Polyphase "roll-off frequency"

[pq7]

For ResamplePolyphaseFixedInit, what exactly is the rollf parameter? It's described as the "roll-off frequency of the filter."

In the examples it's always 0.95, e.g.

ippsResamplePolyphaseFixedInit_16s(inRate,outRate,2*(history-1), 0.95f, 9.0f, state, ippAlgHintFast);

And we get another hint here:

ippStsBadArgErr
Indicates an error when rollf is less than or equal to 0 or is greater than 1

So it seems to be normalized. Is it another term for cutoff/corner frequency?

[NoorjahanSk_Intel]

Hi,

Thanks for reaching out to us.

We are looking into it. We will get back to you soon.

Thanks & Regards

Noorjahan

[Andrey_B_Intel]

Hi pq7.

The "roll-off frequency"  is "freq" argument of sinc-filter and here it is 'cutoff' frequency relative to sampling frequency but 1.0 means half of sampling frequency so range is (0.0, 1.0)

Andrey

[Ruqiu_C_Intel · Accepted solution]

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