Re: [Discuss-gnuradio] Question about calculating integration times

On 08/10/2019 03:40 PM, Ellie White wrote:
> Hi all,
>
> I hope you're doing well! Thanks again for your help with my questions
> earlier this summer. I've got another thing to ask now; I am in the
> process of configuring a system to record integrated spectra using the
> attached flowgraph, and I am trying to determine how to integrate for,
> say, 60 seconds -- if I want to do this, what should my decimation be,
> and how do I calculate that? I have been able to approximate this by
> trial and error, but I would like to know the calculation behind it.
>
> Thanks in advance for any advice you can provide, much appreciated.
> Have a good afternoon!
>
> Cheers,
> Ellie
>
It kind of depends on how you're doing integration.

An approach that strictly does sum/reduce/dump then you need as many
samples as would occur over your desired integration time.

For a single pole IIR filter, it's a bit trickier, and you'd set the
"Alpha" parameter to:

e^sqrt(sample-rate*integraton-time)

Which will approximate an R-C integrator with the given integration time.

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