Error control coding in digital communication method using the transmission control errors generated in order to improve the accuracy of digital message transmission. Received a guarantee of data integrity and accurate method. Because the actual phone line is always imperfect. Data transmission may become disordered or lost. To catch these errors, the sender will send data to the modem to perform a mathematical operation, and the result of the operation together with the data sent, the modem receives data it receives data to perform the same operation, and compare the two results . If the data is destroyed during transmission, then the two results on the inconsistency, the modem receives data on the sender to resend the data, please Classification errors Errors in the communication process can be divided into two categories: one is the thermal noise caused by the random error; the other is the noise caused by the conflict burst errors. IMPACT localized burst errors, and random errors affecting the overall situation.
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