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Applications Of Encoder And Decoder Pdf

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Difference Between Encoder and Decoder

Both encoder and decoder are combinational logic circuits, however, one of the crucial difference between encoder and decoder is that an encoder provides binary code as its output. On the contrary, a decoder accepts binary code as its input. An encoder is a device that converts the active data signal into a coded message format. However, a decoder performs inverse operation of the encoder and thus converts the coded input into original data input.

In order to have secured data transmission , encoders and decoders are employed in a communication system. The encoder and decoder perform encoding and decoding of data at transmitting and receiving end respectively. It is a combinational circuit that is used to convert the input signal in the form of coded output digital data stream. When an input signal is applied to an encoder then logic circuitry involved within it converts that particular input into coded binary output.

As we can see the four inputs provided to the encoder are A 0 , A 1 , A 2 , A 3 and the 2 outputs are given as Z 0 and Z 1. It is noteworthy here that to have the particular binary code at the output of the encoder, out of the 4 inputs, only one of them can be high, for a given time. As we have already mentioned in the previous paragraph, that among all four, only one input will be 1 at a given time. This we can see in the truth table shown above. Despite its advantage of providing the coded output, an encoder sometimes proves as a disadvantageous circuit and results in incorrect code, when 2 or more than 2 inputs are active high.

A decoder is also a combinational circuit as encoder but its operation is exactly reverse as that of the encoder. A decoder is a device that generates the original signal as output from the coded input signal. It basically decodes the coded bits into another format. A decoder converts n bit coded data inputs into 2 n output lines. The particular coded data is converted into original information signal with the help of internal logic circuitry involved within the decoder.

Here, the applied inputs to the circuit are A 0 and A 1 that provides 4 outputs namely Z 0 , Z 1 , Z 2 , Z 3 and E shows the enable signal of the decoder. Here, as we can see in the first row of the truth table that the enable terminal is low, thus no any input is fed to the device. Resultantly, which provide no result at the output. Hence, each combination of input will provide us high output when E will be high. As we are aware of the fact that both are combinational circuits but the operation of the two is exactly reverse of each other.

One performs encoding of the original information signal, while the other decodes the coded data bits in order to have the exact message signal. Please upload difference between MUX and Encoder like this….. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

Key Differences Between Encoder and Decoder The encoder circuit basically converts the applied information signal into a coded digital bit stream. While a decoder performs reverse operation and recovers the original information signal from the coded bits. The applied input in case of an encoder is an active input signal. As against decoder accepts coded binary data as its input. The encoder generates coded data bits as its output that is fed to the decoder. On the contrary, a decoder provides an active output signal original message signal in response to the coded data bits.

The number of inputs accepted by an encoder is 2 n but decoder accepts only n inputs. The output lines for an encoder is n while for the decoder it is 2 n. The operation of an encoder is quite simple but the operation of the decoder is complex as it needs to understand the coding format of the encoder.

In a communication system, the encoder is installed at the transmitting end whereas decoder circuit is installed at the receiving side. Comments Nice article. Leave a Reply Cancel reply Your email address will not be published.

Encoder Applications

Basically, Decoder is a combinational logic circuit that converts coded input to coded outputs provided both of these are different from one another. The name decoder means translating of coded information from one format into another. So the input code generally has fewer bits than output code word. A digital decoder converts a set of digital signals into corresponding decimal code. A decoder is also a most commonly used circuit in prior to the use of encoder.

These are frequently used in communication system such as telecommunication, networking, etc.. Similarly, in the digital domain, for easy transmission of data, it is often encrypted or placed within codes, and then transmitted. At the receiver, the coded data is decrypted or gathered from the code and is processed in order to be displayed or given to the load accordingly. An encoder is an electronic device used to convert an analogue signal to a digital signal such as a BCD code. It has a number of input lines, but only one of the inputs is activated at a given time and produces an N-bit output code that depends on the activated input. The encoders and decoders are used in many electronics projects to compress the multiple number of inputs into smaller number of outputs. The encoder allows 2 power N inputs and generates N-number of outputs.

Types of Encoders and Decoders with Truth Tables & Applications

Prerequisite — Encoder , Decoders. Binary code of N digits can be used to store 2 N distinct elements of coded information. This is what encoders and decoders are used for. Encoders convert 2 N lines of input into a code of N bits and Decoders decode the N bits into 2 N lines. Encoders — An encoder is a combinational circuit that converts binary information in the form of a 2 N input lines into N output lines, which represent N bit code for the input.

Before going into realities about Encoders and Decoders , let us have a concise thought regarding Multiplexing. Regularly we go over applications where it is expected to nourish a few input signals to a solitary load, each at once. This procedure of choosing one of the input signals to be fed to the load is known as Multiplexing. The invert of this operation, i. Similarly in a digital domain, for simplicity of transmission of information, the information is regularly scrambled or set inside codes and afterward, this secured code is transmitted.

Four Channel wireless system. Basic four channel wireless. Relays, The Electromechanical amplifier.

Both encoder and decoder are combinational logic circuits, however, one of the crucial difference between encoder and decoder is that an encoder provides binary code as its output. On the contrary, a decoder accepts binary code as its input. An encoder is a device that converts the active data signal into a coded message format.

Designing of 2 to 4 Line Decoder

In digital electronic projects, the encoder and decoder play an important role. It is used to convert the data from one form to another form. Generally, these are frequently used in the communication systems like telecommunication, networking, and transfer the data from one end to the other end. In the same way it is also used in the digital domain for easy transmission of data, placed with the codes and then transmitted.

Combinational logic is the concept in which two or more input state define one or more output state. Encoder and Decoder are the combinational logic circuits. In which we implement combinational logic with the help of boolean algebra. To encode something is to convert an unambiguous piece of information into a form of code that is not so clearly understood and the device which performs this operation is termed ad Encoder. Encoder : An Encoder is a device that converts the active data signal into a coded message format or it is a device that coverts analogue signal to digital signals. It is a combinational circuit, that converts binary information in the form of a 2N input lines into N output lines which represent N bit code for the input. When an input signal is applied to an encoder then logic circuitry involved within it converts that particular input into coded binary output.


The encoders and decoders are used in many electronics projects to compress the multiple number of inputs into smaller number of outputs. The encoder allows 2 power N inputs and generates N-number of outputs. For example, in encoder, if we give 4 inputs it produces only 2 outputs.


Types of Binary Decoders,Applications

Introduction Of Decoder

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Different Types of Encoder and Decoder and Its Uses

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Applications of the Encoder and Decoder. Speed synchronization of multiple motors in industries. War field flying robot with a night vision flying camera. Robotic vehicle with the metal detector. RF based home automation system. Automatic health monitoring systems.

Adalbaro A. 25.12.2020 at 12:59

Encoders translate rotary or linear motion into a digital signal.

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