Re: GRC:Suitable Sink required


#1

Hi,
It appears that gr.message_sink and gr.msg_queues are for digital data.
but my flowgraph (periodogram) is for analog samples,

complex baseband samples from usrp --> stream to vector (vectors of
fft_size) --> FFT
 --> complex to mag squared --> (sink or block to be determined)

Is their no choice other than file sink?

Thanks

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— On Mon, 4/20/09, Josh B. removed_email_address@domain.invalid wrote:

From: Josh B. removed_email_address@domain.invalid
Subject: Re: [Discuss-gnuradio] GRC:Suitable Sink required
To: “Saleem A.” removed_email_address@domain.invalid
Cc: removed_email_address@domain.invalid
Date: Monday, April 20, 2009, 4:37 AM

You can use a file sink to write the samples out to a file, and write
some program to process the file.

Or, you need to create your own block in c++ or python. If c++, the “how
to write a block example” is a good reference. If python, the wxgui
sinks are a good reference (see gr.message_sink and gr.msg_queues to get
data out of the stream and into
python).

-Josh

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#2

If you want to extract samples from a gnuradio data stream and process
them in python, you should make a hierarchical block with a message sink
inside. The wxgui blocks are all great examples for this.

Try
http://gnuradio.org/trac/browser/gnuradio/trunk/gr-wxgui/src/python/fftsink_gl.py

-Josh