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Participant
6,228 Views
Registered: ‎05-03-2013

## Interpolation FIR vs Interpolated FIR

In the Xilinx FIR compiler there are 2 options for filter type, one is interpolation FIR the other is Interpolated FIR what exactly is the difference and what are the advantages to either. I cannot find any documentation that describes each one independently. The settings seem to not change.

2nd question. It's not clear in the documentation about the coeeficients that are used. I'm assuming that they are for the new upsampled frequency? so the Normalized freuency transfer function is of the interpolated sample rate and not of the original sample rate?

LD.

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3 Replies
Xilinx Employee
6,198 Views
Registered: ‎02-06-2013

## Re: Interpolation FIR vs Interpolated FIR

Hi

The interpolated FIR is a sigle rate system while the interpolation is used in rate change sytems(ie multirate)

There is no inherent rate change when using an interpolated filter – the input rate is

the same as the output rate.

Regards,

Satish

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Participant
6,192 Views
Registered: ‎05-03-2013

## Re: Interpolation FIR vs Interpolated FIR

As I stated in the original email Yes I did look at the documentation.

You never really answered the original question.

So, can you tell me : Is the main difference is that one inserts zeros in the coeffecients a0, 0, 0, 0, a1, 0, 0, 0, a2.... ( between each coeffiecient) and the other adds zeros between each data sample? xn, 0, 0, 0, x(n+1), 0, 0, 0,  x(n+2)... Other than that are they the same?

Leonard.

Visitor
2,348 Views
Registered: ‎04-19-2016

## Re: Interpolation FIR vs Interpolated FIR

i have the same question .

Is the main difference is that one inserts zeros in the coeffecients a0, 0, 0, 0, a1, 0, 0, 0, a2.... ( between each coeffiecient) and the other adds zeros between each data sample? xn, 0, 0, 0, x(n+1), 0, 0, 0,  x(n+2)... Other than that are they the same?