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Up-sampling a filter

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himadri_debnath

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1. What is the difference between up sampling a signal and up sampling a filter?
2. How a filter is up-sampled practically (not MATLAB command)?
 

FvM

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I guess you are asking about interpolation filter. It's a FIR filter with input rate Fs and output rate n*Fs, n being an integer factor.

See description from Intel FIR II IP core user guide.

Screenshot_20210314-193221_Dropbox.png
 

himadri_debnath

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I guess you are asking about interpolation filter. It's a FIR filter with input rate Fs and output rate n*Fs, n being an integer factor.

See description from Intel FIR II IP core user guide.

View attachment 168058
So the clock frequency of the filter needs to be n*Fs, right? Signal will come at Fs but the filter is operating at n*Fs. Is it working this way.
 

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Sample rate isn't clock frequency. Usually the required clock frequency is at least n*Fs, but may be much higher, e.g. in a sequentially processing audio filter.

You should first understand polyphase (or multi-rate) filters in signal processing terms. Clock frequency is a hardware implementation aspect.
 

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