Question

Excess 3 code and gray code difference in hindi

Answer 1

Answer:

Gray Code:-

Gray Code is non- weighted code and is a special case of unit-distance code.

In unit-distance code, bit pattern for two consecutive number differ in only one bit position.

These codes are also called as cyclic code for Example;

Gray cod for decimal number 5 is 0 1 1 1 and

Gray cod for decimal number 6 is 0 1 0 1 .

These two codes only differs by one bit position.

This code is extensively used in shaft encoder because of this property.

Gray Code is reflected code.

Gray code can be constructed using following property.

i) A 1 Bit Gray Code has two code words 0 and 1 representing Decimal No. 0 and 1 respectively.

ii) An (n-bit) n>2 Gary Code will have first 2n-1 Gray Codes of (n-1) bit written in order write leading 0 appended.

iii) The last 2n-1 Gray Code will be equal to Gray Code words of an (n-1) bit Gray Code, written in reverse order.

b) Excess-3 Code

This is another form BCD Code, on which each Decimal Digit is coded into 4-bit Binary code.

The code for each Decimal Digit obtained by adding 3 to natural BCD code of the digit.

For Example,2 is loaded as



It is not-weighted code

This code is self – complementing code, which means 1’s complement of the coded number yields 9’s complement of number itself

For Example,

Excess-3 Code for 2 is 0 1 0 1 and it’s 1’s complement is 1 0 1 0 which is Excess-3 code for decimal 7, which is 9’s complement of 2

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