[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] fxpt_nco vs rotator ?

From: Sylvain Munaut
Subject: Re: [Discuss-gnuradio] fxpt_nco vs rotator ?
Date: Wed, 31 Dec 2014 05:55:05 +0100

If you need high, deterministic, quantifiable precision, you're
probably better off reimplementing the critical blocks yourself the
way you want.

Most of the default blocks will have numerous optimization for speed
that can sacrifice precision. And this will actually depend on which
version of the volk kernel gets selected (generic / SSE / AVX / ....)
because they use different algorithm and opcodes and such.

I'm pretty sure the rotator SIMD version has spurs because of the
periodic renormalization process, but in any case they're like more
than -130 dB down which makes them irrelevant for all but the most
demanding applications.



reply via email to

[Prev in Thread] Current Thread [Next in Thread]