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51. 发明授权

US5929793A High speed variable length code detection using a cascaded structure 失效
标题翻译：使用级联结构的高速可变长度代码检测
公开(公告)号：US5929793A
公开(公告)日：1999-07-27
申请号：US815943
申请日：1997-03-13
申请人： Byeong Ho Choi
发明人： Byeong Ho Choi
IPC分类号： H04N7/24 , H03M7/40
CPC分类号： H03M7/6005 , H03M7/4081 , H03M7/6029 , H04N19/436 , H04N19/44 , H04N19/13 , H04N19/91
摘要： A high speed code word detecting apparatus and method using a cascade structure detects and separates a variable length code from packed data at high speed in accordance with a code word characteristic. The apparatus includes a code length determining unit for determining a plurality of code length values in accordance with a code starting point determination mask for a number corresponding to a maximum code length value when a packet stream is applied, and a code word selecting unit for generating respective code word starting points based upon remaining bits of a code word separated during a just previous clock cycle, and separating a plurality of code words from the plurality of determined code length values during one clock cycle using a cascade structure. The method includes a first step for sequentially determining a plurality of code length values in accordance with a code starting point determination mask for a number corresponding to a maximum code length value when a packet stream is applied, and a second step for generating respective code word starting points based upon remaining bits of a code word separated during a just previous clock cycle, and separating a plurality of code words from the plurality of determined code length values during one clock cycle.
摘要翻译：使用级联结构的高速码字检测装置和方法根据码字特性高速检测和分离可变长度码与压缩数据。该装置包括：代码长度确定单元，用于根据应用分组流时与最大代码长度值对应的数字的代码起始点确定掩码来确定多个代码长度值;以及代码字选择单元，用于生成基于在刚刚的时钟周期期间分离的码字的剩余位，并且在使用级联结构的一个时钟周期期间从多个确定的码长度值分离多个码字的相应码字起始点。该方法包括：第一步骤，用于当应用分组流时，根据与最大代码长度值对应的数字的代码起始点确定掩码顺次确定多个代码长度值;以及第二步骤，用于产生相应代码字基于在刚刚的时钟周期期间分离的码字的剩余位，以及在一个时钟周期内从多个确定的码长度值中分离多个码字的起始点。

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