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[Discuss-gnuradio] dynamically changing delay in gr_delay (or history in


From: Achilleas Anastasopoulos
Subject: [Discuss-gnuradio] dynamically changing delay in gr_delay (or history in any gr_block)
Date: Tue, 15 Nov 2011 15:00:05 -0500

I made a simple example with a cosine and a delayed version of that
going through
a multiplier, and observing the output together with a slider that
changes the delay dynamically.
However i do not see any change (eg, elimination of the dc component
when delay ~ pi/2).


Looking at the code of the block gr_delay it shows that the delay can
dynamically change
and this results essentially in a call to set_history() in gr_block.
Looking further into the set_history() method, it sets the private
variable d_history.

The question is: does the dynamic change of history have any effect in gr_block?
What happens in the guts of the block when d_history changes?
and why don't i see any effect in the example above?

thanks
Achilleas



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