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

[Tommy James Tracy II]

On 10/6/12 5:37 PM, Patrik Tast wrote:
> Hi Tommy,
> 
> Most likely the file (wav) you have found is in 8bit.
> Try to adjust your source file sink.
> 
> Patrik
> 
Dear Patrik,

        What do you mean by source file sink?
I used soundconverter to convert the WAV file to mp3, and then back to a
32-bit sampled WAV. I tried it, and it failed with the same error.

I also tried to use FFT with byte input, but that doesn't exist. The
only options are float or complex.

Again thank you!

Tom

> 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!
>> _______________________________________________
>> Discuss-gnuradio mailing list
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>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
> 
> 
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-- 
  Tommy J. Tracy II
 Computer Engineering
University of Virginia

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