Classification of Numeric Codes || Lesson 28 || Digital Electronics || Learning Monkey ||

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Here we will try to understand the Classification of Numeric Codes.

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Numeric Codes are just part of the Binary Codes Classification. The classification of the binary codes involves Numeric codes and Alpha Numeric Codes.

The Classification of the numeric codes is as shown in the image below.

In the above image, we can understand that the numeric codes are classified into two types.

1. Weighted Codes

2. Un Weighted Codes.

In any type of classification, the objective of the numeric codes is to provide unique codes for each and every decimal digit { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }.

Weighted codes mean the codes were generated based on the positional weights of the bits.

This means the value of the coded decimal digit can be obtained from the sum of the positional weight.

In unweighted codes, the value of the coded decimal digit is not obtained from the sum of the positional weights.

The Weighted codes are again classified again into two types.

1. Positively Weighted codes

2. Negatively Weighted Codes

In positively weighted codes the positional weights are involved only with positive numbers.

Whereas in Negatively weighted codes the positional weights are involved with negative weights.

There are different types of positively and negatively weighted codes are possible.

Out of those we considered only a few coding mechanisms.

The positively weighted codes that we have considered are 8421, 2421, 5211.

The negatively weighted codes that we have considered are 642-3, 84-2-1.

The unweighted codes that we have considered are Excess-3 and Gray Codes.

We haven’t shown any type of Gray codes for the decimal number system.

We will have a separate discussion on gray codes because the coding mechanism used is different from the others.

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