专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US06754270B1 Encoding high-definition video using overlapping panels 失效
标题翻译：使用重叠面板编码高清视频
公开(公告)号：US06754270B1
公开(公告)日：2004-06-22
申请号：US09676063
申请日：2000-09-29
申请人： Stuart J. Golin , Agesino Primatic, Jr.
发明人： Stuart J. Golin , Agesino Primatic, Jr.
IPC分类号： H04N712
CPC分类号： G06T9/007
摘要： In encoding high-definition video signals, the method includes overlapping panels with a single row in the overlap, selecting the better-encoded one of the rows in the overlap, removing the unselected row, and merging bit streams from the panels. In deciding which one of the rows in the overlap is better encoded, a heuristic approach may be used, for example, a panel with the fewer bits, or with fewer errors or the panel as suggested by the motion vectors. Optionally, panels may be synchronized by copying the selected row in the overlap in place of the unselected row in the overlap.
摘要翻译：在编码高分辨率视频信号时，该方法包括在重叠中具有单行的重叠面板，在重叠中选择更好编码的一行，去除未选择的行，以及从面板合并位流。在决定重叠中的哪一行更好地被编码时，可以使用启发式方法，例如，具有较少位的面板或具有较少错误的面板或由运动矢量建议的面板。可选地，可以通过在重叠中复制所选行以代替重叠中的未选择的行来同步面板。

2. 发明授权

US06825853B2 Apparatus and method for color space conversion in video images 失效
标题翻译：视频图像中颜色空间转换的装置和方法
公开(公告)号：US06825853B2
公开(公告)日：2004-11-30
申请号：US10106546
申请日：2002-03-26
申请人： Hong Jiang , Agesino Primatic, Jr.
发明人： Hong Jiang , Agesino Primatic, Jr.
IPC分类号： G09G502
CPC分类号： H04N9/67
摘要： Color space conversion from a first image definition scheme to a second image definition scheme is realized by utilizing only one step of matrix multiplication and by determining whether determined RGB values are in a valid RGB region and, if not, generating a first modification factor to bring the RGB vector onto or in close proximity to the boundary of the valid RGB region. Then, the first modification factor is employed to modify in a prescribed manner the converted chroma values. In a specific embodiment of the invention, only a single matrix multiplication is employed and the otherwise additional required multiplication and/or division steps are realized by additions and/or subtractions and by employing a prescribed iterative process to bring the RGB values into or close to the valid RGB color space region. The converted chroma values are also modified by associated second modification factors also generated in the iteration process. In another specific embodiment of the invention, the converted chroma values are modified or not during an iteration depending upon whether a factor corresponding to and related to R0, G0, B0 is within a specific color space region or not. If R0, G0, B0 are within the specific color space region, the chroma values are modified by the associated second modification factors, the second modification factors are adjusted and the process is iterated. If R0, G0, B0 are other than within the specific color space region, the chroma values are not modified, the second modification factors are adjusted and the process is iterated. A prescribed number of iterations are used.
摘要翻译：通过利用矩阵乘法的一个步骤，并且通过确定确定的RGB值是否在有效的RGB区域中来实现从第一图像定义方案到第二图像定义方案的色彩空间转换，如果不是，则生成第一修改因子以产生 RGB矢量位于或接近有效RGB区域的边界。然后，使用第一修改因子以规定的方式修改转换的色度值。在本发明的具体实施例中，仅使用单个矩阵乘法，并且否则附加的所需乘法和/或除法步骤通过加法和/或减法来实现，并且通过使用规定的迭代过程来使RGB值进入或接近有效的RGB颜色空间区域。转换的色度值也通过在迭代过程中也产生的相关的第二修改因子来修改。在本发明的另一具体实施例中，根据与R0，G0，B0相对应且与R0，G0，B0相关的因素是否在特定颜色空间区域内，在迭代期间，转换的色度值被修改。如果R0，G0，B0在特定颜色空间区域内，则色度值由相关的第二修改因子修改，调整第二修改因子并重复该过程。如果R0，G0，B0不在特定颜色空间区域内，则色度值不被修改，调整第二修改因子并重复处理。使用规定的迭代次数。

3. 发明授权

US6134276A Timing recovery system 失效
标题翻译：定时恢复系统
公开(公告)号：US6134276A
公开(公告)日：2000-10-17
申请号：US52454
申请日：1998-03-31
申请人： Ahmad K. Aman , Cecil William Farrow , Hong Jiang , Agesino Primatic, Jr. , Charles Albert Webb, III
发明人： Ahmad K. Aman , Cecil William Farrow , Hong Jiang , Agesino Primatic, Jr. , Charles Albert Webb, III
IPC分类号： H03J7/04 , H03L7/091 , H04L7/033 , H04L7/04 , H04L27/00 , H04L27/06 , H04L27/14
CPC分类号： H04L7/046 , H03J7/04 , H03L7/091 , H04L27/066 , H04L7/0334 , H04L7/042 , H04L2027/0067 , H04L2027/0073 , H04L2027/0081
摘要： A digital timing recovery system advantageously employs both demodulated I-phase and Q-phase components to more accurately locate the synchronization signal of an incoming VSB signal. The Q-phase component is advantageously employed to detect the phase error. The use of the Q-phase component provides a more accurate measure of the phase error and results in a larger (wider) acquisition range for timing frequency offset. More specifically, the timing recovery system of this invention performs symbol clock recovery based on the VSB signal segment synchronization (sync) signal and generates a pulse density modulated (PDM) phase difference signal that controls a voltage controlled crystal oscillator (VCXO) in the phase-locked loop. This is realized, in one embodiment of the invention, by correlating received sync segment data with the known sync signal pattern and searching for "peaks" in the correlation values that are periodic at the known sync segment data rate. Once the sync pattern is found, the correlation values for adjacent samples are advantageously employed to generate the necessary feedback control signal value for the VCXO. Technical advantages of applicants' unique invention are that the need for an analog synchronous detector is eliminated, a more accurate measure than that obtained by prior known systems is obtained and a wider acquisition range is obtained for timing frequency offset.
摘要翻译：数字定时恢复系统有利地采用解调的I相和Q相分量来更准确地定位输入的VSB信号的同步信号。 Q相分量有利地用于检测相位误差。使用Q相分量可以更准确地测量相位误差，并导致定时频率偏移的较大（较宽）采集范围。更具体地，本发明的定时恢复系统基于VSB信号段同步（sync）信号执行符号时钟恢复，并生成在相位上控制压控晶体振荡器（VCXO）的脉冲密度调制（PDM）相位差信号锁定环。在本发明的一个实施例中，通过将接收到的同步段数据与已知的同步信号模式相关并在以已知的同步段数据速率周期性的相关值中搜索“峰值”来实现。一旦找到同步模式，有利地采用相邻采样的相关值来为VCXO生成必要的反馈控制信号值。申请人独特发明的技术优点是消除了对模拟同步检测器的需要，获得了比现有已知系统获得的更准确的测量值，并且获得了定时频率偏移的更宽的采集范围。

4. 发明授权

US06192088B1 Carrier recovery system 失效
公开(公告)号：US06192088B1
公开(公告)日：2001-02-20
申请号：US09052455
申请日：1998-03-31
申请人： Ahmad K. Aman , Cecil William Farrow , Hong Jiang , Agesino Primatic, Jr. , Charles Albert Webb, III
发明人： Ahmad K. Aman , Cecil William Farrow , Hong Jiang , Agesino Primatic, Jr. , Charles Albert Webb, III
IPC分类号： H04L2714
CPC分类号： H04L27/066 , H04L2027/0053 , H04L2027/0081 , H04L2027/0087
摘要： A digital carrier recovery system includes at least two modes of operation, namely, an acquisition mode and a tracking mode. The bandwidth of the carrier recovery loop filter is different for the acquisition mode and the tracking mode. In the acquisition mode, the digital phase-locked loop seeks and locks to the long term frequency offset of the received carrier signal. In the tracking mode, the digital phase-locked loop tracks the instantaneous variations in the carrier phase. Switching between the acquisition mode and the tracking mode is realized digitally, and includes programmable hysteresis, resulting in optimal performance in the presence of signals having high levels of phase noise (jitter). More specifically, the carrier recovery loop filter “locks” to the pilot signal of an incoming signal, e.g., a vestigial side band (VSB) video signal, by employing a so-called digital vector tracking phase-locked loop that demodulates the VSB signal. The digital vector tracking phase-locked loop includes a complex filter, i.e., a so-called vector tracking filter, that very quickly locks to the pilot signal of the passband VSB signal and once locked to the pilot signal, switches to the tracking mode that provides significantly better tracking of phase noise. The demodulation is achieved by employing a complex multiplication of the incoming signal with a complex exponential sequence to obtain an in-phase (I-phase) component and a quadrature-phase (Q-phase) component. The complex exponential sequence is generated, in one embodiment, by employing a SIN/COS look up table that is driven by a phase difference signal generated by the digital vector tracking phase-locked loop. A residual direct current (dc) component in the I-phase component caused by the pilot signal is removed, resulting in a baseband I/Q signal. A technical advantage of this carrier recovery invention is that the bandwidth of the phase-locked loop filter can be different for the acquisition mode and the tracking mode. This allows for optimal performance in both the acquisition and tracking modes of operation.

5. 发明授权

US06445752B1 Apparatus and method for phase tracking in a demodulator 有权
标题翻译：一种解调器相位跟踪的装置和方法
公开(公告)号：US06445752B1
公开(公告)日：2002-09-03
申请号：US09248904
申请日：1999-02-12
申请人： Hong Jiang , Paul L. Palmieri , Agesino Primatic, Jr. , Lesley J. Wu , Liangkai Yu
发明人： Hong Jiang , Paul L. Palmieri , Agesino Primatic, Jr. , Lesley J. Wu , Liangkai Yu
IPC分类号： H04L2714
CPC分类号： H04L27/066 , H04L1/0045 , H04L2027/003 , H04L2027/0057 , H04L2027/0067
摘要： A phase tracker receives a signal component xn and forms a phase- and gain-corrected signal zn. In particular, the phase tracker performs a Hilbert transform of xn to produce a quadrature phase component yn to form the constellation defined by (xn, yn). Consequently, phase rotation and gain adjustment are combined into a linear transform of the constellation defined by (xn, yn). The linear transform zn=&agr;xn+&bgr;yn employs two coefficients &agr; and &bgr;. The coefficients &agr; and &bgr; of the linear transform are derived so as to provide an optimal solution according to minimum mean square error. Approximations to the coefficients &agr; and &bgr; of the linear transform may be iteratively determined with a stochastic gradient method. Advantages of employing the phase- and gain-corrected signal zn as an I-phase detection result of a demodulator include 1) the phase rotation and gain adjustment are combined into one operation, and 2) the a sine/cosine lookup table is not employed. Including both phase rotation and a gain adjustment may provide for better performance of the demodulator. In addition, these advantages may result in reduced circuit complexity and reduced added error.
摘要翻译：相位跟踪器接收信号分量xn并且形成相位和增益校正信号zn。特别地，相位跟踪器执行xn的希尔伯特变换以产生正交相位分量yn，以形成由（xn，yn）定义的星座。因此，相位旋转和增益调整被组合成由（xn，yn）定义的星座的线性变换。线性变换zn = alphaxn + betayn采用两个系数α和β。导出线性变换的系数α和β，以便根据最小均方误差提供最优解。可以用随机梯度法迭代确定线性变换的系数α和β的近似值。采用相位和增益校正信号zn作为解调器的I相检测结果的优点包括1）将相位旋转和增益调整组合成一个操作，2）不使用正弦/余弦查找表。包括相位旋转和增益调整都可以提供更好的解调器性能。此外，这些优点可能导致电路复杂度降低和附加误差降低。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式