[time-nuts] PLL Math Question
Bob Stewart
bob at evoria.net
Thu Mar 13 00:35:34 EDT 2014
Hi Daniel,
re: FIR vs IIR
I'm not a DSP professional, though I do have an old Smiths, and I've read some of it. So, could you give me some idea what the FIR vs IIR question means on a practical level for this application? I can see that the MA is effective and easy to code, but takes up memory space I eventually may not have. Likewise, I can see that the EA is hard to code for the general case, but takes up little memory. Any thoughts would be appreciated unless this is straying too far from time-nuts territory.
Bob
>________________________________
> From: Daniel Mendes <dmendesf at gmail.com>
>To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
>Sent: Wednesday, March 12, 2014 11:13 PM
>Subject: Re: [time-nuts] PLL Math Question
>
>
>This is a FIR x IIR question...
>
>moving average = FIR filter with all N coeficients equalling 1/N
>exponential average = using a simple rule to make an IIR filter
>
>
>Daniel
>
>
>
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