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From: | Alexander List |
Subject: | Re: [Discuss-gnuradio] Clear my fundamentals |
Date: | Mon, 02 Nov 2009 19:21:00 +0100 |
User-agent: | Thunderbird 2.0.0.21 (X11/20090320) |
address@hidden wrote:
Message: 2 Date: Sun, 01 Nov 2009 10:17:59 -0800 From: Josh Blum <address@hidden> Subject: Re: [Discuss-gnuradio] Clear my fundamentals :) To: Blue Boy <address@hidden> Cc: address@hidden Message-ID: <address@hidden> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Blue Boy wrote:Hello Everyone, My first post: I am a windows kernel programmer by profession.Recently my interest has grown for SDR gnuradio.I an new to this field so I have newbie doubts.I would welcome if you just point to some links for my answers. 1] What is usrp cfile format? complex/float but whats stored in numbers like amplitude/intensity/phase difference etc.Its a binary file containing 64-bit complex numbers where each 64 bit complex number is 2 32-bit floating point numbers corresponding to to the real and imaginary parts of a complex number.2] Is frequency also stored in the cfile ? or we have to assume frequency from file name? How to reconstruct complete/sampled signal from Cfile ?You need to know the sampling rate and baseband frequency, the file is just raw data samples without any context. Hi Josh, I have a related question: Is there anything like an (upcoming) industry standard for recorded SDR samples, *including* the metadata? I guess that would make it a lot easier to exchange recordings between different platforms, and would also save people from the hassle of encoding metadata in the filename or an external data source. I guess NetCDF would be one possible way - it's widely used e.g. in the geosciences: http://www.unidata.ucar.edu/software/netcdf/usage.html http://www.unidata.ucar.edu/software/netcdf/docs/faq.html#whatisit Of course we would have to define the schema for SDR data... Alex |
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