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    • 2. 发明授权
    • Splitter
    • 分流器
    • US09100105B2
    • 2015-08-04
    • US14237591
    • 2012-08-10
    • Yasuko YamamotoMitsuru TanabeMitsuru MaedaKenji Kuniyoshi
    • Yasuko YamamotoMitsuru TanabeMitsuru MaedaKenji Kuniyoshi
    • H04B3/00H04L25/00H04B3/56H04B3/54
    • H04B3/56H04B3/54H04B2203/5425H04B2203/5483H04B2203/5491
    • A splitter includes, in parallel between trunk terminals and branch terminals, a signal branching circuit that blocks distributed power and passes a PLC communication signal and a power branching circuit that blocks the communication signal and passes the distributed power. In the signal branching circuit, impedance viewed from the branch terminal side is matched with characteristic impedance of a power line and impedance viewed from the trunk terminal side is higher than impedance viewed from the branch terminal side, in the frequency band of the communication signal. In the power branching circuit, input/output impedance is set to be sufficiently higher than the impedance of the signal branching circuit viewed from the trunk terminal side, in the frequency band of the communication signal.
    • 分路器在中继线端子和分支端子之间并联包括阻塞分布式电力并通过PLC通信信号的信号分支电路和阻塞通信信号并通过分布式电力的功率分支电路。 在信号分支电路中,在通信信号的频带中,从分支端子侧观察的阻抗与电力线的特性阻抗匹配,并且从主体侧端子侧观察的阻抗高于从分支端子侧观察到的阻抗。 在功率分支电路中,在通信信号的频带中,输入/输出阻抗被设定为足够高于从主体端子侧观察的信号分支电路的阻抗。
    • 8. 发明授权
    • Moving image coding apparatus, moving image decoding apparatus, control method therefor, and computer-readable storage medium
    • 运动图像编码装置,运动图像解码装置,其控制方法和计算机可读存储介质
    • US07957604B2
    • 2011-06-07
    • US10585857
    • 2005-03-11
    • Masaki SuzukiMitsuru Maeda
    • Masaki SuzukiMitsuru Maeda
    • G06K9/36G06K9/46H04B1/66H04N11/02H04N11/04H04N7/12
    • H04N19/63
    • In this invention, even if final code data is to be generated by selectively discarding code data for each bitplane, errors due to bitplane rounding down operation can be suppressed from being gradually accumulated in predicted data such as P- and B-pictures, thereby preventing a deterioration in image quality. For this purpose, a block segmentation unit (31) segments an input frame into a plurality of blocks, and supplies the respective blocks to a difference computing unit (32). The difference computing unit (32) outputs the blocks to a DWT unit (33) without any change when the intra-frame coding mode is set. When the inter-frame coding mode is set, the difference computing unit (32) outputs the result obtained by computing a difference from predicted data from a motion compensation unit (42) to the DWT unit (33). The frequency component data obtained by the DWT unit (33) and a quantization unit (34) is entropy-coded by an entropy coding unit (35), and a bitplane formed by bit information at the bit position of each component value is coded. A bitplane round-down unit (36) rounds down the code data of bitplanes from the least significant position to an upper bit position such that the resultant code amount becomes equal to or less than a target code amount. A code forming unit then generates code data. Only when the intra-frame coding mode is set, a dequantization unit (39) and inverse DWT unit (40) are executed to update a frame memory (41).
    • 在本发明中,即使通过选择性地丢弃每个位平面的代码数据来生成最终代码数据,也可以抑制由于位平面舍入运算引起的错误,从而在诸如P图像和B-图像的预测数据中逐渐累积,从而防止 图像质量下降。 为此,块分割单元(31)将输入帧分割为多个块,并将各个块提供给差分计算单元(32)。 当设置帧内编码模式时,差分计算单元(32)将块输出到DWT单元(33)而没有任何改变。 当帧间编码模式被设置时,差分计算单元(32)将从运动补偿单元(42)的预测数据计算得到的结果输出到DWT单元(33)。 由DWT单元(33)和量化单元(34)获得的频率分量数据由熵编码单元(35)进行熵编码,并且对每个分量值的位位置处的位信息形成的位平面进行编码。 位平面舍入单元(36)将位平面的代码数据从最低有效位置向下舍入,使得所得到的代码量变得等于或小于目标代码量。 代码形成单元然后生成代码数据。 仅当帧内编码模式被设置时,执行去量化单元(39)和逆DWT单元(40)来更新帧存储器(41)。