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    • 42. 发明授权
    • Data compression apparatus, method and system
    • 数据压缩装置,方法和系统
    • US5907638A
    • 1999-05-25
    • US969065
    • 1997-11-12
    • Ken Onodera
    • Ken Onodera
    • H03M7/40G06K9/36G06K9/46
    • H03M7/4031H03M7/3084
    • Conventionally, when compressing data, since data (words) are sequentially retrieved from the head of a dictionary, a large amount of time is required for compression processing. Particularly when compression/expansion processing is performed a plurality of times, a large amount of processing time is required. In order to solve such problems, input data is dealt with as a set of words having a specific number of bytes, and a word retrieval table having a size equal to or larger than the size of a dictionary for registering words is provided. By storing the position of each word registered in the dictionary in the word retrieval table, it is unnecessary to sequentially retrieve data (a word) from the head of the dictionary, so that compression/expansion processing can be promptly performed.
    • 通常,当压缩数据时,由于从字典的头部顺序地取回数据(字),所以压缩处理需要大量的时间。 特别是进行多次压缩/扩展处理时,需要大量的处理时间。 为了解决这些问题,输入数据被作为具有特定字节数的一组单词来处理,并且提供了具有等于或大于用于登记单词的字典大小的大小的单词检索表。 通过将字典中注册的每个单词的位置存储在词检索表中,不需要从字典的头部顺序地检索数据(一个字),从而可以迅速地执行压缩/扩展处理。