No problem! Like Marcus says I definitely have to think hard about the
implementation and benchmark... But it's an interesting special case. Would
be neat with a special block for it that also calculates the coefficients.
--Albin
On Wed, Apr 24, 2019, 10:39 Derek Kozel wrote:
> Oops,
Oops, accidentally went direct rather than through the list.
It would be a good addition to gr-filter to be able to use the CPU
operations optimized halfband out of the box.
Previous message
Hi Albin,
The Filter Design Tool will generate Halfband taps that can be loaded
into the
Hi Albin,
Don't know what Derek suggested, but be aware that our "straight" FIR
filter decimators are already polyphase implementations, and use SIMD
(through VOLK) heavily (run volk_profile if you want to make maximum
use of that advantage); it might be that on paper, the number of
operations
Thanks for the reply Marcus. Interesting approach for sure! Will have to
think about it...
Derek, your solution works but it will be 4 times slower than the example I
linked to.
--Albin
On Tue, Apr 23, 2019, 18:24 Müller, Marcus (CEL) wrote:
> Hi Albin,
>
> I'm very very tired right now,
Hi Albin,
I'm very very tired right now, but me and Felix came to the following
conclusions on our *Whiteboard Of Wisdom, Smarts, Expertise,
Rationality and Science* (WOWSERS):
1. A Nyquist-M bandpass filter, esp. a halfband, has zeros on every
other tap – except for the one center tap, which is
Just checking before I write one, is there a half band
decimator/interpolator in gnuradio I haven't been able to find...
Optimized like this:
http://liquidsdr.org/doc/resamp2/
Or is there an even better option for interpolation by 2?
--Albin
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