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What Is Odd Parity Bit?

by Rudresh Ratnaparkhe
Odd Parity Bit

Do you want to know the odd parity bit, what does it mean? Then you have come to the right place here you will come to know about the odd parity in detail. I will tell you each thing that is important and must be known. You will come to know the related points of even-odd parity bits in this article. I will explain the difference between odd parity and even parity so you will understand more in detail. You would like to know what is odd parity bit so let us start and know its definition.

What Is Odd Parity Bit?

An odd parity bit is a check bit that is applied to a series of binary codes. The term odd parity relates to parity testing modes in which each sequence of transmitted bits contains an odd number of bits. Odd parity happens when the overall number of ones in the data plus the parity bit is an odd number of ones. 

If the data already has an odd number of ones, the inserted parity bit has a value of 0, otherwise, it has a value of 1. If the count is odd, the parity bit value is set to 1, resulting in an equal overall count of attempts of 1s in the whole set including the parity bit.

What Is Odd Parity?

An example will help to illustrate odd parity more precisely. Consider the received message 1010001, which includes three ones. By adding a zero, this is converted to odd parity, resulting in the series 0 1010001. As a result, the total number of ones remains at three, which is an odd number. Memory storage systems are tested using odd parity checking. Both the sender and the recipient must agree to use odd parity checking. It is difficult to connect successfully without this. Parity tests can detect data corruption if an odd number of bits are switched during transmission.

Odd Parity Scheme

In an odd parity scheme, the 8 th bit from the parity bit, is set to 1. This occurs when the number of 1s from the seven data bits is even which results in an odd number of 1s in the 8-bit byte. If the number of 1s in the data is odd, it is set to 0.

Odd Parity Generator

The odd parity bit generator is a combinational circuit that receives an n-1 bitstream data and produces the extra bit that will be distributed with the bitstream. This extra or additional bit is known as a parity bit. The parity bit is an odd parity bit scheme is ‘1′ if there are an even number of 1s in the data stream and ‘0′ if there are an odd number of 1s in the data stream. The odd parity bit calculator and generator are the necessary things for solving the issues and checking the parity.

3 Bit Odd Parity Generator

In an odd parity generator of 3-bit, the message signal of the 3 bit at the transmission end is required to be sent. Where the created parity bit, P, will be the product of 3-bit odd parity generation. For the odd parity bit, the total number of 1s in the input bits must be odd. If the cumulative number of 1s in the input bits is odd, P is assigned the value 0, otherwise, P is assigned with the value 1.

3 Bit Odd Parity Generator

4 Bit Odd Parity Generator

If there are four bits, then the four-bit odd parity generator is required. The output odd parity bit is now determined by four input bits, namely A, B, C, and D.

4 Bit Odd Parity Generator

5 Bit Odd Parity Generator Logic Circuit

In the following, I have mentioned the logic circuit diagram of the 5-bit odd parity generator.

5 Bit Odd Parity Generator Logic Circuit

Odd Parity Checker

It is a logic circuit that tests for potential transmission errors. Depending on the form of parity produced at the transmission end, this circuit may be an even or odd parity checker. The number of input bits must still be odd as this circuit is used as an odd parity checker.

Consider sending a three-bit message with an odd parity bit to the receiving end then a 3-bit odd parity checker is required. 

The odd parity checker circuit collects these four bits and scans the data for errors. If the total number of 1s in the data is odd, there is no error; if the total number of 1s is even, there is an error since the data is sent with odd parity at the receiving end.

Value Of Odd Parity Bit

If the count is odd, the parity bit value is set to 1, resulting in an even overall count of appearances of 1s in the whole set of the parity bit. If the number of 1s in a given range of bits is already even, the sum of the parity bit is 0. The coding is changed in the case of odd parity.

Difference Between Even And Odd Parity

Here is the difference between the odd and even parity. Let see what it is in the following.

  • An odd parity scheme sets the parity bit to 1 if the number of 1s in the seven data bits is also greater than the number of 1s in the eighth bits. If the number of 1s in the seven data bits is odd with the complete number of eighth bits in an even scheme, the parity bit is 1. 
  • Odd parity generates an odd number of 1s in an eight-bit byte. Even produces an even number of 1s in the eight-bit byte.
  • The scheme is odd if the number of 1s in the data is odd and it is set to 0. The number of 1s in the data is even in the even scheme parity, and it is set to 0.

FAQ

What Is Even And Odd Parity Bit?

An odd parity bit is a check bit that is applied to a series of binary codes. The term odd parity relates to parity testing modes in which each sequence of transmitted bits contains an odd number of bits. Odd parity happens when the overall number of ones in the data plus the parity bit is an odd number of ones. 

Whereas, even parity is an asynchronous communication network parity checking mode that utilizes an extra digit. A parity bit is a digit like this. If a one-byte data object has an even number of one bit, it is set to zero. The parity bit is set to one if the sum of the one-bit values is an odd number.

What Is The Difference Between Even Parity And Odd Parity?

The difference between odd parity and even parity is given as follows.

  • Odd parity generates an odd number of 1s in an eight-bit byte. Even produces an even number of 1s in the eight-bit byte.
  • An odd parity scheme sets the parity bit to 1 if the number of 1s in the seven data bits is also greater than the number of 1s in the eighth bits. If the number of 1s in the seven data bits is odd with the complete number of 8 bits in an even scheme, the parity bit is 1. 
  • The scheme is odd if the number of 1s in the data is odd and it is set to 0. The number of 1s in the data is even in the even scheme parity, and it is set to 0.

How Do You Calculate Odd And Even Parity?

You can calculate odd parity and even parity as per the following:

  • In the case of odd parity, it is calculated by checking the parity bit value is 0, if the number of ones is odd. The parity bit size is 1 when the number of 1s is even.
  • Even is determined when the number of 1s is even; otherwise, the parity bit value is 0. The parity bit size is 1 where the number of 1s is odd.

What Is Parity Bit With Example?

A parity bit is a single bit that can be appended to a binary series. This is also called in general a check bit. It is set to 1 or 0 to determine if the cumulative number of 1-bits is even or odd. For example, an odd parity considers the received message 1010001, which includes three ones. By adding a zero, this is converted to odd parity, resulting in the series 0 1010001.

Conclusion

In this article, we learned what is odd parity bit in general. You now understand what odd parity means. We saw the important points that were related to odd parity in the above. I told you about odd and even parity. While reading this data, you became aware of the difference between them both. You came to know how you can generate and check the odd parity. In the up, I explained about the generator logic circuit and checker for the odd parity which will help you in the future. 

You may also be interested while reading answers about the commonly asked questions that were mentioned above. While reading them you must have understood the odd parity bit more simple way.

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