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Re: [Discuss-gnuradio] Good sugestions - gr_fast_atan2() and gr_fast_nco
From: |
Larry Doolittle |
Subject: |
Re: [Discuss-gnuradio] Good sugestions - gr_fast_atan2() and gr_fast_nco() |
Date: |
Thu, 7 Jul 2005 13:14:19 -0700 |
User-agent: |
Mutt/1.5.9i |
> I would like to know if someone has developed a nco that use table technique
> to calculate the sin and -cos? It would be nice to make an gr_fast_nco that
> find the values of sin and cos in a table instead of calculate them at each
> nco step.
The traditional way to calculate sin and cos in DSP applications
is with CORDIC. Depending on the hardware's capbilities, it can
dramatically change performance -- but up or down, it's hard to say.
Example implementation:
http://www.worldserver.com/turk/opensource/Cordic.c.txt
Theory reference:
http://www.fpga-guru.com/cordic.htm
- Larry
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