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    • 3. 发明授权
    • Two stage accumulator for use in updating coefficients
    • 用于更新系数的两级累加器
    • US5307375A
    • 1994-04-26
    • US973430
    • 1992-11-19
    • Allen WuWoo H. Paik
    • Allen WuWoo H. Paik
    • H03H15/00G06F7/50G06F7/509G06F7/62H03H17/00H03H21/00H04B3/06H03K5/159
    • G06F7/5095G06F7/62
    • A two stage accumulator is provided for updating coefficients. The accumulator is particularly useful in an adaptive equalizer. A first stage of the accumulator receives an error word and outputs sign and carry bits resulting from the addition of the error word and an N-bit LSB portion of a larger M-bit coefficient. A second stage is responsive to the sign and carry bits for updating the (M-N) MSB's of the M-bit coefficient. New error words are cyclically provided to the first stage during successive coefficient update cycles. The first stage can be implemented using an N-bit twos complement adder. The second stage can be implemented using an up/down counter. A leakage function is provided by causing the up/down counter to periodically skip over increment and decrement cycles.
    • 提供两级累加器用于更新系数。 累加器在自适应均衡器中特别有用。 累加器的第一级接收错误字,并输出符号并携带由误差字的相加和较大M位系数的N位LSB部分产生的位。 第二级响应于符号并携带用于更新M位系数的(M-N)个MSB的位。 在连续系数更新周期期间,新的错误字被循环地提供给第一级。 第一级可以使用N位二进制补码加法器来实现。 第二阶段可以使用向上/向下计数器来实现。 通过使上/下计数器周期性地跳过增量和递减周期来提供泄漏功能。
    • 7. 发明授权
    • Timing shell generation through netlist reduction
    • 通过网表减少定时shell生成
    • US5644498A
    • 1997-07-01
    • US377844
    • 1995-01-25
    • Christian JolyFrancois DucaroirZarir SarkariAllen Wu
    • Christian JolyFrancois DucaroirZarir SarkariAllen Wu
    • H01L21/82G06F17/50G06F15/00
    • G06F17/5031
    • Gate level netlists used for timing analysis in integrated circuit design are reduced using a timing shell generator while preserving critical information for timing analysis. After verification of timings, the gate level netlist is convened into a shell containing block boundary information. The function of the shell generator is to delete internal cells meeting a set of criteria. The result is a shell netlist containing a subset of the original netlist. Thus, the design cycle time involved and computing time and resources needed in ASIC development for chips using circuits represented by timing shell netlists are decreased by substituting design verification at the top level of large hierarchical netlists or large flat netlists by bottom up verification procedures using timing shells.
    • 集成电路设计中用于定时分析的门级网表使用定时外壳生成器减少,同时保留了时序分析的关键信息。 在验证定时之后,门级网表被调入包含块边界信息的外壳。 shell生成器的功能是删除符合一组条件的内部单元格。 结果是包含原始网表的子集的shell网表。 因此,使用由时序壳网表表示的电路的芯片的ASIC开发所需的设计周期时间和计算时间和资源通过使用定时从底层向上验证程序替代大型分层网表或大型平面网表的顶层的设计验证而减少 贝壳。
    • 8. 发明授权
    • Adaptive compression of digital video data using different modes such as
PCM and DPCM
    • 使用不同模式(如PCM和DPCM)对数字视频数据进行自适应压缩
    • US5376968A
    • 1994-12-27
    • US23251
    • 1993-03-11
    • Allen WuEdward A. KrauseWoo H. Paik
    • Allen WuEdward A. KrauseWoo H. Paik
    • H04N7/30G06T9/00H03M7/30H04N7/26H04N7/32H04N7/36H04N7/50H04N7/137
    • H04N19/90H04N19/12H04N19/186H04N19/503H04N19/51H04N19/517H04N19/61
    • Digital video signals are adaptively compressed for communication to a receiver. Superblocks, each containing a plurality of blocks of digital video data, are compressed using PCM, DPCM with a general motion vector for the entire superblock, and DPCM with a specific motion vector for each block contained within a superblock. The result of each compression mode is compared after accounting for overhead data, to determine which results in the least amount of data for each block. These blocks are assembled into a superblock, and compared together with necessary overhead and motion vector data to the same superblock processed using all PCM as well as the superblock processed using all DPCM. The comparison determines which compression mode produces the least amount of data for the superblock. The most compact superblock is selected for transmission. The transmitted superblocks are decoded by a decoder that recovers the necessary motion vectors and overhead information which identifies the type of compression used to provide the superblock.
    • 数字视频信号被自适应地压缩以用于与接收机的通信。 使用具有用于整个超块的通用运动矢量的PCM,DPCM以及包含在超级块内的每个块的特定运动矢量的DPCM对每个包含多个数字视频数据块的超块进行压缩。 在计算开销数据后,对每个压缩模式的结果进行比较,以确定每个块的数据量最少的结果。 这些块被组装成超级块,并且与必要的开销和运动矢量数据一起与使用所有PCM处理的相同的超级块以及使用所有DPCM处理的超级块进行比较。 该比较确定哪个压缩模式为超级块产生最少量的数据。 选择最紧凑的超级块进行传输。 发送的超块被解码器解码,该解码器恢复必要的运动矢量和标识用于提供超级块的压缩类型的开销信息。