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Gray Code to True Binary Code Converter

IP.com Disclosure Number: IPCOM000097599D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Hennessey, TJ: AUTHOR

Abstract

The circuit converts Gray or Reflected Binary code information to true binary form. Table 1 illustrates 3-bit representation of the two codes from 0 through 7. The circuitry which converts the incoming Gray code signals to their binary counterpart operates as follows.

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Gray Code to True Binary Code Converter

The circuit converts Gray or Reflected Binary code information to true binary form. Table 1 illustrates 3-bit representation of the two codes from 0 through 7. The circuitry which converts the incoming Gray code signals to their binary counterpart operates as follows.

Table 1 shows the most significant bit in the two codes is always the same. The Gray code bit entering on line G1 is connected directly to the most significant binary digit on line B1. The succeeding Gray code bits are complemented if the true binary form of the preceding Gray code bit is a 1. No complementing is necessary if the true binary form of the preceding Gray code bit is a 0.

The decimal number 4 in Gray code is represented by a 1, 1, 0 on inputs G1, G2 and G3, respectively. The history of each bit is indicated as the signals are processed by the AND circuits, OR circuits and inverters. The binary representation of the incoming signal appears on terminals B1, B2 and B3 as a 1, 0, 0, respectively.

The 1 signal on G2 is complemented to appear as a 0 on line B2, since the preceding true binary on line B1 was a 1. The signal on line G3 is not complemented, since the output on line B2 was a 0. The operation continues until all the Gray code bits are converted. Additional stages such as Gn and Gn-1 can be utilized for converting additional Gray code bits.

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