Filter

The number of multiplications per second required by the system

The number of multiplications per second required by the system
  1. What is anti imaging filter in multirate signal processing?
  2. What is the need for anti imaging filter after up sampling a signal?

What is anti imaging filter in multirate signal processing?

Anti-Imaging filter : Low pass filter removes image frequencies created by the rate increase to yield y[n]. Interpolation by a factor of 'L'

What is the need for anti imaging filter after up sampling a signal?

An "anti - aliasing" or "anti-imaging" channel / filter is set before the A-to-D converter, to counteract / prevent flag frequencies more noteworthy than a large portion of the testing rate from being digitized, which would create pictures at undesirable frequencies.

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While calculating the power spectral density (PSD), why is there a roll-off at the end depending on the sampling rate?
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