[Discuss-gnuradio] callbacks for the channel model

[Josh Blum]

The blks.channel_model block would be more useful to GRC if it had some 
callbacks (functions to set the input parameters at runtime). So, for 
example, one could vary the noise voltage while the flow graph is running.

I attached a diff with 3 callbacks added. Hopefully, it will make its 
way into blks2.

-Josh

diff -Naur 
gnuradio_old/trunk/gnuradio-core/src/python/gnuradio/blksimpl/channel_model.py 
gnuradio_new/trunk/gnuradio-core/src/python/gnuradio/blksimpl/channel_model.py
--- 
gnuradio_old/trunk/gnuradio-core/src/python/gnuradio/blksimpl/channel_model.py  
    2007-08-30 01:17:33.000000000 -0400
+++ 
gnuradio_new/trunk/gnuradio-core/src/python/gnuradio/blksimpl/channel_model.py  
    2007-08-30 01:23:34.000000000 -0400
@@ -48,3 +48,12 @@
         fg.connect(self.noise, (self.noise_adder,0))
         
         gr.hier_block.__init__(self, fg, self.timing_offset, self.noise_adder)
+        
+    def set_noise_voltage(noise_voltage):
+        self.noise.set_amplitude(noise_voltage)
+        
+    def set_frequency_offset(frequency_offset):
+        self.freq_offset.set_frequency(frequency_offset)
+     
+    def set_taps(taps):
+        self.multipath.set_taps(taps)