Re: [Discuss-gnuradio] Having issues getting APT-DECODER Sample working

[Patrik Tast]

Hi Tommy,

Most likely the file (wav) you have found is in 8bit.
Try to adjust your source file sink.

Patrik

On Sat, 2012-10-06 at 16:51 -0400, Tommy James Tracy II wrote:
> Dear Gnuradio,
> 
>       I'm trying to run the following gnuradio program:
> http://www.oz9aec.net/index.php/gnu-radio/gnu-radio-blog/440-simple-apt-decoder-prototype
> 
> I found a WAV file online to use as the input to the APT-Decoder, so I
> fed it in. Unfortunately, the output file resulted in a bunch of '^@'
> characters instead of the expected ASCII(0) through ASCII(255).
> 
> To make sure that the Audio file source was actually producing an
> output, I hooked up an AUDIO_SINK block between the File Source and the
> Band Pass Filter. I heard the expected APT sound.
> 
> I then proceeded to drop in a WX GUI FFT Sink, and kept getting the
> following error:
> 
> Has anyone seen this?
> -----
> 
> Traceback (most recent call last):
>   File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/plotter_base.py",
> line 187, in _on_paint
>     for fcn in self._draw_fcns: fcn[1]()
>   File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/plotter_base.py",
> line 59, in draw
>     self._draw()
>   File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/grid_plotter_base.py",
> line 407, in _draw_point_label
>     label_str = self._populate_point_label(x_val, y_val)
>   File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/channel_plotter.py",
> line 151, in _populate_point_label
>     label_str += '\n%s: %s'%(channel, common.eng_format(y_value,
> self.y_units))
>   File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/common.py",
> line 82, in eng_format
>     coeff, exp, prefix = get_si_components(num)
>   File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/common.py",
> line 48, in get_si_components
>     exp = get_exp(num)
>   File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/common.py",
> line 37, in get_exp
>     return int(math.floor(math.log10(abs(num))))
> ValueError: cannot convert float NaN to integer
> 
> -----
> 
> I think this means that the WAV file (float output) is producing NAN
> outputs. Is there any way that I can remove those? Anyone have any
> success doing this before?
> 
> Thanks in advance!
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