Gray Codes and Program Memory Quiz

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Questions and Answers

In genetic algorithms, why are Gray codes favored for representing information?

  • They enable parallel processing
  • They lead to faster computations
  • They allow for mostly incremental changes (correct)
  • They result in bigger mutations

What is the Gray code equivalent of the decimal number 13?

  • 1110
  • 1001
  • 1101
  • 1011 (correct)

What is the primary advantage of using Gray codes in computers for program memory addressing?

  • Increasing program speed
  • Minimizing power consumption (correct)
  • Improving memory capacity
  • Enabling complex algorithms

How are the next three numbers in the four-bit Gray code sequence after 0101 determined?

<p>By appending '1' to the eight three-bit numbers in reverse order (D)</p>
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Which type of codes are used to represent alphanumeric data?

<p>Character codes (A)</p>
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What do Gray codes minimize in program memory addressing?

<p>Number of address lines changing state (D)</p>
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What is the process to convert a Gray code number into its binary equivalent?

<p>Adding the MSB in the binary number to the MSB in the Gray code number. (B)</p>
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Which type of Gray code uses non-Boolean symbols for encoding?

<p>n-ary Gray code (A)</p>
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What is the word length for a ternary Gray code (n = 3)?

<p>Two-digit (A)</p>
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In a quaternary Gray code (n = 4), what are the independent digits used?

<p>0, 1, 2, 3 (D)</p>
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What is another term for binary-reflected Gray code?

<p>Binary Gray code (D)</p>
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Which step is taken after obtaining the third MSB during the conversion process from a Gray code to its binary equivalent?

<p>Consider a carry from the addition. (C)</p>
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What is the value of the decimal equivalent of the excess-3 code 1001 0111 0000.0100 0010?

<p>(970.42)10 (B)</p>
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Which property of the Gray code ensures that the maximum error is minimized when encoding data?

<p>Consecutive code words differ by only one bit. (C)</p>
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What is the binary-reflected Gray code equivalent of the decimal number 7?

<p>0010 (B)</p>
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Which of the following statements about the Gray code is true?

<p>The last entry in the code rolls over to the first entry. (C)</p>
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How can the Gray code pattern for a given number of bits be remembered?

<p>The least significant bit follows a repetitive pattern of '2', the next higher bit follows a pattern of '4', and so on. (C)</p>
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What is the maximum number of bits that can differ between two consecutive Gray code words of the same word length?

<p>1 (D)</p>
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Study Notes

Gray Code Conversion

  • The third MSB in the binary number is obtained by adding the second MSB in the binary number to the third MSB in the Gray code number, ignoring any carry.
  • The conversion process continues until the LSB of the binary number is obtained.

n-ary Gray Code

  • The n-ary Gray code, also known as the non-Boolean Gray code, uses non-Boolean symbols for encoding.
  • The generalized representation of the code is the (n, k) Gray code, where n is the number of independent digits used and k is the word length.
  • Examples of n-ary Gray codes include ternary Gray code (n = 3) and quaternary Gray code (n = 4).

Applications of Gray Code

  • Gray codes minimize power consumption in computers by reducing the number of address lines changing state.
  • Gray codes are useful in genetic algorithms as they allow for mostly incremental changes.

Binary-Gray Conversion

  • The binary equivalent of a decimal number can be converted to Gray code by adding the second MSB in the binary number to the third MSB in the Gray code number.
  • Examples of binary-Gray conversion include decimal 13 (binary 1101) to Gray code 1011 and Gray code 1111 to binary 1010.

Alphanumeric Codes

  • Alphanumeric codes, also called character codes, are binary codes used to represent alphanumeric data.
  • Examples of alphanumeric codes include subtracting 0011 from each four-bit group to obtain a new number.

History of Gray Code

  • The Gray code was designed by Frank Gray at Bell Labs and patented in 1953.
  • The Gray code is an unweighted binary code in which two successive values differ only by 1 bit.

Properties of Gray Code

  • The Gray code has the cyclic property, where the last and first entries differ by only 1 bit.
  • The Gray code can be remembered by patterns of repetitive bits, such as the least significant bit following a pattern of ‘2’ and the next higher adjacent bit following a pattern of ‘4’.

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