公开(公告)号：US5708560A

公开(公告)日：1998-01-13

申请号：US506095

申请日：1995-07-24

申请人： Rajendra Kumar ,  Steven E. Brooks

发明人： Rajendra Kumar ,  Steven E. Brooks

IPC分类号： G06F1/16 ,  E05D11/10 ,  H05K7/16

CPC分类号： G06F1/1632 ,  G06F1/1626 ,  Y10S248/918 ,  Y10T16/5409 ,  Y10T16/5472 ,  Y10T16/5474 ,  Y10T16/5478

摘要： A device (10) adding keyboard input to a handheld computer (12) lacking such input (such as pen computers and personal digital assistants) includes a bracket (30) having a plurality of clips (33) removably carrying the handheld computer (12), and a joint (40) secured to the keyboard (11) and the bracket (30) for positioning the keyboard (11) in a plurality of orientations relative to the handheld computer (12). These orientations include a first orientation in which the keyboard (11) is operable and at a preselected viewing angle from a display (14) that is pan of the handheld computer (12), a second orientation adjacent the display (14) in which the keyboard (11) substantially covers the display (14), and a third orientation proximate the handheld computer (12) in which the display (14) is unobstructed, thereby facilitating pen-based input through the display (14). A locking slide (51) carried in a recess (52) is selectively extended by the user to pass through a plurality of slots (53, 54 and 55) in joint (40) to secure the keyboard (11) and handheld computer (12) in the first and operational orientation.

摘要翻译： 将缺少这样的输入（例如笔式计算机和个人数字助理）的键盘输入添加到键盘输入的装置（10）包括具有可移除地携带手持计算机（12）的多个夹子（33）的托架（30） ，以及固定到键盘（11）和支架（30）的接头（40），用于将键盘（11）相对于手持式计算机（12）定位成多个取向。 这些方向包括第一方向，其中键盘11可操作并且以与手持式计算机（12）的平底锅的显示器（14）成预定的视角相邻的显示器（14）的第二定向，其中， 键盘（11）基本上覆盖显示器（14），以及靠近手持式计算机（12）的第三方向，其中显示器（14）不被阻挡，从而便于通过显示器（14）进行基于笔的输入。 携带在凹部（52）中的锁定滑块（51）由使用者选择性地延伸以穿过接头（40）中的多个狭槽（53,54和55），以固定键盘（11）和手持式计算机（12） ）在第一和操作方向。

公开(公告)号：US5632373A

公开(公告)日：1997-05-27

申请号：US415327

申请日：1995-04-03

申请人： Rajendra Kumar ,  Steven E. Brooks

发明人： Rajendra Kumar ,  Steven E. Brooks

IPC分类号： G06F1/16 ,  B65D43/24

CPC分类号： G06F1/1628

摘要： A protective case for housing a portable computer having a keyboard and a display, which protective case includes a keyboard case for receiving the keyboard and a display case for receiving the display. The display case is pivotally attached to the keyboard case and is movable between an open position and a closed position relative to the keyboard case. The axis of rotation of the display case relative to the keyboard case is coaxial with the axis of rotation of the display relative to the keyboard of the portable computer. An articulating handle is provided which attaches to both the keyboard case and the display case, and articulates about a pivot pin as the display case moves relative to the keyboard case. Additionally, the handle may be moved between an unlatched position whereby the display case pivots freely relative to the keyboard case, and a latched position whereby the display case is retained against movement relative to the keyboard case. In the unlatched position, the handle articulates about a pivot pin which is parallel to the axis of rotation of the portable computer. In the latched position, the pivot pin is substantially perpendicular to the axis of rotation of the portable computer thereby preventing movement of the display relative to the keyboard.

摘要翻译： 一种用于容纳具有键盘和显示器的便携式计算机的保护壳，该保护壳包括用于接收键盘的键盘盒和用于接收显示器的显示盒。 显示壳体可枢转地附接到键盘壳体并且可相对于键盘壳体在打开位置和关闭位置之间移动。 显示壳体相对于键盘壳体的旋转轴与显示器相对于便携式计算机的键盘的旋转轴线同轴。 提供了一种铰接手柄，其连接到键盘壳体和显示器壳体，并且当显示器壳体相对于键盘壳体移动时围绕枢轴销铰接。 此外，手柄可以在解锁位置之间移动，由此显示器壳体相对于键盘壳体自由地枢转，并且锁定位置使得显示器壳体相对于键盘壳体保持不动。 在解锁位置，手柄围绕平行于便携式计算机的旋转轴线的枢轴销铰接。 在锁定位置，枢转销基本上垂直于便携式计算机的旋转轴线，从而防止显示器相对于键盘的移动。

公开(公告)号：US5484989A

公开(公告)日：1996-01-16

申请号：US146713

申请日：1993-11-01

申请人： Rajendra Kumar ,  Steven E. Brooks ,  Michael J. Gallo

发明人： Rajendra Kumar ,  Steven E. Brooks ,  Michael J. Gallo

IPC分类号： G06F15/02 ,  G06K7/00

CPC分类号： G06K13/0875 ,  G06F15/0216 ,  G06K13/0893 ,  G06K7/0021 ,  G06K7/006 ,  G06K7/0091 ,  Y10S277/906

摘要： An electronic terminal of the type employing a card reading device mounted within the interior thereof accessible through an input port formed in a wall of the terminal. A shield formed of an elastomeric material is mounted adjacent the input port of the card reader to prevent the entrance of debris into the interior of the terminal. The shield provides at least two opposing movable overlapping flaps extending over the card reader input port. The flaps are readily flexible to allow a card to slide therebetween, and automatically flex back to an overlapping closed position when the card is withdrawn. Locator pins and mating holes are provided in said flaps to assure a consistent return to the closed and sealed position. In one embodiment, the shield is made from two half sections which may be either separated or connected via a flexible bridge. In another embodiment, end inserts are provided between said half sections which may also be separate members or attached to said half sections via corresponding flexible bridges.

摘要翻译： 一种使用安装在其内部的读卡装置的电子终端，可通过形成在终端的墙壁中的输入端口进入。 由弹性体材料形成的屏蔽件邻近读卡器的输入端口安装，以防止碎屑进入端子的内部。 屏蔽件提供延伸在读卡器输入端口上的至少两个相对的可移动的重叠翼片。 襟翼容易灵活，以允许卡在其间滑动，并且当卡被拉出时自动地弹回到重叠的关闭位置。 定位销和配合孔设置在所述翼片中，以确保一致地返回到封闭和密封位置。 在一个实施例中，屏蔽由两个半部分制成，两个半部分可以通过柔性桥分开或连接。 在另一个实施例中，端部插入件设置在所述半部分之间，所述半部分也可以是分离的部件，或者通过相应的柔性桥连接到所述半部分。

公开(公告)号：US5548478A

公开(公告)日：1996-08-20

申请号：US280092

申请日：1994-07-25

申请人： Rajendra Kumar ,  Steven E. Brooks

发明人： Rajendra Kumar ,  Steven E. Brooks

IPC分类号： G06F1/16 ,  E05D11/00 ,  H05K7/16

CPC分类号： G06F1/1679 ,  G06F1/162 ,  G06F1/1624 ,  G06F1/1681 ,  G06F1/1683 ,  Y10T16/522

摘要： A laptop style computing device (10) includes a base portion (11), a display portion (12) containing a display screen (16) and a touch input panel (18) and a mechanism (45, 55) for selectively positioning the display portion in selective angular engagement with the base portion in a plurality of angular upright positions for use in the laptop mode, as well as the display up position for slate style use and the display down position for closing the device.

摘要翻译： 膝上型计算装置（10）包括基部（11），包含显示屏（16）和触摸输入面板（18）的显示部分（12）和用于选择性地定位显示器的机构（45,55） 在笔记本电脑模式下用于多个角度直立位置的与基部部分选择性角度接合的部分，以及用于平板式使用的显示上升位置和用于关闭装置的显示向下位置。

公开(公告)号：US09071494B2

公开(公告)日：2015-06-30

申请号：US13486608

申请日：2012-06-01

申请人： Rajendra Kumar

发明人： Rajendra Kumar

IPC分类号： H04L27/00 ,  H04L27/26 ,  H04L27/20 ,  H03H21/00

CPC分类号： H04L27/2657 ,  H03H21/003 ,  H04L27/20 ,  H04L27/2676 ,  H04L27/2688

摘要： Systems and methods are provided for fast and precise estimation of frequency with relatively minimal sampling and relatively high tolerance to noise.

公开(公告)号：US08995542B2

公开(公告)日：2015-03-31

申请号：US13913761

申请日：2013-06-10

申请人： Rajendra Kumar

发明人： Rajendra Kumar

IPC分类号： H04K1/10 ,  H04L27/28 ,  H04L27/26

CPC分类号： H04L27/2602 ,  H04L27/2614 ,  H04L27/2615 ,  H04L27/2618

摘要： Various embodiments of the invention are directed to methods and systems for multi transform OFDM transmitter and receivers with low peak to average power ratio (PAPR) signals, that have high bandwidth efficiency and are computational efficient. For example, various embodiments of the transmitter may utilize an architecture comprised of a baseband modulator, a serial to parallel converter, a bank of multiplicity NT orthonormal transforms unit, a bank of multiplicity NT inverse Fourier transforms unit, a dummy symbols generator, and a minimum PAPR evaluation unit for finding the optimum transform index n0. Various embodiments of the receiver may comprise of a transform index detection unit for the detection of the transform index imbedded in the OFDM signal.

摘要翻译： 本发明的各种实施例涉及具有低峰值与平均功率比（PAPR）信号的具有高带宽效率并且具有计算效率的多变换OFDM发射机和接收机的方法和系统。 例如，发射机的各种实施例可以利用包括基带调制器，串行到并行转换器，多重组NT正交变换单元组，多重组NT逆傅里叶变换单元组，虚拟符号发生器和 用于找到最佳变换索引n0的最小PAPR评估单元。 接收机的各种实施例可以包括用于检测嵌入在OFDM信号中的变换索引的变换索引检测单元。

公开(公告)号：US08982924B2

公开(公告)日：2015-03-17

申请号：US12660615

申请日：2010-03-02

申请人： Rajendra Kumar

发明人： Rajendra Kumar

IPC分类号： H04B1/00 ,  G06F7/00 ,  H04L27/00 ,  H04L27/20

CPC分类号： G06F7/00 ,  H04L27/00 ,  H04L27/20

摘要： Various embodiments are directed to systems and methods for combining a plurality of codes. The plurality of codes may be binary codes having possible logical values of −1 and +1 and may comprise an even number of codes. An output of the combining v0,k may be given by: v0=sgn(vi), where vi is the sum of the first plurality of codes at the first time. Embodiments for allocating different power levels among various codes are presented.

摘要翻译： 各种实施例涉及用于组合多个代码的系统和方法。 多个代码可以是具有可能的逻辑值为-1和+1的二进制代码，并且可以包括偶数个代码。 组合v0，k的输出可以由下式给出：v0 = sgn（vi），其中vi是第一时间的第一个多个代码的和。 呈现了各种代码中分配不同功率电平的实施例。

公开(公告)号：US08711919B2

公开(公告)日：2014-04-29

申请号：US13434498

申请日：2012-03-29

申请人： Rajendra Kumar

发明人： Rajendra Kumar

IPC分类号： H03H7/30

CPC分类号： H04L25/03885 ,  H04B1/1081 ,  H04L25/0204 ,  H04L25/0307 ,  H04L25/03292 ,  H04L27/3416 ,  H04L27/3845

摘要： Various embodiments described herein are directed to methods and systems for blind mode adaptive equalizer system to recover complex valued data symbols from the signal transmitted over time-varying dispersive wireless channels. For example, various embodiments may utilize an architecture comprised of a channel gain normalizer, a blind mode equalizer with hierarchical structure (BMAEHS) comprised of a level 1 adaptive system and a level 2 adaptive system, and an initial data recovery subsystem. The BMAEHS may additionally be comprised of an orthogonalizer for providing a faster convergence speed. In various architectures of the invention, the BMAEHS may be replaced by a cascade of multiple equalizer stages for providing computational and other advantages. Various embodiments may employ either linear or decision feedback configurations. In the communication receiver architectures, differential encoders and decoders are presented to resolve possible ambiguities. Adaptive digital beam former architecture is presented.

摘要翻译： 本文描述的各种实施例涉及用于盲模式自适应均衡器系统的方法和系统，以从随时变分散无线信道发送的信号中恢复复值数据符号。 例如，各种实施例可以利用由信道增益归一化器，具有由1级自适应系统和2级自适应系统组成的分级结构（BMAEHS）的盲模式均衡器和初始数据恢复子系统组成的架构。 BMAEHS可以另外由用于提供更快的收敛速度的正交化器组成。 在本发明的各种架构中，BMAEHS可以由多个均衡器级联代替，以提供计算和其他优点。 各种实施例可以采用线性或决策反馈配置。 在通信接收机架构中，提出了差分编码器和解码器来解决可能的模糊性。 提出了自适应数字波束形成器架构。

公开(公告)号：US08638890B2

公开(公告)日：2014-01-28

申请号：US13465606

申请日：2012-05-07

申请人： Rajendra Kumar

发明人： Rajendra Kumar

IPC分类号： H03D1/04

CPC分类号： H04L27/12 ,  H04L27/156

摘要： A receiver may comprise a complex mixer for converting the modulated signal to a complex modulated signal comprising a first in-phase component and a first quadrature component. The receiver may further comprise a digital demodulator. The digital demodulator may comprise at least one processor circuit programmed for applying a phase differencer for generating an output function in terms of a phase difference of the complex modulated signal. Applying the phase differencer may comprise converting the first in-phase component to a function of a phase difference of the first in-phase component expressed in digital time, and converting the first quadrature component to a function of the phase difference of the first quadrature component expressed in digital time. The at least one processor circuit of the digital demodulator may also be programmed for applying a four quadrant inverse tangent to the output function to generate the information signal.

摘要翻译： 接收机可以包括用于将调制信号转换成包括第一同相分量和第一正交分量的复调制信号的复合混频器。 接收机还可以包括数字解调器。 数字解调器可以包括至少一个处理器电路，其被编程用于施加相位差分器，用于根据复调制信号的相位差产生输出函数。 应用相位差分器可以包括将第一同相分量转换为以数字时间表示的第一同相分量的相位差的函数，并将第一正交分量转换为第一正交分量的相位差的函数 以数字时代表达。 数字解调器的至少一个处理器电路也可以被编程为向输出功能施加四象限反正切以产生信息信号。

公开(公告)号：US08612651B2

公开(公告)日：2013-12-17

申请号：US12599062

申请日：2008-05-14

申请人： Johannes Boonstra ,  Sundaravaradan Rangarajan ,  Rajendra Kumar

发明人： Johannes Boonstra ,  Sundaravaradan Rangarajan ,  Rajendra Kumar

IPC分类号： G06F3/00 ,  G06G5/00

CPC分类号： G06F5/12

摘要： A FIFO memory circuit is for interfacing between circuits with different clock domains. The circuit has a FIFO memory (10), a write pointer circuit (16) clocked by the clock of a first clock domain and controlling the memory location to which data is written, and a read pointer circuit clocked by the clock of a second clock domain and controlling the memory location from which data is read. The read and write pointer circuits use gray coding. The memory circuit further comprises a duplicate write pointer circuit (30) which has its write pointer address incremented synchronously with the write pointer circuit (16), and which has a starting write address selected such that the duplicate write pointer address lags behind the write pointer address circuit by a number of address locations corresponding to the size of the FIFO memory (10). A comparator (34) compares the read pointer circuit address with the duplicate write pointer circuit address for determining a full status of the FIFO memory.

摘要翻译： FIFO存储器电路用于在具有不同时钟域的电路之间进行接口。 电路具有FIFO存储器（10），由第一时钟域的时钟定时并且控制写入数据的存储器位置的写指针电路（16）以及由第二时钟的时钟脉冲定时的读指针电路 并控制读取数据的存储器位置。 读写指针电路采用灰度编码。 存储电路还包括一个重写写指针电路（30），它具有与写指针电路（16）同步增加的写指针地址，并且具有选择的开始写地址，使得重写写指针地址落在写指针之后 地址电路由与FIFO存储器（10）的大小对应的多个地址位置。 比较器（34）将读取指针电路地址与用于确定FIFO存储器的完整状态的重复写指针电路地址进行比较。