Re: Extraction of shimmer

Hi Debanka!

Interesting! Wasn't aware of that :) Could you anme the book that's from?

So, first of all: you have formulas for some output value – that means you can pretty much
straightforward code that in a GNU Radio block of your own design, both in C++ or in
Python. [1] will guide you to that point.

Now, the formulas make use of a sequence of what they call *amplitudes* Aⱼ. At least for
(8) and (9) it's not quite clear whether these are amplitudes of complete oscillations or
instantaneous amplitudes of signals. Could you clarify what they mean *exactly* with
amplitudes?

If they do mean the amplitude of oscillations, as opposed to instantaneous sample
magnitudes, you'd first need an estimator for these. That would seem to me to be the hard
part to estimate correctly. What do you know about these signals? Are they
single-frequency harmonic signals, or something like square waves, or something else? How
signficantly are you oversampling them?

Best regards,
Marcus

[1] https://tutorials.gnuradio.org

On 3/22/25 11:30 AM, debanka giri wrote:
> Dear Marcus,
>                        I am attaching the pictures for your reference. Please find the
> attachments.
>
> Thanks and Regards
>          Debanka
>
> On Fri, Mar 21, 2025 at 4:19 PM Marcus Müller <mmueller@gnuradio.org
> <mailto:mmueller@gnuradio.org>> wrote:
>
> Hi Debanka,
>
> I don't think "shimmer" is something we use in relation to EM signals. Could you please
> define that, or link to a definition of it?
>
> Best,
> Marcus
>
> On 3/21/25 8:04 AM, debanka giri wrote:
> > Hello,
> >              I want to extract the shimmer from  an EM signal. Could you help me with
> > that? I have an usrp B210.
> >
> > Thanks
> > Debanka
>
>