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Re: [Discuss-gnuradio] Log raw data from the usrp_spectrum_sense.py

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Log raw data from the usrp_spectrum_sense.py
Date: Mon, 01 Dec 2014 16:30:25 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0

Hi Leo,

usrp_spectrum_sense actually has nothing to do with the FPGA -- in fact,
it just gets complex samples from a USRP, and displays them in frequency
domain; so hopefully that answers your question :)

Regarding writing the raw binary data to a file: These are binary
samples, and not text, and thus you won't see anything useful in a text

Best regards,

On 12/01/2014 03:49 PM, Leo Yang wrote:
> I'm using the usrp_spectrum_sense.py to get the raw data for the wide band
> spectrum for FFT in the FPGA . The thing confused me is what the raw data
> is. Is that the complex signal before fft ? 
> As  m.raw_data is a string that contains the binary floats, when i try to
> log it in a txt file, it outputs Garbled text, and it seems only take few
> millisecond, and how to control the time to do the spectrum sensing btw.
> here is the code for exporting the m.raw_data        
>         text_file = open("Output.txt", "w")
>         text_file.write("binary floats: %s" % m.raw_data)
>         text_file.close()
> Thanks a lot 
> --
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