Re: Compact Fluorescent Noise

[Joerg <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx>]

Hello Jeff,

>
> There doesn't appear to be an effective way to deal with the randomness of
> this kind of noise on a cycle-by-cycle basis.  But then a longer term
> average has its own set of problems.  Eliminating this kind of noise at the
> source may be the best answer.
>

Have you tried narrowing the LC filter? Several kHz wide might still be
ok from a ringing point of view.

The other trick is what radio engineers refer to as a "noise blanker".
If the spike is short enough versus the channel information a riding
threshold detector is set. This detects sharp peaks above a slower
signal and then notches out that portion of the receive phase. The good
ones work remarkably well in muffling irregular spike noise.

While the LC filter should be an easy one the noise blanker does tend to
increase uC workload to the point where one has to tap the cost brakes.

--
Regards, Joerg

http://www.analogconsultants.com