Re: [Discuss-gnuradio] dynamically changing delay in gr_delay (or history in any gr_block)

[Marcus D. Leech]

On 11/15/2011 06:16 PM, Achilleas Anastasopoulos wrote:
> Take a look at the attached grc file:
>
> As implemented, it does not work (changing the delay does not have an effect).
>
> If I introduce the "fictitious" filter (1,0,0,0,0,..)
> it works as expected.
>
> AM I doing something wrong in the first case?
>
> Achilleas
It seems that the runtime machinery pays attention to d_history *only* 
on block init, and at no other time, which leads to unexpected
  results.  But, surely, this must have worked at some point?

I mean, I regularly use filters whose parameters I change dynamically, 
and they apparently do what I want, although, perhaps at the moment
  of changing parameters, the phasing isn't "right", but they seem to work.

Someone with more exposure to the gr-runtime stuff should comment here.


>


--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org