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    • 2. 发明授权
    • Synchronization circuit for a Viterbi decoder
    • 维特比解码器同步电路
    • US4527279A
    • 1985-07-02
    • US511774
    • 1983-07-06
    • Yutaka YasudaYasuo HirataShuji MurakamiKatsuhiro NakamuraYukitsuna Furuya
    • Yutaka YasudaYasuo HirataShuji MurakamiKatsuhiro NakamuraYukitsuna Furuya
    • H03M13/33H04L7/04
    • H03M13/33
    • A Viterbi decoder synchronization circuit comprises a circuit that derives a word synchronization signal from a received bit stream of convolutional codes. A first detector detects a maximum of metric values derived from the Viterbi decoder at different locations in time. A memory is provided for storing therein the address codes derived at different times and the maximum metric values detected by the first detector. A second detector is connected to the memory for detecting the presence of a path between the states addressed by the address codes stored in the memory. An integrator is connected to the second detector to integrate its output signal. To the integrator is connected a third detector which detects when the integrator output reaches a value indicative of one of word-in-sync and word-out-of-sync conditions of the Viterbi decoder. A phase shift signal is generated in response to an output signal from the third detector and applied to a phase shifter to introduce a delay time to the bit stream.
    • 维特比解码器同步电路包括从接收到的卷积码的比特流导出字同步信号的电路。 第一检测器在不同的时间点检测从维特比解码器导出的度量值的最大值。 提供存储器,用于在其中存储在不同时间导出的地址码和由第一检测器检测的最大度量值。 第二检测器连接到存储器,用于检测由存储在存储器中的地址码寻址的状态之间的路径的存在。 积分器连接到第二检测器以整合其输出信号。 连接到积分器的第三检测器,其检测积分器输出何时达到表示维特比解码器的同步字和同步字的其中一个的值。 响应于来自第三检测器的输出信号产生相移信号,并将其应用于移相器以向该比特流引入延迟时间。
    • 3. 发明授权
    • Maximum likelihood error correcting technique
    • 最大似然误差校正技术
    • US4462101A
    • 1984-07-24
    • US355200
    • 1982-03-05
    • Yutaka YasudaYasuo HirataAkira Ogawa
    • Yutaka YasudaYasuo HirataAkira Ogawa
    • G06F11/10H03M13/23H04L1/00
    • H04L1/0059H04L1/0054H04L1/0069
    • A maximum likelihood error correcting technique for a digital communication in which a transmit side provides coded data with some redundancy through a convolutional coding circuit, and a receive side corrects transmission errors automatically through a maximum likelihood error correcting circuit has been improved by deleting some symbols at a transmit side to increase a coding rate close to 1, and inserting dummy symbols at a receive side into each bit position where a symbol has been deleted at a transmit side. A likelihood value for that dummy symbol inserted at a receive side for the maximum likelihood decoding is a fixed predetermined value. Thus, both a coding circuit in a transmit side and a decoding circuit in a receiving circuit have only to handle original low rate code, while keeping a coding rate in a transmission line high. Then, the codec for high rate code obtained merely by adding the simple circuits to the simple codec for low rate code provides an excellent error correcting capability compared with other conventional error correcting techniques of the same coding rate.
    • 一种用于数字通信的最大似然纠错技术,其中发送侧通过卷积编码电路提供具有一定冗余度的编码数据,并且接收端通过最大似然误差校正电路自动校正传输错误已经通过删除一些符号在 发送侧,以将编码率提高到接近1,并将接收侧的虚拟符号插入发送侧的符号被删除的每个比特位置。 在接收侧插入用于最大似然解码的伪符号的似然值是固定的预定值。 因此,发送侧的编码电路和接收电路中的解码电路都只能处理原始低速率码,同时保持传输线路中的编码率高。 然后,与其他相同编码率的常规纠错技术相比,仅通过将简单电路添加到用于低速率代码的简单编解码器而获得的高速率代码的编解码器提供了出色的纠错能力。
    • 4. 发明授权
    • Endoscope with alternating irradiate light
    • 内镜与交替照射光
    • US08400500B2
    • 2013-03-19
    • US11559197
    • 2006-11-13
    • Yasuo Hirata
    • Yasuo Hirata
    • A61B1/04A61B1/06
    • A61B1/0607A61B1/0676A61B1/0684A61B1/128G02B23/2423G02B23/2461G02B23/2484
    • An endoscope that has an insertion portion that is inserted into an interior of an object and an image pickup device that is provided in the insertion portion, and that observes the interior of the object via the image pickup device, includes: a first LED unit that is provided in the insertion portion and has an LED chip that is used to irradiate light into the interior of the object; a second LED unit that is provided in the insertion portion and has an LED chip that is used to irradiate light into the interior of the object; and an alternating conduction control unit that conducts power alternatingly to the first LED unit and the second LED unit.
    • 具有插入到物体内部的插入部和设置在插入部中并且经由图像拾取装置观察物体内部的图像拾取装置的内窥镜包括:第一LED单元,其包括: 设置在插入部分中,并且具有用于将光照射到物体内部的LED芯片; 第二LED单元,其设置在所述插入部中,并且具有用于将光照射到所述物体的内部的LED芯片; 以及交替导通控制单元,其交替地对第一LED单元和第二LED单元进行供电。
    • 6. 发明申请
    • COOLING APPARATUS FOR ENDOSCOPE AND ENDOSCOPE SYSTEM
    • 内窥镜和内窥镜系统的冷却装置
    • US20080242927A1
    • 2008-10-02
    • US12048292
    • 2008-03-14
    • Yasuo Hirata
    • Yasuo Hirata
    • A61B1/12
    • G02B23/2492
    • The endoscope cooling device is to cool an insertion portion having an observation portion at the distal end. The device is provided with an inner sheath into which the distal end portion of the insertion portion including the observation portion is inserted to form a first flow path of a cooling fluid between the outer circumferential face of the insertion portion and the inner circumferential face of the inner sheath, an outer sheath into which the inner sheath is inserted to form a second flow path of the cooling fluid between the outer circumferential face of the inner sheath and the inner circumferential face of the outer sheath, a regulating means for regulating the distal end portion in moving at least either through the inner sheath or the outer sheath, and a fluid supply means for supplying the cooling fluid to the first flow path and the second flow path.
    • 内窥镜冷却装置是在远端冷却具有观察部的插入部。 该装置设置有内护套,插入部的前端部插入观察部的前端部,插入部的外周面与插入部的内周面之间形成冷却流体的第一流路 内护套,外护套,内护套插入其中以在内护套的外周面和外护套的内周面之间形成冷却流体的第二流路;调节装置,用于调节远端 至少通过内护套或外护套移动的部分,以及用于将冷却流体供应到第一流路和第二流路的流体供给装置。
    • 8. 发明授权
    • Endoscope of which the bending part is operated by fluid supply or exhaustion
    • 弯曲部分通过流体供应或排气操作的内窥镜
    • US06951537B2
    • 2005-10-04
    • US10746492
    • 2003-12-23
    • Yasuo Hirata
    • Yasuo Hirata
    • A61B1/005A61B1/00
    • A61B1/0055
    • An endoscope whose bending section is moved with supply or discharge of fluid comprises: a fluid-pressure actuator that is included as a bending section in an insertion unit and has fluid chambers associated with a plurality of bending directions; and fluid supply tubes over which fluid is supplied from a fluid pressure source to the respective fluid chambers of the fluid-pressure actuator or fluid supplied to the respective fluid chambers is discharged. The fluid-pressure actuator comprises: a soft multi-lumen tube that has a center through hole and a plurality of penetrating holes which surrounds the center through hole and which realizes the fluid chambers; an internal tubular member that is inserted in the center through hole; and an external tubular member that is put on the periphery of the multi-lumen tube with a gap, which allows each fluid chamber to axially stretch and radially slightly expand during supply of fluid to the fluid chamber and thus eases bending, created between them.
    • 一种内窥镜,其弯曲部通过流体供给或排出而移动,包括:作为弯曲部包含在插入单元中并具有与多个弯曲方向相关联的流体室的流体压力致动器; 并且流体从流体压力源供应到流体压力致动器的相应流体室或供应到各个流体室的流体的流体供应管被排出。 流体压力致动器包括:具有中心通孔的软多腔管和围绕中心通孔并且实现流体室的多个穿透孔; 插入中心通孔的内部管状构件; 以及外部管状构件,其被放置在具有间隙的多腔管的周边上,这允许每个流体室在向流体室供应流体期间轴向地拉伸并且径向地略微膨胀,并且因此在它们之间产生弯曲。