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No brickwall filter then?

I've seen conflicting information on what the filter requirements are when doing sample rate conversion to a higher rate. Some say that you need to apply the anti-alias filter for the original Nyquist frequency, while I think the more correct answer is that the slope of the filter can now be reduced since the stop band is wider, stretching to the new sample rate Nyquist frequency. Is this the correct answer? If so, that seems like a big advantage, especially if you skip any additional "standard" digital filtering.


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