Discrete-time filter

1. What is a discrete-time filter?
2. What is the purpose of a discrete-time filter in a digital signal processing system?
3. What is difference between FIR and IIR filters?
4. What are the types of digital filter?

What is a discrete-time filter?

A discrete-time filter is a discrete-time system which passes some frequency components and stops others. An ideal discrete-time filter is best in frequency selectivity. It passes the frequency components in the pass band distortionlessly and stops the frequency components in the stop band completely.

What is the purpose of a discrete-time filter in a digital signal processing system?

In signal processing, the function of a filter is to remove unwanted parts of the signal, such as random noise, or to extract useful parts of the signal, such as the components lying within a certain frequency range.

What is difference between FIR and IIR filters?

If the impulse response of the filter falls to zero after a finite period of time, it is an FIR (Finite Impulse Response) filter. However, if the impulse response exists indefinitely, it is an IIR (Infinite Impulse Response) filter.

What are the types of digital filter?

There are two fundamental types of digital filters: finite impulse response (FIR) and infinite impulse response (IIR).