Digital filters are of two types. Finite Impulse Response Digital Filter & Infinite Impulse Response Digital Filter.

DIFFERENCE BETWEEN FIR FILTER AND IIR FILTER

STRUCTURES FOR FIR SYSTEMS

 FIR Systems are represented in four different ways

1. Direct Form Structures

2. Cascade Form Structure

3. Frequency-Sampling Structures

4. Lattice structures.

1. DIRECT FORM STRUCTURE OF FIR SYSTEM

The convolution of h(n) and x(n) for FIR systems can be written as