I think I just figured it out: The actual interpolation is 1/ the value you
feed it. I assumed the second parm was to be the interpolation factor but
looking at the .cc file I see it's inverted internally. If I put in 0.5 I get
twice the output like I expect. (Tried this previously but it threw an error
somewhere else which I mistakenly thought meant the interp parm had to be >=1).
Thanks> Date: Tue, 21 Oct 2008 10:34:14 -0400> From: [EMAIL PROTECTED]> To:
[EMAIL PROTECTED]> Subject: Re: [Discuss-gnuradio] fractional_interpolator_cc?>
CC: discuss-gnuradio@gnu.org> > On Tue, Oct 21, 2008 at 10:15 AM, Clark Pope
<[EMAIL PROTECTED]> wrote:> >> > I'm not able to get this function to work
correctly. I have it just connected between a snapshot file and an output file.
I set the interpolation factor to 2.0 and the output file ends up half the size
of the input file. It's like it is a decimation block instead of
interpolation?> > How does the rational resampler work out - or can you not
represent> the ratio as a rational number?> > Are you calling it correctly? It
seems as if there is a phase shift> as well as an interpolation ratio being
passed in.> >
http://gnuradio.org/trac/browser/gnuradio/trunk/gnuradio-core/src/lib/filter/gr_fractional_interpolator_cc.cc#L38>
http://gnuradio.org/trac/browser/gnuradio/trunk/gnuradio-core/src/lib/filter/gr_fractional_interpolator_cc.cc#L67>
> There may be an issue here:> >
http://gnuradio.org/trac/browser/gnuradio/trunk/gnuradio-core/src/lib/filter/gr_fractional_interpolator_cc.cc#L49>
> Might be upside down?> > Brian
_________________________________________________________________
Want to read Hotmail messages in Outlook? The Wordsmiths show you how.
http://windowslive.com/connect/post/wedowindowslive.spaces.live.com-Blog-cns!20EE04FBC541789!167.entry?ocid=TXT_TAGLM_WL_hotmail_092008
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
