Explain the difference between FIR and IIR filters in digital signal processing.

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Answered by suresh

Explain the Difference Between FIR and IIR Filters in Digital Signal Processing

In digital signal processing (DSP), Finite Impulse Response (FIR) filters and Infinite Impulse Response (IIR) filters are two fundamental types of filters used to process digital signals. Understanding the difference between these two types of filters is crucial in signal processing applications.

Finite Impulse Response (FIR) Filter

An FIR filter is a type of digital filter that has a finite impulse response. In other words, the output of an FIR filter is only influenced by a finite number of past input samples. FIR filters are often characterized by their linear phase response, which makes them suitable for applications where phase distortion must be minimized. FIR filters are stable and robust, and they can easily be designed to have linear phase characteristics.

Infinite Impulse Response (IIR) Filter

On the other hand, an IIR filter is a type of digital filter that has an infinite impulse response. This means that the output of an IIR filter depends on an infinite number of past input samples. IIR filters are characterized by their recursive nature, which allows them to achieve a desired frequency response with fewer parameters compared to FIR filters. However, IIR filters are more prone to stability issues due to their feedback structure.

Key Differences

  • FIR filters have a finite impulse response, while IIR filters have an infinite impulse response.
  • FIR filters are characterized by their linear phase response, while IIR filters may have non-linear phase response.
  • FIR filters are typically more stable than IIR filters due to their feedforward structure.
  • IIR filters can achieve desired frequency responses with fewer parameters compared to FIR filters.

In conclusion, both FIR and IIR filters have their advantages and disadvantages, and the choice between them depends on the specific requirements of the signal processing application.

Answer for Question: Explain the difference between FIR and IIR filters in digital signal processing.