## What are 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 IIR filters used for?

IIR (infinite impulse response) filters are generally chosen for applications where linear phase is not too important and memory is limited. They have been widely deployed in audio equalisation, biomedical sensor signal processing, IoT/IIoT smart sensors and high-speed telecommunication/RF applications.

**How do IIR filters work?**

Infinite impulse response (IIR) filters are characterized by the fact that they use delayed versions of the input signal and fed-back and delayed versions of the output signal to filter the input to the output.

**What is an FIR filter used for?**

A finite impulse response (FIR) filter is a filter structure that can be used to implement almost any sort of frequency response digitally. An FIR filter is usually implemented by using a series of delays, multipliers, and adders to create the filter’s output.

## What are advantages of FIR filter?

Advantages of FIR filters : FIR filter is always stable It is simple Design complexity generally linear FIR filter are having linear phase response It is easy to optimize Non causal Transient have a finite duration Quantization noise is not much as a problem Round of noise error is minimum

### What does it mean if a digital filter is IIR?

What is an Infinite Impulse Response Filter (IIR)? The infinite impulse response is a type of digital filter that is used in Digital Signal Processing applications. A filter’s job is to allow certain types of signals to pass and block the rest. The infinite impulse response filter is unique because it uses a feedback mechanism.

**What is the use of IIR filter?**

IIR filters are one of two primary types of digital filters used in Digital Signal Processing (DSP) applications (the other type being FIR). “IIR” means “Infinite Impulse Response.”

**What is the FIR filter?**

type of filter in signal processing. In signal processing, a finite impulse response (FIR) filter is a filter whose impulse response (or response to any finite length input) is of finite duration, because it settles to zero in finite time.