Difference Between Encoder and Decoder

By BYJU'S Exam Prep

Updated on: September 25th, 2023

The Difference Between Encoder and Decoder is that the encoder produces binary code as output, and the decoder receives binary code as an input. Both encoder and decoder are a type of combinational logic circuit. They are used to define one or more output states from one or more input states. Boolean algebra is used to implement the logic.

Difference Between Encoder and Decoder PDF

The encoders and decoders are used for secure data transmission. In the coming sections, we will see the difference between an encoder and a decoder thereafter, we will discuss encoders and decoders in brief.

Difference Between Encoder and Decoder

Apart from the use of the encoder being totally opposite to that of the decoder, there are other differences between the two. The difference between encoder and decoder is important for the Notes are, over the years, various questions have been seen based on this topic.

Key Differences Between Encoder and Decoder

Encoder Decoder
Used to convert raw signals to coded signals. Used to convert coded signals to the original or raw form of signals.

Input- 2n

Output – n

Input – n

Output – 2n

The operation of the encoder is a simple process. The operation of the decoder is a complex process.
Produces coded outputs. Produces active/raw/original outputs.
Uses OR gate. Uses AND gate along with NOT gate.
Examples: video encoders, Emails, etc. Examples: Memory storage devices, microprocessors, etc.

What is an Encoder?

The encoder is a combination logic circuit that converts the input signal into binary code. The encoder is a component that transforms an analog signal into a coded signal and is essential as per the GATE CSE syllabus.

If there are ‘2n‘ inputs in the encoder, then it will generate an ‘n’ number of outputs, which will be a coded signal. For example, if there are 4 inputs in an encoder, it will produce 2 outputs. Similarly, 3 outputs for 8 inputs, and so on

What is a Decoder?

The decoder is also a type of combinational logic circuit. The functioning of a decoder is opposite to that of the encoder. It is used to convert the coded inputs into original signals. The decoder is thus known as the component which is used to transform the coded signal back to the original signal.

If there are an ‘n’ number of input signals in a decoder, it will produce the ‘2n‘ number of outputs. candidates can expect 1-2 questions in alternate years from this topic in the GATE question paper. Internal logic circuits convert the coded signal to the original form.

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