
+        self.fnames = '/home/test/tetra-tmp/fifo'
+
+        #### LIST OF DEMODULATED CHANNELS
+        # numbered from leftmost to rightmost
+        self.selected = [ 6,7,8,9,12,13,14,16,17,19,20,21,23,24,26,31,32,33,34,35,38,42,43,44,45,46,47,50,52,53,55,56,61,62,69,70]
+
+        ##################################################
+        # Blocks
+        ##################################################
+
+        # Common for all targets
+        #self.source = osmosdr.source( args="rtl_tcp=radio-tetra.brm:1234")
+        self.source = osmosdr.source()
+        self.source.set_sample_rate(sample_rate)
+        self.source.set_center_freq(424.065e6, 0)
+        self.source.set_freq_corr(0, 0)
+        self.source.set_dc_offset_mode(0, 0)
+        self.source.set_iq_balance_mode(0, 0)
+        self.source.set_gain_mode(0, 0)
+        self.source.set_gain(31, 0)
+        self.source.set_if_gain(20, 0)
+        self.source.set_bb_gain(20, 0)
+        self.source.set_antenna("", 0)
+        self.source.set_bandwidth(0, 0)
+
+        self.channelizer = pfb.channelizer_ccf(
+              chans,
+              (),
+              1.0,
+              100)
+
+        self.channelizer.set_channel_map((range(chans/2, chans)+range(0,chans/2)))
+
+        # Generate per-target blocks
+        self.sinks = list()
+        self.demods = list()
+        self.resamplers = list()
+        sel = 1
+        for i in range(chans):
+            if i in self.selected:
+                self.resamplers.append(filter.rational_resampler_ccc(
+                    interpolation=36,
+                    decimation=25,
+                    taps=None,
+                    fractional_bw=None,
+                ))
+
+                self.demods.append(tetra_demod.demod())
+                self.sinks.append(blocks.file_sink(gr.sizeof_float, "%s/floats%d" % (self.fnames, sel)))
+                self.connect((self.channelizer, i), (self.resamplers[i], 0))
+                self.connect((self.resamplers[i], 0),  (self.demods[i], 0),  (self.sinks[i], 0))
+                sel = sel + 1
+                print "Enabled channel %d" % i
+            else:
+                self.resamplers.append(None)
+                self.demods.append(None)
+                self.sinks.append(blocks.null_sink(gr.sizeof_gr_complex*1))
+                self.connect((self.channelizer, i), (self.sinks[i], 0))
+                print "Skipping channel %d" % i
+
+        # Connections
+        self.connect((self.source, 0), (self.channelizer, 0))
+
+
+if __name__ == '__main__':
+    tb = top_block()
+    tb.run()
+