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## Re: [Discuss-gnuradio] Activating/Deactivating Blocks in real time

 From: Achilleas Anastasopoulos Subject: Re: [Discuss-gnuradio] Activating/Deactivating Blocks in real time Date: Thu, 3 Oct 2013 00:06:41 -0400

I guess I forgot to make this one thing more clear:

I would like the input stream of block A to be consumed even
when s(t)=1.

With Tim's suggestion, when s(t)=1 we will have the right output, but the input will be waiting in block's A queue to be processed the
moment s(t) turns 0.
Is this correct, or am I missing something?

But this gives me the following idea:

I guess what i need in addition to that is a block that based
on s(t) either sends the input to the output when s(t)==0 (which is then connected to A),
or just consumes the input (when s(t)==1).
Is there such a block available? (even if not, this is pretty easy to write!)

thanks for the hints and ideas!
Achilleas

On Wed, Oct 2, 2013 at 5:51 PM, Monahan-Mitchell, Tim wrote:

Can you do this with a 2:1 mux block? Input 2 = constant 0, control input is s(t)?

Sent: Wednesday, October 02, 2013 3:48 PM
Subject: [Discuss-gnuradio] Activating/Deactivating Blocks in real time

I have the following problem that I would like your opinion on how to solve elegantly:

I have a block A (say a standard sync block with some memory--eg an fir filter) which
has input x(t) and output y(t) and is pretty computationally intensive.

I would like to add the following functionality to it:

Add a new input s(t) to A which can be 0 or 1.

When s(t)=1 the block operates as before ie, it processes x(t) to generate y(t).

If s(t)=0 I would like it to output y(t)=0 and consume the appropriate x(t)'s from the input.

This way when s(t)=0 block A essentially "does not work".

This is pretty straightforward to code if I modify the work function of block A.

However, block A for me is a pretty complicated hierarchical block, so I don't have access to its "work" function.

One way to do this is to rewrite the whole hierarchical block A as a flat block and then do as suggested above.

Is there a better way?

Thanks
Achilleas