On Wed, 2015-09-16 at 12:49 -0400, mle...@ripnet.com wrote:
> Sure, but if the flow-graph basically is decimated 10:1 by the time
> it reaches the log10, improvements in log10 are going to have very
> little impact. It is, I would assert, boldly and perhaps brashly,
> that log10 operations almost never need to be done at "line rate",
> since they are an artifice imposed by wanting to use standard
> engineering units. There's very little need to do internal DSP math
> in
> standard engineering units...
>
You are probably right but you also probably know what you are doing.
GNURadio is also a learning tool. As such, those of us who do not know
what they are doing, would find log10() and other mathematics useful as
we're reading/studying texts and specs. After a while, hopefully, we
figure things out.
It would also be nice to have a VOLK kernel that multiples a vector by
a constant:
void
volk_32f_s32f_multiply( float* vecbuffer,
const float scalar,
unsigned int num_points )
And an alias for volk_32f_s32f_normalize(): volk_32f_s32f_divide().
These would somewhat map to operations in MATLAB with less learners
asking "how do I...?".
>
> On 2015-09-16 12:39, Martin Braun wrote:
>
> >
> > On 15.09.2015 20:35, Marcus D. Leech wrote:
> >
> > > Ordinarily, one does a log10 to convert into engineering units at the
> > > back of, for example, a power-measurement chain. There's usually no
> > > reason to do that in the middle of a flow-graph, where things can stay in
> > > linear units.
> >
> > That's true, but it's also useful to accelerate operations at the end of
> > a flowgraph :)
> >
> > The rest of the thread is already discussing the technical details, but
> > if there's a good way to implement log10 kernels, I'm sure they'd come
> > in handy.
> >
> > M
> >
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> >
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> >
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