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Digital Codes


Computers and digital circuits processes information in the binary format. Each character is assigned 7 or 8 bit binary code to indicate its character which may be numeric, alphabet or special symbol. Example - Binary number 1000001 represents 65(decimal) in straight binary code, alphabet A in ASCII code and 41(decimal) in BCD code.

Types of codes

BCD (Binary-Coded Decimal) code :

Note: 1010, 1011, 1100, 1101, 1110, and 1111 are INVALID CODE in BCD code.

ASCII (American Standard Code Information Interchange) code :

EBCDIC (Extended Binary Coded Decimal Interchange Code) code

Gray code

Excess-3 code


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Error dectecting and correcting schemes

  • Repetition codes
  • Parity bits
  • Checksums
  • Cyclic redundancy checks (CRCs)
  • Cryptographic hash functions
  • Error-correcting codes
  • Error correction
  • Automatic repeat request
  • Error-correcting code
  • Hybrid schemes

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