Another GNU Radio noob here. I've been playing around with some of the
examples while I eagerly await my USRP1 and I had a question about the
dial_tone.py example.
I ran the dial_tone.py example that's part of the 3.3.0 release and noticed it
doesn't really sound like a (US) dial tone. I'm not sure if I understand the
code correctly but it doesn't seem like the signals actually get added
together. For example, changing src0 to 440 and src1 to 350 produces a
different sound.
I did some more searching on the Internet and found some other examples using
gr.add_ff(), so I added this to the dial_tone.py and it seemed to do the
trick. Did I miss something in the original example? I thought maybe my
libraries were out of date or perhaps I missed something on the install. I
double checked the repository at gnuradio.org and my copy is the same. I'm
running Ubuntu 10.10 on lenovo laptop with gnuradio 3.3.0.
Original source:
--- dial_tone.py ---
48 dst = audio.sink (sample_rate, options.audio_output)
49 self.connect (src0, (dst, 0))
50 self.connect (src1, (dst, 1))
Changes:
-------------
adder = gr.add_ff()
sink = audio.sink (sample_rate, options.audio_output)
self.connect (src0, (adder, 0))
self.connect (src1, (adder, 1))
self.connect(adder, sink)
Cheers,
-Tim
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