Spline interpolation?

HI Joseph:

If there is a specific equation you need to implement for doing your interpolation, please u post it. This way we could comment weather if you can do this with Basic DSP blocks or you would need to contract someone that would write to you a dedicated library.

Why do you need the higher precision?

What's your application? if I may ask.

Lastly, what DSP are you using?

Regards

Miguel

Hi,

We don't have a specific formula I can share, but we'd like to have something smoother than a linear interpolator for signal processing. Piecewise linear interpolation creates significant distortion when applied to audio signals. Basically I want a better defined clipper/distorter that I have much more control over.

Ideally, I'd want to see an object just like the linear interpolator, only that outputs a (cubic) spline interpolation instead of a linear interpolation between points. It would be great to have something where I can add a small number of control points, and have it output a nice softly interpolated curve instead of a piecewise linear output. This is a very common thing to have available and is really quite trivial to do. But I don't see that there is any convenient way to do this in SigmaDSP, but I've seen other clever things before.

I'm using the ADAU1701.

Thanks.

Joe

HI Joe:

There is a linear interpolator and there is Linear interpolator within a log transformation.

Can you share the one you are specifically talking about, perhaps post a screenshot of it?

Thank you

Miguel

I was talking about the simple linear interpolator; having a log transform won't change anything related to these issues. I'm unclear what you want a screenshot of.

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