On 11/15/2011 12:00 PM, Achilleas Anastasopoulos wrote: > 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? >
I dont think that set history works quite that way. I made a new delay block in gr-basic. Demo in GRC attached. Here is the implementation: http://gnuradio.org/cgit/jblum.git/tree/gr-basic/lib/gr_basic_delay.cc?h=gr_basic -Josh
delaydemo.grc
Description: application/gnuradio-grc
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