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Ideal Filter & Real Filter:

Sometimes, for the reason of simplification, we often use the active filters to approximate ways. We upgrade them into an ideal and theoretical model, which is called ‘Ideal Filter.’
The use of these standards is insufficient, leading to errors; then, the filter should be treated based on accurate real behavior, i.e., as a ‘Real filter.’

The main key terms of an ideal filter are

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  A gain unit
  
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  Complete degradation of the input signal across the bands.
  
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  The transition of response from one zone to another is quite abrupt.
  
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  It does not create any distortion when the signal passes through the transit zone.
  

What are the differences between the Low pass filter & High pass filter?

What are the advantages of a Low Pass Filter?

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  Low-Pass filters can easily remove aliasing effects from a circuit, which makes the circuit working smoothly.
  
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  Low-Pass Filters are cost-effective so that it can be used easily.
  
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  Low-Pass Filters have low output impedance; thus, it prevents the filters cut-off frequency from being affected because of the load.
  

Applications of a Low Pass Filter:

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  A low-pass filter is used in ‘hiss’ filters.
  
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  LPF is used in audio speakers to reduce high frequency.
  
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  LPF can be used as an audio amplifier and an equalizer.
  
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  In Analog to Digital converter, LPF is used as anti-aliasing filters to control signals.
  
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  LPF is used in image smoothening, image blurring.
  
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  LPF is also used in radio transmitters to block harmonic emissions.
  
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  These filters are used in music systems to filter the high-frequency sounds, causing echo at higher sounds.