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Add a letter and crack the code! Add a letter and crack the code!
Cyclic redundancy check. A cyclic redundancy check ( CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to digital data. [ 1][ 2] Blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of their contents.
Here, each group of the same letter represents a 4-bit one-bit error-correcting codeword. The codeword cccc is altered in one bit and can be corrected, but the codeword dddd is altered in three bits, so either it cannot be decoded at all or it might be decoded incorrectly. With interleaving:
Yasir Hameed Qureshi (Urdu: یاسر حمید قریشی) (born 28 February 1978) is a former Pakistani cricketer, who played 25 Tests and 56 ODIs for Pakistan. He scored two centuries (i.e., 100 runs or more in an innings) on his Test debut against Bangladesh , becoming only the second player to do so just after Lawrence Rowe .
In code-division multiple access (CDMA) communication, the Hadamard code is referred to as Walsh Code, and is used to define individual communication channels. It is usual in the CDMA literature to refer to codewords as “codes”. Each user will use a different codeword, or “code”, to modulate their signal.
In mathematical terms, Hamming codes are a class of binary linear code. For each integer r ≥ 2 there is a code-word with block length n = 2r − 1 and message length k = 2r − r − 1. Hence the rate of Hamming codes is R = k / n = 1 − r / (2r − 1), which is the highest possible for codes with minimum distance of three (i.e., the minimal ...
Since most such codes correct only bit-flips, but not bit-insertions or bit-deletions, the Hamming distance metric is the appropriate way to measure the number of bit errors. Many FEC coders also continuously measure the current BER. A more general way of measuring the number of bit errors is the Levenshtein distance.
Code word, an element of a codebook designed so that the meaning of the code word is opaque without the code book; Code name, a clandestine name or cryptonym used to identify sensitive information; password, passcode, codeword, countersign; a word that is a special code for access, to pass a challenge of a sentry