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1. 发明授权

US06255987B1 Block adaptive quantization 有权
标题翻译：块自适应量化
公开(公告)号：US06255987B1
公开(公告)日：2001-07-03
申请号：US09420397
申请日：1999-10-18
申请人： David C Lancashire , Bartholomew A. F. Barnes , Stephen J Udall
发明人： David C Lancashire , Bartholomew A. F. Barnes , Stephen J Udall
IPC分类号： G01S1390
CPC分类号： H04N19/98
摘要： A block adaptive quantization device processes blocks of input data samples to determine an aggregate or average value which is applied to each of a number of exponent look-up tables to derive an exponent value dependent on the extent of compression required. The exponent value is split by an exponent splitter into a remainder value and a shift value. The remainder value is used to select one of a number of divide look-up tables to which the unsigned data sample is applied, and the shift value is used to apply a variable bit shift to the data sample. Each divide look-up table comprises the same group of divide look-up tables. The combination of the four look-up tables in the group, together with the variable bit shift defines a series of code tables made up of a group of divide look-up tables repeated at six dB intervals. The remainder value selects one of the code tables within the group, and the bit shift operation determines the selected one of the repeated groups. The code tables within the group are spaced logarithmically, as are the groups themselves. This arrangement considerably reduces the number of look-up tables required for a given processor, reducing the memory requirement and increasing speed.
摘要翻译：块自适应量化设备处理输入数据样本块以确定应用于多个指数查找表中的每一个的聚合值或平均值，以导出取决于所需压缩程度的指数值。指数值被指数分割器分解为余数值和移位值。剩余值用于选择应用无符号数据样本的多个划分查找表中的一个，并且使用移位值将可变位移应用于数据样本。每个划分查找表包括同一组划分查找表。组中的四个查找表的组合以及可变位移定义了由以6dB间隔重复的一组分割查找表组成的一系列代码表。剩余值选择组内的一个代码表，并且位移操作确定所选择的一个重复组。组内的代码表是对数间隔的，组本身也是这样。这种布置大大减少了给定处理器所需的查找表数量，从而减少了内存需求并提高了速度。

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