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1. 发明授权

US4612532A Data compression apparatus and method 失效
标题翻译：数据压缩装置及方法
公开(公告)号：US4612532A
公开(公告)日：1986-09-16
申请号：US622547
申请日：1984-06-19
申请人： Francis L. Bacon , Donald J. Houde
发明人： Francis L. Bacon , Donald J. Houde
IPC分类号： H03M7/46 , H03M7/42 , H03M7/44 , H03M7/00
CPC分类号： H03M7/42
摘要： A preferred embodiment of the invention provides a system for the dynamic encoding of a stream of characters. In a preferred embodiment, the system includes an input for receiving a stream of characters, and an output for providing encoded data. The system also includes a provision for storing, accessing, and updating a table (what I call a "followset" table) for each of a plurality of characters, listing candidates for the character which may follow, in the stream, the character with which the table is associated. The system also includes a provision for furnishing at the output, for a given character in the stream at the input, a signal indicative of the position, occupied by the given character, in the followset character which immediately precedes the given character in the stream of the input. A preferred embodiment of the invention also provides a system for decoding the encoded data, wherein the decoder utilizes a followset table.
摘要翻译：本发明的优选实施例提供了一种用于字符流的动态编码的系统。在优选实施例中，系统包括用于接收字符流的输入端和用于提供编码数据的输出。该系统还包括用于存储，访问和更新表（对于多个字符中的每一个）的表（我称之为“后续”表）的规定，列出流中可能遵循的字符的候选，该表已关联。该系统还包括用于在输出处为输入中的流中的给定字符提供表示给定字符占据的位置的信号的规定，该信号紧跟在给定字符流中的给定字符之前的后续字符中输入。本发明的优选实施例还提供了一种用于对编码数据进行解码的系统，其中该解码器利用一个后续表。

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