Re: Software PLL (SPLL)

In article <1139427882.792589.126890@f14g2000cwb.googlegroups.com>,
Ron N. <rhnlogic@yahoo.com> wrote:
>Tim Wescott wrote:
>> Implementing a PLL in software uses the same basic theory as
>> implementing a PLL in hardware -- you compare your synthesized signal to
>> a reference, generate a phase difference, then servo the frequency of
>> your synthesized signal to your reference.
>
>Why?  Isn't a software PLL just a forward interpolator.  Why not just
>estimate (statistical, FFT, phase vocoder or otherwise) the frequency,
>phase, derivatives of phase, etc.; generate a forward interpolation of
>the input reference using that information, and call that the output of
>the PLL NCO?  Recalculate periodically (every sample if the compute
>power is available).

Now fit that FFT into a PIC.


-- 
--
kensmith@rahul.net   forging knowledge