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Fast blue memin read with interpolation

DSP related issues, mathematics, processing and techniques

Fast blue memin read with interpolation

Postby Tepeix » Fri Sep 02, 2022 12:02 pm

(héhé this post has been deleted but with all the spam that was surrounding it i understand why !)

Here's a fast blue array memin reader.
It take the memin and write it in a normal mem in a modified way.

Every SSE will be write like this : sample0,sample-1,sample-2,sample-3

So we could only read one time to get an interpolated result. (Here it's only a linear interpolation)
It's not bandlimited, but if you provide sin like array with frequency below nyquist the aliasing is low.
(I see it more like a table lookup.)

In white i provided an example but it's very bad and glitchy..
Fast attack will read an unloaded array..
Each time a new note is done, it might or not reload the array..
> That's where it seams impossible to manage even is we fix the fast attack...
Attachments
Fast blue array read.fsm
(127.01 KiB) Downloaded 345 times
Tepeix
 
Posts: 352
Joined: Sat Oct 16, 2021 3:11 pm

Re: Fast blue memin read with interpolation

Postby Tepeix » Sat Sep 03, 2022 5:13 pm

For curiosity.. (because this might not be a really optimized way to do, and it do aliasing)

Here's a white fast sin array reader.
It only use an array of 32 memory, which make the aliasing.
The array is load in one cpu cycle each time a new note is done.
(for a 32 memory seams not so hard)

Maybe another interpolation could absorb some aliasing.
But it will take more cpu..
Attachments
Sin poly fast read (32array).fsm
(58.65 KiB) Downloaded 333 times
Tepeix
 
Posts: 352
Joined: Sat Oct 16, 2021 3:11 pm


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