These codes are called “Error detecting codes”. We use some redundancy codes to detect these errors, by adding to the data while it is transmitted from source (transmitter). This can be achieved by first detecting the errors and then correcting them.Įrror detection is the process of detecting the errors that are present in the data transmitted from transmitter to receiver, in a communication system. For effective communication, data should be transferred with high accuracy. If these errors are not detected and corrected, data will be lost. In digital communication system errors are transferred from one communication system to another, along with the data. This type of errors occurs in serial communication and they are difficult to solve. These burst bits changes from transmitter to receiver, which may cause a major error in data sequence. These set of bits are called “Burst error”. The numbers between 4th and 6th bits are also considered as error. Here we identify the error form fourth bit to 6th bit. The burst error is calculated in from the first bit change to last bit change. The change of set of bits in data sequence is called “Burst error”. This type of error occurs in both serial type and parallel type data communication networks.
If there is change in two or more bits of data sequence of transmitter to receiver, it is called “Multiple bit error”. This type of error occurs only in parallel communication system, as data is transferred bit wise in single line, there is chance that single line to be noisy. Occurrence of single bit error is very rare in serial communication system. The change in one bit in the whole data sequence, is called “Single bit error”. There are generally 3 types of errors occur in data transmission from transmitter to receiver. In a data sequence, if 1 is changed to zero or 0 is changed to 1, it is called “Bit error”. In this case, the data error is likely to be changed in positions of 0 and 1. Generally the data transfer in digital systems will be in the form of ‘Bit – transfer’. Even one bit of change in data may affect the whole system’s performance. The data errors will cause loss of important / secured data.
In this case, the input data is not same as the received output data. It may be affected by external noise or some other physical imperfections. The data can be corrupted during transmission (from source to receiver).
Almost in all electronic devices, we find errors and we use error detection and correction techniques to get the exact or approximate output. The change in position of single bit also leads to catastrophic (major) error in data output. This sequence of bits is called as “Data stream”. In digital systems, the analog signals will change into digital sequence (in the form of bits). How the Hamming code actually corrects the errors?.
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