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

[Ellie White]

Hi Marcus,

Thanks for your reply. I am not sure how the integration works, but if you know how the Integrate block does the integration, then that is how my flowgraph does it. I suspect it is "sum /reduce /dump" as you mentioned, though perhaps we would need to investigate the Integrate block's source code to be sure? Thanks in advance for any additional suggestions you might have on this!

Cheers,

Ellie

On Sat, Aug 10, 2019 at 7:37 PM Marcus D. Leech <address@hidden> wrote:

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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