Hi Kevin,
this is everything but a dumb newbie question! In fact, it explains
quite well what you want to do, you illustrate with a screenshot of the
relevant things, and you describe what happens instead. That makes this
a well-researched, well-presented and thought through question.
So the point is that the GRC repeat block is but a graphical alias for
the gr::blocks::repeat block[1]. As the docs show, that doesn't allow
dynamic setting of the interpolation.
So, this email thread could now address different things:
(0. You kind of reported a bug. Or at least a feature request. If you
want to do this the right way, open a issue on gnuradio.org's issue
tracker.)
1. Do you really need repeat functionality, or are you in fact trying to
adjustably interpolate a band-limited signal, in which case
interpolation with a filter might be the right thing to do? There's a
block that just wraps that nicely (fractional interpolator).
2. Do you want us to help you add that functionality to the repeat
block? I had a look, it's not that hard, and it could get you on the
contributor's list by helping an awesome free software project :) ; I
haven't added that functionality yet, so there might be some surprises
while doing this, but it should work.
Best regards,
Marcus
[1]https://gnuradio.org/doc/doxygen/classgr_1_1blocks_1_1repeat.html
On 26.07.2015 06:07, Kevin McQuiggin wrote:
I should have added that I am running gnuradio version 3.7.7.1 under OSX
10.10.4.
On Jul 25, 2015, at 8:26 PM, Kevin McQuiggin <[email protected]> wrote:
Hi All:
I would like to use a repeat block to stretch the duration of vectored input
dynamically. For example, (0,1,0,1,…) input should become
(0,0,0,1,1,1,0,0,0,…), the repeat count under control of a variable. In this
example the Interpolation parameter would be 3.
I observe that the “Interpolation” value in the Repeat block appears to be set
initially, but does not respond to dynamic changes. Here is a minimalist
flowgraph that shows this behaviour:
<PastedGraphic-2.png>
I would like to be able to use the QT GUI Chooser to select other vales for
variable “test1” and have this dynamically adjust the Repeat block
“Interpolation” value. This doesn’t work. In the example flowgraph,
“Interpolation” is initialized and remains at 2, despite selecting other values
for “test1” when the flowgraph is run.
It is likely a dumb, newbie question, but how can I achieve the desired
behaviour? I have scoured the Wiki, docs, Google, etc, and having not found an
answer, I thought I’d make my first post and ask.
Thanks in advance,
Kevin
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