Re: [Discuss-gnuradio] fractional_interpolator_cc?

[Brian Padalino]

On Tue, Oct 21, 2008 at 10:15 AM, Clark Pope <address@hidden> 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