利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

132 条记录 (耗时 0.04 秒)

    Burst demodulator for use in high speed bidirectional digital cable transmission system
    1.
    发明授权
    Burst demodulator for use in high speed bidirectional digital cable transmission system 失效
    突发解调器用于高速双向数字电缆传输系统

    公开(公告)号：US06298098B1

    公开(公告)日：2001-10-02

    申请号：US09022467

    申请日：1998-02-12

    申请人： Norman F. Krasner ,  Allen Ponsford Edwards ,  William G. Xenakis ,  Bruce J. Currivan

    发明人： Norman F. Krasner ,  Allen Ponsford Edwards ,  William G. Xenakis ,  Bruce J. Currivan

    IPC分类号： H04L2510

    CPC分类号： H04L7/046

    摘要： A hybrid fiber/coax digital data transmission system in which data from a plurality of subscribers are transmitted upstream to a headend demodulator in a series of data bursts. The headend demodulator acquires and synchronizes a data burst by detecting a BPSK preamble having a repetitive one and zero pattern (10101010101000). The pattern is detected by integrating clock energy in an envelope of a preamble length transmission and using the last three symbols (0,0,0) as a frame marker after differential decoding. Noise in the system is periodically measured by detecting an empty burst placed periodically in the data stream. A first-in, first-out (FIFO) memory allows closer spacing for the data bursts by permitting asynchronous received and output clocks.

    摘要翻译： 一种混合光纤/同轴电缆数字数据传输系统，其中来自多个用户的数据在一系列数据突发中向上游发送到头端解调器。 前端解调器通过检测具有重复的一个和零个模式的BPSK前导码（10101010101000）来获取和同步一个数据突发。 通过在前导码长度传输的包络中集成时钟能量并且在差分解码之后使用最后三个符号（0,0,0）作为帧标记来检测模式。 通过检测在数据流中周期性地放置的空脉冲来周期性地测量系统中的噪声。 先进先出（FIFO）存储器通过允许异步接收和输出时钟允许数据突发的更紧密的间隔。

    Digital to analog converter (DAC) with ternary or tri-state current source
    4.
    发明授权
    Digital to analog converter (DAC) with ternary or tri-state current source 失效
    具有三态或三态电流源的数模转换器（DAC）

    公开(公告)号：US08471745B2

    公开(公告)日：2013-06-25

    申请号：US13349260

    申请日：2012-01-12

    申请人： Bruce J. Currivan ,  Thomas J. Kolze ,  Ramon A. Gomez

    发明人： Bruce J. Currivan ,  Thomas J. Kolze ,  Ramon A. Gomez

    IPC分类号： H03M1/66

    CPC分类号： H04B1/10 ,  H03M1/0614 ,  H03M1/68

    摘要： Digital to analog converter (DAC) with ternary or tri-state current source. A DAC including a number of ternary or tri-state devices operates based upon codewords provided thereto. Generally, each respective codeword bit directs operation of one of the respective ternary or tri-state devices within the DAC. Each ternary or tri-state device operates in at least three respective operational states (e.g., based upon the respective values of +1, −1, or 0 being provided thereto). In a current source implementation, each respective current source is implemented to deliver current, draw current, or neither delivered or draw current. In a voltage source implementation, each respective voltage source is implemented to provide a positive voltage, a negative voltage, or provide no voltage. A DAC coding table may be designed based upon characterization of codewords provided to one or more DACs (e.g., based upon a distribution, a probability density function (PDF), etc. of such codewords).

    摘要翻译： 具有三态或三态电流源的数模转换器（DAC）。 包括多个三态或三态设备的DAC基于提供给它的码字来操作。 通常，每个相应的码字比特指示DAC内的相应三态或三态设备之一的操作。 每个三态或三态设备以至少三个相应的操作状态（例如，基于向其提供+1，-1或0的相应值）操作。 在当前的源实现中，实现每个相应的电流源以传递电流，绘制电流，或者不传送或绘制电流。 在电压源实现中，实施每个相应的电压源以提供正电压，负电压或不提供电压。 可以基于提供给一个或多个DAC（例如，基于分布，这种码字的概率密度函数（PDF）等）的码字的表征来设计DAC编码表。

    Histogram-Based Linearization of Analog-to-Digital Converters
    5.
    发明申请
    Histogram-Based Linearization of Analog-to-Digital Converters 审中-公开
    模数转换器的基于直方图的线性化

    公开(公告)号：US20130085703A1

    公开(公告)日：2013-04-04

    申请号：US13249845

    申请日：2011-09-30

    申请人： Ray (Ramon) GOMEZ ,  Bruce J. Currivan ,  Lin He ,  Loke Tan ,  Frank Van der Goes ,  Cy (Chun-Ying) Chen ,  Jiangfeng Wu ,  Thomas Kolze

    发明人： Ray (Ramon) GOMEZ ,  Bruce J. Currivan ,  Lin He ,  Loke Tan ,  Frank Van der Goes ,  Cy (Chun-Ying) Chen ,  Jiangfeng Wu ,  Thomas Kolze

    IPC分类号： G06F17/17 ,  G06F19/00

    CPC分类号： G06F17/17 ,  H03M1/1042 ,  H03M1/12

    摘要： Embodiments provide histogram-based methods and system to estimate the transfer function of an ADC, and subsequently to linearize a non-linear ADC transfer function. Embodiments include blind algorithms that require no a priori knowledge of the input signal distribution. Embodiments can be implemented using cumulative (i.e., cumulative distribution function (CDF)) or non-cumulative (i.e., probability density function (PDF)) histograms. According to embodiments, a non-linear transfer function can be estimated by linearly approximating successive local intervals of the transfer function. Linearly approximated successive local intervals of the transfer function can then be used to fully characterize and closely estimate the transfer function.

    摘要翻译： 实施例提供基于直方图的方法和系统来估计ADC的传递函数，并且随后对非线性ADC传递函数进行线性化。 实施例包括不需要输入信号分布的先验知识的盲算法。 实施例可以使用累积（即，累积分布函数（CDF））或非累积（即，概率密度函数（PDF））直方图来实现。 根据实施例，可以通过线性近似传递函数的连续局部间隔来估计非线性传递函数。 传递函数的线性逼近的连续局部间隔可用于完全表征和密切估计传递函数。

    Distortion and aliasing reduction for digital to analog conversion
    6.
    发明授权
    Distortion and aliasing reduction for digital to analog conversion 失效

    公开(公告)号：US08411791B2

    公开(公告)日：2013-04-02

    申请号：US13223124

    申请日：2011-08-31

    申请人： Thomas J. Kolze ,  Bruce J. Currivan ,  Ramon A. Gomez

    发明人： Thomas J. Kolze ,  Bruce J. Currivan ,  Ramon A. Gomez

    IPC分类号： H04K1/02 ,  H04L25/03 ,  H04L25/49

    CPC分类号： H04B1/10 ,  H03M1/0614 ,  H03M1/68

    摘要： Distortion and aliasing reduction for digital to analog conversion. Synthesis of one or more distortion terms made based on a digital signal (e.g., one or more digital codewords) is performed in accordance with digital to analog conversion. The one or more distortion terms may correspond to aliased higher-order harmonics, distortion, nonlinearities, clipping, etc. Such distortion terms may be known a priori, such as based upon particular characteristics of a given device, operational history, etc. Alternatively, such distortion terms may be determined based upon operation of a device and/or based upon an analog signal generated from the analog to conversion process. For example, frequency selective measurements made based on an analog signal generated from the digital to analog conversion may be used for determination of and/or adaptation of the one or more distortion terms. One or more DACs may be employed within various architectures operative to perform digital to analog conversion.

    Distortion and aliasing reduction for digital to analog conversion
    7.
    发明授权
    Distortion and aliasing reduction for digital to analog conversion 有权

    公开(公告)号：US08406340B2

    公开(公告)日：2013-03-26

    申请号：US13223156

    申请日：2011-08-31

    申请人： Thomas J. Kolze ,  Bruce J. Currivan ,  Ramon A. Gomez

    发明人： Thomas J. Kolze ,  Bruce J. Currivan ,  Ramon A. Gomez

    IPC分类号： H04L1/02 ,  H04L25/03 ,  H04L25/49

    CPC分类号： H04B1/10 ,  H03M1/0614 ,  H03M1/68

    摘要： Distortion and aliasing reduction for digital to analog conversion. Synthesis of one or more distortion terms made based on a digital signal (e.g., one or more digital codewords) is performed in accordance with digital to analog conversion. The one or more distortion terms may correspond to aliased higher-order harmonics, distortion, nonlinearities, clipping, etc. Such distortion terms may be known a priori, such as based upon particular characteristics of a given device, operational history, etc. Alternatively, such distortion terms may be determined based upon operation of a device and/or based upon an analog signal generated from the analog to conversion process. For example, frequency selective measurements made based on an analog signal generated from the digital to analog conversion may be used for determination of and/or adaptation of the one or more distortion terms. One or more DACs may be employed within various architectures operative to perform digital to analog conversion.

    Method and system of tracking and stabilizing an image transmitted using video telephony
    9.
    发明授权
    Method and system of tracking and stabilizing an image transmitted using video telephony 有权
    跟踪和稳定使用视频电话传输的图像的方法和系统

    公开(公告)号：US08379074B2

    公开(公告)日：2013-02-19

    申请号：US12755202

    申请日：2010-04-06

    申请人： Bruce J. Currivan ,  Xuemin Chen

    发明人： Bruce J. Currivan ,  Xuemin Chen

    IPC分类号： H04N7/14

    CPC分类号： H04N7/141

    摘要： Herein described is a system and method that tracks the face of a person engaged in a videophone conversation. In addition to performing facial tracking, the invention provides stabilization of facial images that are transmitted during the videophone conversation. The face is tracked by employing one or more algorithms that correlate videophone captured facial images against a stored facial image. The face may be better identified by way of employing one or more voice recognition algorithms. The one or more voice recognition algorithms may correlate utterances of the person engaged in a conversation to one or more stored utterances. The identified utterances are subsequently mapped to a stored facial image. In a representative embodiment, the system used for performing facial tracking and image stabilization comprises an image sensor, a lens, an actuator, and a controller/processor.

    摘要翻译： 这里描述了跟踪参与可视电话会话的人的面部的系统和方法。 除了执行面部跟踪之外，本发明提供了在可视电话会话期间传送的面部图像的稳定性。 通过采用将可视电话捕获的面部图像与存储的面部图像相关联的一种或多种算法来跟踪面部。 可以通过采用一种或多种语音识别算法来更好地识别脸部。 一个或多个语音识别算法可以将从事对话的人的话语与一个或多个存储的话语相关联。 所识别的话语随后映射到存储的面部图像。 在代表性的实施例中，用于执行面部跟踪和图像稳定的系统包括图像传感器，透镜，致动器和控制器/处理器。