4th Semester Notes


           Subjects:

    1. Operating System
                2. Numerical Methods
      • Notes
      • Lab Report
      • Solution
                3. Scripting Language
      • Notes
      • Lab Report
      • Assignment                         
                4. Database Management System
                  


                



    

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Error Detection And Correction Codes (Digital Logic)

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Basic approach used for error detection is the use of redundancy, where additional bits are added to facilitate detection and correction of errors.  Popular technique are:  Simply Parity Check Two-dimension parity check Checksum Cyclic redundancy check Parity method for Error Detection Table: Message with even parity and odd parity Even Parity  Definition: In even parity the number of bits set to 1 in a data item, including the parity bit itself is always even. If the number of 1s in the data is odd, the parity bit is set to 1 to make the total number of 1s even. Odd Parity Definition: In odd parity the number of bits set to 1 in the data item including the parity bit is always odd. If the number of 1s in the data is even the parity bit is set to 1 to make the total number of 1s odd. Notes: - Parity method is only for the error detection not for the error correction. -  This method provide for the detection of single bit error (or any odd number of errors, which is...
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