Re: [Discuss-gnuradio] VOLK: fast way to log10()?

[Brian Padalino]

On Wed, Sep 16, 2015 at 12:24 AM, Dennis Glatting <address@hidden> wrote:
>
> 1) Working with VOLK to learn VOLK.
> 2) Having fun with vectors.
> 3) Generating power data points for plotting across a selected
>    set of samples.

Lastly, another alternative, if you wanted to utilize what is already
there in VOLK, if you wanted to do something like 10*log10(x), you can
also think of it as 10*log2(x)/log2(10) - rewritten to put the
constants together - 10*log2(10)*log2(x), where 10*log2(10) is
3.01029995664.

So convert a vector of floats into log2 then multiply a vector by a
const that is equal to 10*log2(10) to get them to their final value.
Not as efficient, potentially, but still an option if you want to
learn VOLK.

Brian