公开(公告)号：US4447138A

公开(公告)日：1984-05-08

申请号：US357341

申请日：1982-03-11

申请人： Takahiro Sugiyama ,  Yukio Hagiwara

发明人： Takahiro Sugiyama ,  Yukio Hagiwara

IPC分类号： G02B9/34 ,  G02B13/00 ,  G02B13/24 ,  G11B7/135 ,  G11B7/1372 ,  G11B7/1374

CPC分类号： G02B13/24 ,  G02B9/34 ,  G11B7/1374 ,  G11B2007/13727

摘要： An objective system for a video disc comprising four lenses grouped into four lens components. The first lens component is a positive meniscus lens, the second lens component is a positive meniscus lens, the third lens component is a positive meniscus lens having a relatively long focal length or a negative meniscus lens, and the fourth lens component is a positive meniscus lens. The objective system satisfies the following conditions:(1) 1.7F>F.sub.1,2 >1.4F(2) 1.35>F.sub.1 /F.sub.2 >0.75(3) 1.0>F.sub.1,2 /F.sub.1,2,3 >0.8(4) 1.1F>d.sub.5 >0.4F(5) d.sub.6 >0.5F(6) N.sub.4 >1.7where F is the resultant focal length of the objective lens assembly, F.sub.1 is the focal length of the first lens component, F.sub.2 is the focal length of the second lens component, F.sub.1,2 is the resultant focal length of the first and second lens components, F.sub.1,2,3 is the resultant focal length of the first, second and third lens components, r.sub.i is the radius of curvature of the i-th surface, d.sub.i is the lens thickness or air gap of the i-th lens surface and the adjacent lens surface, and N.sub.i is the refractive index of the i-th lens.

摘要翻译： 一种用于视盘的物镜系统，包括分为四个透镜部件的四个透镜。 第一透镜部件是正弯月透镜，第二透镜部件是正弯月透镜，第三透镜​​部件是具有较长焦距的正弯月透镜或负弯月形透镜，第四透镜部件为正弯月面 镜片。 目标系统满足以下条件：（1）1.7F> F1,2> 1.4F（2）1.35> F1 / F2> 0.75（3）1.0> F1,2 / F1,2,3> 0.8（4）1.1 F> d5> 0.4F（5）d6> 0.5F（6）N4> 1.7其中F是物镜组件的合成焦距，F1是第一透镜组件的焦距，F2是 第二透镜部件F1,2是第一和第二透镜部件的合成焦距，F1,2,3是第一，第二和第三透镜部件的合成焦距，ri是第i个透镜部件的曲率半径， di表示第i个透镜表面和相邻透镜表面的透镜厚度或气隙，Ni是第i个透镜的折射率。

公开(公告)号：US4658420A

公开(公告)日：1987-04-14

申请号：US676531

申请日：1984-11-30

申请人： Yuzo Fukushi ,  Yukio Hagiwara

发明人： Yuzo Fukushi ,  Yukio Hagiwara

IPC分类号： H04Q1/448 ,  H04B3/20 ,  H04B3/23 ,  H04L27/00

CPC分类号： H04B3/23

摘要： A tone disabler is designed for use in a full duplex data transmission system adapted to send a tone before each transmission of data and to reverse the phase of such tone during a later half of a full duplex data transmission. Both the tone and the phase reversal are detected. Responsive to a coincidence of such detections, a control signal is given to disable an echo canceller. The control signal is fed back to latch the control signal as long as the tone is present.

摘要翻译： 音调释放器设计用于全双工数据传输系统，适用于在每次数据传输之前发送音调，并在全双工数据传输的后半部分期间反转这种音调的相位。 检测到色调和相位反转。 响应于这种检测的巧合，给出控制信号以禁用回波消除器。 只要音调存在，控制信号被反馈以锁存控制信号。

公开(公告)号：US4389100A

公开(公告)日：1983-06-21

申请号：US358778

申请日：1982-03-17

申请人： Takahiro Sugiyama ,  Yukio Hagiwara

发明人： Takahiro Sugiyama ,  Yukio Hagiwara

IPC分类号： G02B9/12 ,  G02B13/00 ,  G02B13/24 ,  G02B21/02

CPC分类号： G02B9/12 ,  G02B13/24

摘要： An objective system consists of three lens components, the first lens component including a positive meniscus lens convex to the light source, the second lens component including a positive meniscus lens convex to the light source, and the third lens component including a positive meniscus lens concave to the light source. The objective system for a video disc satisfying the following conditions:F/0.55 F/0.15 (3)F

摘要翻译： 目标系统由三个透镜部件组成，第一透镜部件包括对光源凸起的正弯月形透镜，第二透镜部件包括对光源凸起的正弯月形透镜，第三透镜​​部件包括正弯月透镜凹部 到光源。 满足以下条件的视频盘的目标系统：F / 0.55 F / 0.15（3）F <| r5| < 3F，r5 <0（4）d2 <0.2F（5）d4 <0.3F（6）其中F是整个透镜系统的合成焦距，Fi是第i个透镜部件的焦距，ri是 第i个表面的曲率半径，di是第i个透镜的厚度或气隙，Ni是第i个透镜的折射率。

公开(公告)号：US4852161A

公开(公告)日：1989-07-25

申请号：US58680

申请日：1987-06-04

申请人： Yukio Hagiwara

发明人： Yukio Hagiwara

IPC分类号： H04B3/23

CPC分类号： H04B3/234

摘要： In an echo canceller system of the type comprising a circuit for measuring the characteristic of an echo path in accordance with input/output signals of the echo path and cancelling from an actual echo signal an approximate echo path signal synthesized in accordance with the echo characteristic, a level measuring circuit for measuring the level of the residual signal, a residual echo level estimating means for estimating the residual echo level based on the output of the level measuring circuit, and a comparator comparing the output of the residual echo level estimating means with the output of the residual echo level measuring circuit, the output of the comparator controlling the measuring operation of the echo path, there are provided a residual signal level measuring circuit including the residual signal level measuring circuit, a transmitted signal input level measuring circuit, and a detector for detecting an opened state of the echo path and producing an output which controls the residual signal level measuring unit.

摘要翻译： 在包括用于根据回波路径的输入/输出信号测量回波路径的特性的电路的类型的回波消除器系统中，并且从实际回波信号中取消根据回波特性合成的近似回波路径信号， 用于测量残余信号电平的电平测量电路，用于基于电平测量电路的输出来估计残余回波电平的残余回波电平估计装置，以及将残余回波电平估计装置的输出与 剩余回波电平测量电路的输出，控制回波路径的测量操作的比较器的输出，提供一个残余信号电平测量电路，包括残余信号电平测量电路，发射信号输入电平测量电路和 检测器，用于检测回波路径的打开状态并产生控制该回波路径的输出 残留信号电平测量单元。