On Fri, Apr 4, 2008 at 8:28 AM, Darryl Ross <[EMAIL PROTECTED]> wrote:
> Hi Tim, > > Thanks for the reply. > > Tim Meehan wrote: > > > On Fri, Apr 4, 2008 at 12:51 AM, Darryl Ross <[EMAIL PROTECTED]> 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. By converting to complex in this way you are passing flex_demod "complex" data with the imaginary values set to 0. The first thing flex_demod does is a passes the data to quadrature_demod which basically does a FM detection. Take a look at flex_demod.py in the gr-pager tree. I think the data you are brining in on the sound card has already been "detected" by your radio (if I understand properly based on the link you provided). My suggestion: Take a good close look at flex_demod.py. There may be someone else on the list who can provide more help. > > > 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?) > I did not look too close at the link but these mods are typically to allow the radio to operate in a band they were designed to block. For example mobile phone bands. > > 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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