FIR filter - remove padded zeros

1. Which of the following are the disadvantages of FIR filter?
2. What is zero phase filtering?
3. What is the Z transform of a FIR filter?
4. Which filter is called all zero filter?

Which of the following are the disadvantages of FIR filter?

The primary disadvantage of FIR filters is that they often require a much higher filter order than IIR filters to achieve a given level of performance. Correspondingly, the delay of these filters is often much greater than for an equal performance IIR filter.

What is zero phase filtering?

A filter has a zero-phase response if its frequency response is real-valued. A zero-phase filter must have an odd-number of samples in its support with the origin at the center. If the filter has real coefficients, then the impulse response must be symmetric about the origin, i.e. h(n) = h(-n).

What is the Z transform of a FIR filter?

For an FIR filter, the Z-transform of the output y, Y(z), is the product of the transfer function and X(z), the Z-transform of the input x: Y ( z ) = H ( z ) X ( z ) = ( h ( 1 ) + h ( 2 ) z − 1 + ⋯ + h ( n + 1 ) z − n ) X ( z ) .

Which filter is called all zero filter?

b) FIR filters are sometimes called “all zero” because the poles are always located at z = 0. 2) The impulse response of an infinite impulse response (IIR) filter lasts forever.