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Re: [Discuss-gnuradio] Rearranging a running flow graph

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] Rearranging a running flow graph
Date: Sat, 17 Mar 2007 13:14:56 -0700
User-agent: Mutt/1.5.9i

On Sat, Mar 17, 2007 at 11:05:38AM -0400, Josh Blum wrote:
> Patrick Strasser wrote:
> >Hello!
> >
> I did not know that one can disconnect blocks in a running flow graph. 
> This is possible? Anyway, I will save that idea for the future.

It's currently flaky, and doesn't work well.

> >The third possibility would be contruct a swtich block that takes n 
> >inputs and has a method to select the input by a number. Would this be 
> >possible an a way so that the not-to be consumed path temporarily 
> >discontinues processing? On continuation, the interrupted path would 
> >work with old data. Any way to flush this or are the buffers small 
> >enough to neglect this effect? I guess this would also be true for 
> >connect/disconnect.
> I think gnuradio needs a mux and a demux block. A mux has N inputs and a 
> set_n method. The mux will only feed the output with the nth input 
> stream (throw out/ignore the other inputs). A demux has N outputs and a 
> set_n method. The demux will only feed the nth output with the input stream.
> The mux seems easy to make. Is the demux possible in the current 
> gnuradio? Meaning: can you feed one output and starve the other outputs?

With the new gr_hier_block2, it will be possible to construct one.

> In Patrick's example, the demux outputs would be an FM and an AM 
> demodulator.



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