| 单词 | compression |
| 释义 | compression A means of reducing the amount of data to be transmitted or stored. Compression is pos- sible since there always is some amount of data redundancy or there may be a predictable flow to the data. These characteristics of a set of data or a stream of data allow the use of a sort of mathematical algorithm to represent or describe the original data in fewer bits. A matching decompression process reverses the compression process and restores the data to its original form, or an approximation thereof. Compression serves to improve the efficiency of data transmission and storage, and is especially valuable if bandwidth and memory resources are limited. Data compression techniques can include the following: • Formatting: A technique that removes formatting from a commonly used form prior to transmission or storage.The receiving device reformats the data, placing the various fields of data in the appropriate places on the form, which it maintains in primary memory. • Redundant data: Also known as string coding. A technique that identifies and deletes redundant data prior to transmission or storage. See also run-length encoding. • Commonly used characters: A technique that involves the identification and abbreviation of commonly used characters, similar to the technique used by Samuel Morse in the development of Morse code. See also Huffman coding and Morse code. • Commonly used strings of characters: A technique that relies on the probability of character occurrence following a specific character. For example, the letter q generally is followed by the letter u. See also Markov source. 74570c03.qxd 9/11/07 12:19 PM Page 108 |
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