[SI-LIST] Re: DC data
- From: olaney@xxxxxxxx
- To: jennifer.maharani@xxxxxxxxx
- Date: Tue, 23 Jun 2009 10:14:17 -0700
The answer depends on what you are actually measuring. Do you want the
instantaneous phase? Peak amplitude? Long term RMS value? The optimal
strategy is different for each. Then there is the question of whether
your sine wave is at a fixed frequency or can wander around. That also
affects the optimal strategy. Finally, is your noise in-band or not, or
random spikes, or low frequency baseline wander, or ?? That also matters.
Do you have access to the drive signal or just have to use whatever
comes in? You can use filtering (fixed or tracking), signal averaging,
spike clippers or squelchers, fourier transforms and algorithms of all
kinds, but you have to choose between them according to your answers to
these considerations.
Orin Laney
On Tue, 23 Jun 2009 18:36:57 +0200 Jennifer Maharani
<jennifer.maharani@xxxxxxxxx> writes:
> Many thanks for the reply. Let me put it this way. Let's say I have a
>
> noisy data that follows a sinusoidal curve. This data is in time
> domain. How can I get a smooth sinusoidal curve?
>
> I can also put it in a different way. My data is a sinusoidal curve
>
> with say 2mV peak-to-peak dynamic noise.
> How can I get a smooth clean sinusoidal curve.
>
> I hope I described it in a clear way.
>
> Many thanks,
> Jenni
>
>
>
> On Jun 23, 2009, at 5:22 PM, Joseph.Schachner@xxxxxxxxxx wrote:
>
> > I'm not sure I understand the question.
> >
> > You wrote:
> > I have a set of noisy transient data where the DC level moves up
> and
> > down.
> > Is the DC moving up and down due to the transients? I mean, does
> it
> > look
> > like this, where the "DC" is lower after a positive transient?:
> > (Embedded image moved to file: pic22704.jpg)
> >
> >
> > Or is the DC slowly varying and has nothing to do with the
> transients?
> >
> > The answer is different for these two possibilities.
> >
> > --- Joe S.
> > <pic22704.jpg>
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