Re: [Discuss-gnuradio] GRC:Suitable Sink required
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 --- On Mon, 4/20/09, Josh Blum j...@joshknows.com wrote: From: Josh Blum j...@joshknows.com Subject: Re: [Discuss-gnuradio] GRC:Suitable Sink required To: Saleem Akhtar saleemakhta...@yahoo.com Cc: discuss-gnuradio@gnu.org 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 -Inline Attachment Follows- ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GRC:Suitable Sink required
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 Saleem Akhtar wrote: 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 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GRC:Suitable Sink required
Hi, On Mon, 4/20/09, Saleem Akhtar saleemakhta...@yahoo.com wrote: Hi, It appears that gr.message_sink and gr..msg_queues are for digital data. but my flowgraph (periodogram) is for analog samples, This is not true (see: usrp_spectrum_sense.py). 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 You can use vector sink. ex: dst = gr.vector_sink_f() then you can see the data in this vector by: print dst.data() Of course you have to run the graph for a while then stop it before doing the print. See : http://www.mail-archive.com/discuss-gnuradio@gnu.org/msg13693.html BR Firas ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GRC:Suitable Sink required
Ahh, no vector sink. The vector sink will queue up samples forever, and although you can clear the buffer, you will not stay vector aligned with the fft size. Vector sink is good for the QA code with a finite number of samples in and out, but i would definitely not recommend it for dealing with live data. You can use vector sink. ex: dst = gr.vector_sink_f() then you can see the data in this vector by: print dst.data() ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GRC:Suitable Sink required
You should probably start by looking at the existing wx gui sinks, copy and modify one: http://gnuradio.org/trac/browser/gnuradio/trunk/gr-wxgui/src/python The vector sink is not what you want here. -Josh Saleem Akhtar wrote: Hi, I am trying to implement a periodogram in gnu radio. http://img25.imageshack.us/img25/1606/powerdetectorgrc.png Currently, I am stuck in deciding what sink i should use and how. I want the output in the the form of an array so that I can have calculations on the periodogram samples. As the input are the realtime complex baseband samples from the USRP (here shown with a signal source), thus the sink should be flexible enough to be updated. Thus I think that a fixed length float vector sink doesnt suits here. I dont know how to proceed from here :-) Regards, Ali ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GRC:Suitable Sink required
Thanks, but i dont want to use GUI sink. I want to get an array of samples which represent the periodogram. So that i can do further processing on them. Regards From: Josh Blum j...@joshknows.com Subject: Re: [Discuss-gnuradio] GRC:Suitable Sink required To: Saleem Akhtar saleemakhta...@yahoo.com Cc: discuss-gnuradio@gnu.org Date: Monday, April 20, 2009, 3:55 AM You should probably start by looking at the existing wx gui sinks, copy and modify one: http://gnuradio.org/trac/browser/gnuradio/trunk/gr-wxgui/src/python The vector sink is not what you want here. -Josh ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GRC:Suitable Sink required
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 Saleem Akhtar wrote: Thanks, but i dont want to use GUI sink. I want to get an array of samples which represent the periodogram. So that i can do further processing on them. Regards From: Josh Blum j...@joshknows.com Subject: Re: [Discuss-gnuradio] GRC:Suitable Sink required To: Saleem Akhtar saleemakhta...@yahoo.com Cc: discuss-gnuradio@gnu.org Date: Monday, April 20, 2009, 3:55 AM You should probably start by looking at the existing wx gui sinks, copy and modify one: http://gnuradio.org/trac/browser/gnuradio/trunk/gr-wxgui/src/python The vector sink is not what you want here. -Josh ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GRC:Suitable Sink required
Thanks! I will look into it. --- On Mon, 4/20/09, Josh Blum j...@joshknows.com wrote: From: Josh Blum j...@joshknows.com Subject: Re: [Discuss-gnuradio] GRC:Suitable Sink required To: Saleem Akhtar saleemakhta...@yahoo.com Cc: discuss-gnuradio@gnu.org 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 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
