[Discuss-gnuradio] Rearranging a running flow graph

[Patrick Strasser]

Hello!

I'd like to construct a demo for grc which can switch between two or 
more branches in a flow graph, like AM or FM: given a Signal, this would 
be modulated by an FM and an AM branch, then one is selected for a 
simulated channel (noise) and afterwards the signal is fed to either a 
FM or a AM demodulator. I want easily switch between the two behaviours, 
but am not shure about how to do this the Right Way.

I'd do this now with multiplicators, but that introduces for every 
branch a new block, and keeps the unused paths running, which is 
rousource hungry (I don't have that much CPU power).

An other way would be to do disconnects and connects in the flow graph. 
Is this a sensible way to go? Can I rearrange a running flow graph or do 
I have to stop before rearranging and start the flow graph afterwards?
Josh: What do you think about integrating this into grc?

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.

Patrick
--
Engineers motto: cheap, good, fast: choose any two
Patrick Strasser <patrick dot strasser at  tugraz dot at>
Student of Telematik, Techn. University Graz, Austria