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Re: [Discuss-gnuradio] dial_tone.py add_ff()

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] dial_tone.py add_ff()
Date: Fri, 03 Dec 2010 21:15:22 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10

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were out of date or perhaps I missed something on the install.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:

The intention of the original example was to play the two tones on separate speakers (left and right). Might not work on
  all sound systems/configurations.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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