Re: [Discuss-gnuradio] Read FM signal

[Ivo Carlson]

I think I wasn't clear enough. When I say the format I mean the Physical Equivalency of the output (e.g. The number x represents the point in a Time x Frequency graph).

For now, I'm using the attached flowgraph to read a radio signal.

I need a way open the wave or the spectrogram so I can apply a Statistical method.

As I already have the .wav so use Octave is a possibility, but I wish to know if that's the better way.

Looks to me that use the File Sink will provide better info than the WAV, but how can I use it for it? Should I generate the file with the File Sink in a specific extension? Where can I open it and what is the physical meaning of that information?

I'm using this flowgraph to read an FM signal but I wish to expand to other kinds of electromagnetic waves in the future, is that the better way of doing this?

I'm already opened to suggestions on the flowgraph and reading signal process.

Best Regards

On Thu, Apr 19, 2018 at 5:08 PM, Müller, Marcus (CEL) <address@hidden> wrote:

Nope! That's a common misconception!
The file sink just writes the bits as they come in. Whether, for
example, a 64 bit item is actually a complex number consisting of two
32 bit IEEE754 floats, or a double, or two 32 bit integers, or one
64bit integers, or just a vector of 8 Bytes of data (chars) is really
of no difference to the sink.

On Thu, 2018-04-19 at 20:04 +0000, Patrick Sathyanathan wrote:
> Hi Ivo,
>
> The binary format depends on what you have set as the "Input Type" in the file sink. The default is "Complex" in which case the values are 32-bit float I followed by 32-bit float Q. The order of the 4-bytes in the float likely depends on the endianness of your host system.
>
> --Patrick

> From: Discuss-gnuradio <discuss-gnuradio-bounces+wpats=address@hidden> on behalf of rear1019 <address@hidden>
> Sent: Wednesday, April 18, 2018 9:58 PM
> To: address@hidden
> Subject: Re: [Discuss-gnuradio] Read FM signal
> 
> On Tue, 17 Apr 2018 at 14:32:17 -0300, Ivo Carlson wrote:
> > […]
> > The file sink saves the data in a binary format, but I don't know what
> > this data represents. How do I interpret this data? What does this data
> > represent?
>
> This question can not be answered as we don’t know how your flowgraph
> looks like. Provide your flowgraph (.grc file) or a screenshot (open the
> flowgraph in GNU Radio Companion, go to File menu and select “Screen
> Capture”).
>
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RadioReceiver.grc
Description: application/gnuradio-grc