DEVICE AND METHOD FOR PARTIAL EXPANSION

摘要

PURPOSE: To enable partial expansion at high speed by reading partial data including a part of necessary compressed data and expanding compressed data. CONSTITUTION: An expansion area specifying means 11 specifies through calculation from which position of a restart marker code (RST) among compressed data to which position of an RST the partial expansion should be executed to specify an expansion area based on an area specifying parameter inputted from an input means 8 and the table of an RST stored in a data buffer 10. A reading area specifying means 12 specifies a sector block including the specified expansion area as a reading out area. Reproducing means 2 reads out the sector block being this reading area from a recording medium 1 and allows an expansion buffer 3 to store data of expansion area. An expansion means 4 expands data in expansion area stored in the extension buffer 3.