Re: [Discuss-gnuradio] how to average a steam

[Eric Blossom]

On Thu, May 22, 2008 at 04:43:23PM +0200, Wolfgang Buesser wrote:
> Hi,
> 
> what is the simplest way to caluclate the average of a stream?
> 
> I generate a stream of fixed length using head(). I would like to
> calculate the linear average (i.e.
> sum_of_all_samples/number_of_samples).
> 
> Thanks
>       Wolfgang
> 

Depending on your exact needs, an IIR filter will do a reasonable job
of computing a running approximation to the average value of a stream.

See gr_single_pole_iir_filter_*

  http://gnuradio.org/doc/doxygen/classgr__single__pole__avg__filter__ff.html
  http://gnuradio.org/doc/doxygen/classgr__single__pole__iir__filter__cc.html

Absent a better idea, start with alpha == 0.001

Eric