Adaptive variable length coding apparatus, adaptive variable length coding method and the adaptive variable length coding program

摘要

PROBLEM TO BE SOLVED: To provide an adaptive variable length encoder in which the memory capacity of a counter for storing occurrence frequency can be reduced, and to provide an adaptive variable length encoding method and an adaptive variable length encoding program.;SOLUTION: The adaptive variable length encoder comprises a data storage meas 2 for storing input data, an encoding table 4 representing the relation of the input data and encoded data, a means 3 for encoding the input data with reference to the encoding table, a means 5 for dividing the input data into some groups, a means 6 for operating the occurrence frequency of each group of input data, and a means 7 for updating the encoding table based on the occurrence frequency of group data.;COPYRIGHT: (C)2005,JPO&NCIPI