On Wed, May 2, 2012 at 2:55 PM, Marcus D. Leech <[email protected]> wrote:
> I have been in the habit of using complex-bandpass filters even when I'm > just looking for a symmetric response. I did some measurements > today and found a 40-45% performance advantage to using a low-pass real > filter when a symmetric response is desired. What's the "crux" > of the performance difference? > > Needless to say, I ran around and changed all my recent "stuff" to use > low-pass filters :-) Complex * complex multiplies are more computationally expensive than complex * real. For edification and titillation you can read the volk_32fc_x2_multiply_32fc source. There's an Orc version too which is easier to read. The moral of the story is you should probably avoid complex coefficients unless you know you need them. --n > > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > > ______________________________**_________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/**listinfo/discuss-gnuradio<https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> >
_______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
