Re: [Discuss-gnuradio] Help Needed: ValueError: itemsize mismatch: audio_alsa_source(1):0 using 4, flex_demod(2):0 using 8

[Darryl Ross]

Hi Tim,

Thanks for the reply.

Tim Meehan wrote:
> On Fri, Apr 4, 2008 at 12:51 AM, Darryl Ross <address@hidden> wrote:
>     I'm guessing that I need to process (resample?) the signal from the
>     sound card before passing it to the flex decoder, but I'm not sure what
>     that processing would be. I'm very new to signal processing, so don't
>     know what search terms I should be using.
>
> I think flex_demod is looking for  complex data  at baseband

I'm not sure how to do this. I have updated my program so that it looks 
like what's below, but I do not get anything printed.

I have tried both hw:0 and plughw:0.

I have a Uniden Bearcat 92XLT modified to add a discriminator tap, from 
the instructions at http://www.discriminator.nl/ubc72xlt/index-en.html. 
(One question I have is what is the purpose of the 10K resistor?)

Thanks
-Darryl

> #!/usr/bin/python
>
> import time
> from gnuradio import audio, gr, pager
>
>
> audio_device = 'hw:0'
> sample_rate = 48000
>
>
> class top_block(gr.top_block):
>     def __init__(self, queue):
>         gr.top_block.__init__(self)
>
>         src = audio.source(sample_rate, audio_device)
>         dst = pager.flex_demod(queue)
>
>         converter = gr.float_to_complex()
>
>         self.connect(src, converter)
>         self.connect(converter, dst)
>
>
> if __name__ == '__main__':
>     queue = gr.msg_queue()
>     tb = top_block(queue)
>     tb.start()
>     while True:
>         if not queue.empty_p():
>             msg = queue.delete_head()
>             print msg.to_string()
>         time.sleep(0.5)

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