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Any Whittaker–Shannon Interpolation module?

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Any Whittaker–Shannon Interpolation module?

Postby Nowhk » Sat May 05, 2018 9:50 am

Hi there,

I've a collection of 100 samples that describe a discrete signal (from 1hz to 40hz), and I'd like to plot a graph that show the analog/continuos-bandlimited signal after an ideal DAC.

Is there any Whittaker–Shannon Interpolation module out of the box that will already draw it?
Or somethings made by community in these years that emulate this?

Thanks
Nowhk
 
Posts: 275
Joined: Mon Oct 27, 2014 6:45 pm

Re: Any Whittaker–Shannon Interpolation module?

Postby martinvicanek » Sat May 05, 2018 7:37 pm

Here is one for sample size power of two.
Attachments
SincInterpolation.fsm
(8.9 KiB) Downloaded 770 times
User avatar
martinvicanek
 
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Re: Any Whittaker–Shannon Interpolation module?

Postby Nowhk » Mon May 07, 2018 9:13 am

martinvicanek wrote:Here is one for sample size power of two.

Thanks for the help and the fancy module :) Tried to edit the input signal with a sin. But it messes the graph, not sure why:

sine.png
sine.png (41.57 KiB) Viewed 8038 times

Here's the DSP code:

Code: Select all
streamin sr;
streamin freq;
streamout x;
float i=0;
x = sin1(i/sr);
i = i + sr/freq;


Schematic:
SincInterpolation_Sine.fsm
(10.04 KiB) Downloaded 772 times

Sometimes, it draw correctly :) Where's the bug? Thanks
Nowhk
 
Posts: 275
Joined: Mon Oct 27, 2014 6:45 pm

Re: Any Whittaker–Shannon Interpolation module?

Postby Nowhk » Mon May 07, 2018 9:28 am

I think I've got it! I just need to retrigger the [F] SyncInterpolation module, so it propagates the changes ;)

Thanks boss!!!!
Nowhk
 
Posts: 275
Joined: Mon Oct 27, 2014 6:45 pm


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