Re: [Discuss-gnuradio] Good sugestions - gr_fast_atan2() and gr_fast_nco()

[Larry Doolittle]

> 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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