> 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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