One of the simplest possible error-correcting procedures in data transmission. The principle is that the sender repeats the message several times, with the hope that the noisy channel interferes with only a small proportion of these messages and not in a consistent way. Generally, other error-correcting mechanisms such as checksums offer better performance.
Computer
A trivial family of cyclic perfect error-correcting block codes, in which the codewords are formed merely by repeating the message words r times. Considered as (n, k) codes (seeblock code), these codes have n = rk for some k.