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

[Marcus D. Leech]

> 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 were out of date or perhaps I missed something on the install.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
http://www.sbrac.org