Digital filter and its advantages and disadvantages!

When designing a digital filter, it is important to follow step-by-step instructions from specifications to implementation. All design possibilities are open to all designers. Most digital signal processing experts use some digital filter theory, especially for major research efforts, and approaches to calculating the filtering coefficient.

What is a digital filter?

This is a network or precision system that can change the waveform, amplitude, phase, frequency, and other characteristics of a signal. The main purpose of using the filter in digital signal processing is to improve signal quality by reducing noise by subtracting or combining the desired part of the signal. Basically, in signal processing technology, this is an algorithm implemented by software and hardware to create the digital output signal of the input signal in the desired way. It works with a routine filtering algorithm that displays some variables, numbers, or digitized analog signals on certain hardware or software.

Within the analog input, some steps with real-time digital filter. First, the bar restriction limits the analogue signal to transform a periodic pattern and transform it into a series of binary patterns. Secondly, a processor is used to process these input sequences with output sequences with some calculation mathematical algorithm. Then, the processed signal transducers reduce the unwanted components in an analogue signal.


  • Linear phase response.
  • Thermal and environmental versions can not change performance.
  • This is the so-called adaptive filter, because the frequency response can be set automatically by executing the programmable processor.
  • It is possible to filter multiple input sequences without hardware replication.
  • All data can be stored
  • It has a repeatable power unit.
  • Operating level is low frequency, therefore the use of the analog system is inappropriate.


  • In reality, the digital sequence has much less bandwidth than the analog sequence. The processing speed is a key factor in calculating the performance of a complete device. In fact, the speed mode depends entirely on the number of the arithmetic operation of the processor.
  • Finite word length, which results in the effects of quantization noise and rounded noise, is also a significant disadvantage in the calculation.
  • It takes a much longer time to design and develop digital sequences, though it can be applied to other tasks or applications. Computer-aided design is usually a good support to turn it into pleasant tasks.

Source by Alamgir Mahmud

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