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21. 发明授权

US5506636A HDTV signal receiver with imaginary-sample-presence detector for QAM/VSB mode selection 失效
标题翻译：具有用于QAM / VSB模式选择的虚拟样本存在检测器的HDTV信号接收机
公开(公告)号：US5506636A
公开(公告)日：1996-04-09
申请号：US266751
申请日：1994-06-28
申请人： Chandrakant B. Patel , Allen L. Limberg
发明人： Chandrakant B. Patel , Allen L. Limberg
IPC分类号： H04L27/00 , H04N5/44 , H04N5/455 , H04N5/46 , H04N7/015
CPC分类号： H04N5/4401 , H04N5/455 , H04N5/46 , H04L27/34
摘要： A radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a complex-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner. The final IF signal from the tuner is digitized for application to in-phase and quadrature QAM synchronous detectors and to in-phase and quadrature VSB synchronous detectors. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of symbol frequency by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner. The mean average energy in the output samples of the quadrature VSB synchronous detector is sensed for automatically switching the radio receiver reception mode, for operation in a VSB HDTV signal reception mode when the mean average energy is below a threshold level, and for operation in a QAM signal reception mode when the mean average energy is not below the threshold level.
摘要翻译：一种用于使用相同的调谐器接收所选数字HDTV信号的无线电接收机，而不管其是复调幅度调制（QAM）还是残留边带（VSB）信号。来自调谐器的最终IF信号被数字化以应用于同相和正交QAM同步检波器以及同相和正交VSB同步检波器。通过将数字电路中开发的自动频率和相位控制信号应用于调谐器的本地振荡器，QAM和VSB最终IF信号的载波频率被调节为符号频率的分数。感测正交VSB同步检测器的输出样本中的平均能量，以便在平均能量低于阈值水平时自动切换无线电接收器接收模式，以便在VSB HDTV信号接收模式下操作，并且在当平均能量不低于阈值水平时，QAM信号接收模式。

22. 发明授权

US5053615A Correction algorithm for contiguous CCD elements leakage 失效
标题翻译：连续CCD元件泄漏的校正算法
公开(公告)号：US5053615A
公开(公告)日：1991-10-01
申请号：US505479
申请日：1990-04-06
申请人： Chandrakant B. Patel
发明人： Chandrakant B. Patel
IPC分类号： H04N5/21 , G06K9/56 , G06T5/20 , H04N1/00 , H04N5/14 , H04N5/359 , H04N5/369
CPC分类号： H04N5/3591 , G06T5/20 , H04N5/372
摘要： A row scanner (24) sequentially reads signals derived from charges on an array (10) of photosensitive elements disposed in rows and columns, and serially applied the resulting signals to a finite impulse filter (30). Within the finite impulse filter (30), the resulting signal serially read are added to provide intermediate signals corresponding to photosensitive elements equal distantly spaced from the one photosensitive element considered, and the sums of those intermediate signals are corrected by factors either measured or empirically determined for the photosensitive elements within each circle to provide a plurality of correction signals. The correction signals are accumulatively subtracted from the uncorrected resulting image signal read from the photosensitive element considered, to provide a final image signal corrected for undesired contributions due to leakage from neighboring photosensitive elements in a plurality of circles of photosensitive elements of increasing radius.
摘要翻译：行扫描器（24）顺序地读取从放置在行和列中的感光元件的阵列（10）上的电荷得到的信号，并将所得到的信号串行地施加到有限脉冲滤波器（30）。在有限脉冲滤波器（30）内，将所得到的串行读取信号相加以提供对应于与所考虑的一个感光元件相距遥远的光敏元件的中间信号，并且这些中间信号的和通过测量或经验确定的因子来校正对于每个圆周内的感光元件提供多个校正信号。从所考虑的感光元件读出的未校正的所得图像信号累积地减去校正信号，以提供由于在增加半径的多个感光元件的圆周中的相邻感光元件的泄漏而对不期望的贡献进行校正的最终图像信号。

23. 发明授权

US4862271A Video signal interpolator with peaking 失效
标题翻译：具有峰值的视频信号插值器
公开(公告)号：US4862271A
公开(公告)日：1989-08-29
申请号：US228192
申请日：1988-08-04
申请人： Terrence R. Smith , Michael A. Isnardi , Jack S. Fuhrer , Chandrakant B. Patel
发明人： Terrence R. Smith , Michael A. Isnardi , Jack S. Fuhrer , Chandrakant B. Patel
IPC分类号： H04N11/24
CPC分类号： H04N11/008
摘要： In a video signal expanding/compressing system including a video signal interpolator, video signals are peaked prior to interpolation. The amount of peaking is controlled in response to a signal representative of the distance between a pixel of an expanded/compressed video signal and a corresponding pixel of an original video signal.
摘要翻译：在包括视频信号内插器的视频信号扩展/压缩系统中，视频信号在插值之前达到峰值。响应于表示扩展/压缩视频信号的像素与原始视频信号的相应像素之间的距离的信号来控制峰化量。

24. 发明授权

US06377312B1 Adaptive fractionally spaced equalizer for received radio transmissions with digital content, such as DTV signals 有权
$Adaptive fractionally spaced equalizer for received radio transmissions with digital content, such as DTV signals$
标题翻译：用于具有数字内容的接收无线电传输的自适应分数间隔均衡器，例如DTV信号
公开(公告)号：US06377312B1
公开(公告)日：2002-04-23
申请号：US09373588
申请日：1999-08-13
申请人： Allen LeRoy Limberg , Chandrakant B. Patel
发明人： Allen LeRoy Limberg , Chandrakant B. Patel
IPC分类号： H04N521
CPC分类号： H04N5/211
摘要： In a radio receiver for digital transmissions, an adaptive channel equalizer is clocked at a sampling rate higher than symbol rate by a factor k and employs decision feedback for adjusting the coefficients of its component filters. The channel equalizer response as supplied at the sampling rate k times symbol rate is decimated to symbol rate and quantized to generate a signal estimating the symbols transmitted to the receiver. The channel equalizer response as supplied at the sampling rate k times symbol rate is compared to the signal estimating the transmitted symbols as re-sampled to the sampling rate k times symbol rate, in order to develop decision-feedback error signal at the sampling rate k times symbol rate. This decision-feedback error signal has sufficient digital bandwidth to permit fractionally spaced equalization with all coefficients being optimally adjusted.
摘要翻译：在用于数字传输的无线电接收机中，自适应信道均衡器以比符号速率高一个因子k的采样率被计时，并采用判决反馈来调整其分量滤波器的系数。以采样率k倍符号率提供的信道均衡器响应被抽取到符号速率并被量化以产生估计发送到接收机的符号的信号。将以采样率k倍符号率提供的信道均衡器响应与估计被重新采样到采样率k倍符号率的发送符号的信号进行比较，以便以采样率k开发判决反馈误差信号倍符号率。该判决反馈误差信号具有足够的数字带宽以允许分数间隔的均衡，所有系数都被最佳地调整。

25. 发明授权

US06300984B1 Ghost-cancellation reference signals using spaced PN sequences 失效
标题翻译：使用间隔PN序列的Ghost-Cancellation参考信号
公开(公告)号：US06300984B1
公开(公告)日：2001-10-09
申请号：US09217631
申请日：1998-12-22
申请人： Allen LeRoy Limberg , Chandrakant B. Patel
发明人： Allen LeRoy Limberg , Chandrakant B. Patel
IPC分类号： H04N521
CPC分类号： H04L25/03006 , H04L2025/03789 , H04N5/211 , H04N5/4401 , H04N5/46 , H04N5/62
摘要： Training signal for channel equalization is located in the initial data segment of each DTV data field or in the nineteenth scan line of each NTSC field. The training signal comprises a pseudo-random noise sequence near the conclusion of the initial data segment of each DTV data field or the nineteenth scan line of each NTSC field and an earlier pseudo-random noise sequence. The later pseudo-random noise sequence is used in a television receiver for detecting pre-ghosts and the earlier pseudo-random noise sequence is used in a television receiver for detecting post-ghosts.
摘要翻译：用于信道均衡的训练信号位于每个DTV数据字段的初始数据段或每个NTSC字段的第十九扫描行中。训练信号包括在每个DTV数据场或每个NTSC场的第十九扫描线和较早的伪随机噪声序列的初始数据段的结尾附近的伪随机噪声序列。后来的伪随机噪声序列用于检测预重影的电视接收机中，并且较早的伪随机噪声序列用于检测后重影的电视接收机中。

26. 发明授权

US6124898A Digital television receiver with equalization performed on digital intermediate-frequency signals 有权
标题翻译：数字电视接收机采用数字中频信号进行均衡
公开(公告)号：US6124898A
公开(公告)日：2000-09-26
申请号：US335516
申请日：1999-06-18
申请人： Chandrakant B. Patel , Allen LeRoy Limberg
发明人： Chandrakant B. Patel , Allen LeRoy Limberg
IPC分类号： H04N5/213 , H04N5/455
CPC分类号： H04L1/0065 , H04L25/03057 , H04L27/02 , H04N21/4382 , H04N5/211 , H04L2025/03356 , H04L2025/03382 , H04L2025/03503 , H04N5/455
摘要： A digital television signal receiver in a television set or in a digital video recorder digitizes received digital television signal as converted in frequency to a final intermediate-frequency band close to baseband, then performs equalization filtering on the digitized signal before demodulating it in the digital regime to regenerate baseband symbol coding. The equalization filtering is adaptive, and weighting coefficients for this filtering are adjusted in response to portions of the regenerated baseband symbol coding. Initial adjustment of the weighting coefficients is preferably done using selected portions of the data field synchronizing signal as a ghost cancellation reference signal, in order that convergence of the weighting coefficients to desired values proceeds more rapidly. Thereafter, adjustment of the weighting coefficients is preferably done using decision-directed methods that are continuously employed on all regenerated baseband symbols, better to track changing multipath conditions should they occur.
摘要翻译：电视机或数字视频录像机中的数字电视信号接收机将接收到的频率转换的数字电视信号数字化为接近基带的最终中频带，然后对数字信号进行均衡滤波，然后以数字方式对其进行解调以再生基带符号编码。均衡滤波是自适应的，并且响应于再生的基带符号编码的部分来调整用于该滤波的加权系数。加权系数的初始调整优选地使用数据场同步信号的选定部分作为重影消除参考信号进行，以便加权系数到期望值的收敛更快地进行。此后，优选地使用在所有再生的基带符号上连续采用的决策方法来进行加权系数的调整，更好地跟踪当它们发生变化的多径条件时。

27. 发明授权

US6118495A Training signal in plural PN sequences near beginnings of data segments of DTV signal or scan lines of NTSC signal 有权
标题翻译：在DTV信号或NTSC信号的扫描线的数据段的开始附近的多个PN序列中的训练信号
公开(公告)号：US6118495A
公开(公告)日：2000-09-12
申请号：US218015
申请日：1998-12-22
申请人： Allen LeRoy Limberg , Chandrakant B. Patel
发明人： Allen LeRoy Limberg , Chandrakant B. Patel
IPC分类号： H04L25/03 , H04N5/21 , H04N5/44 , H04N5/46 , H04N5/62 , H04N5/213
CPC分类号： H04L25/03006 , H04N5/211 , H04N5/4401 , H04N5/46 , H04N5/62 , H04L2025/03789 , Y10S348/914
摘要： Training signal for channel equalization is located in the initial data segment of each DTV data field and in the nineteenth scan line of each NTSC field. Arranging for training signal separated from plural PN sequences near the beginnings of the initial data segments of DTV data fields improves post-ghost detection capability in the DTV system. In receivers for receiving NTSC signals and DTV signals, arranging for training signal to be separated from plural PN sequences near the beginnings of the nineteenth scan line of each NTSC field facilitates the same ghost-cancellation and channel-equalization filtering being used both during the reception of NTSC signals and during the reception of DTV signals.
摘要翻译：用于信道均衡的训练信号位于每个DTV数据字段的初始数据段和每个NTSC字段的第十九扫描行中。在DTV数据字段的初始数据段开始附近的多个PN序列分离的训练信号的排列改善了DTV系统中的重影后检测能力。在用于接收NTSC信号和DTV信号的接收机中，排列要从每个NTSC场的第十九扫描线开始附近的多个PN序列分离的训练信号有助于在接收期间使用相同的重影消除和信道均衡滤波的NTSC信号和DTV信号的接收期间。

28. 发明授权

US5606579A Digital VSB detector with final IF carrier at submultiple of symbol rate, as for HDTV receiver 失效
标题翻译：数字VSB检测器与符号率相同的最终IF载波，如HDTV接收机
公开(公告)号：US5606579A
公开(公告)日：1997-02-25
申请号：US247753
申请日：1994-05-23
申请人： Chandrakant B. Patel , Allen L. Limberg
发明人： Chandrakant B. Patel , Allen L. Limberg
IPC分类号： H04N7/015 , H03D1/24 , H04L27/02 , H04N5/44 , H04N5/455
CPC分类号： H03D1/24 , H04L27/02 , H04N5/4401 , H04N5/455
摘要： In a radio receiver for receiving vestigial sideband (VSB) signals including symbol codes descriptive of digital signals, HDTV signals being exemplary of such VSB signals, a tuner provides for selecting one of channels at different locations in a frequency band used for transmitting such VSB signals. The tuner also includes mixers for performing plural conversion of the selected channel to a final intermediate-frequency (IF) signal, which is digitized by an analog-to-digital converter. The pilot carrier is detected by a narrowband quadrature-phase synchronous detector operative in the digital regime, for controlling the frequency and phase of the local oscillations applied to one of the mixers in the tuner so that the pilot carrier component of the final IF signal is locked to a submultiple of symbol frequency. The fullband final IF signal is synchronously detected by an in-phase synchronous detector to detect symbol codes. The departures of the actual symbol code levels from the ideal ones are detected by a symbol synchronizer and are used in generating corrections for the phasing of the sampling of the final IF signal when it is digitized by the analog-to-digital converter. The ideal symbol code levels in the fullband final IF signal are inferred from the amplitude of the pilot carrier as detected by a narrowband in-phase synchronous detector operative in the digital regime, for example.
摘要翻译：在用于接收包括描述数字信号的符号代码的残留边带（VSB）信号的无线电接收机中，HDTV信号是这样的VSB信号的示例，调谐器提供用于在用于发送这样的VSB信号的频带中的不同位置处选择一个信道。调谐器还包括用于执行所选频道的多个转换到由模数转换器数字化的最终中频（IF）信号的混频器。导频载波由在数字方式中操作的窄带正交相位同步检测器检测，用于控制施加到调谐器中的一个混频器的本地振荡的频率和相位，使得最终IF信号的导频载波分量为锁定到符号频率的多项。全频带最终IF信号由同相同步检波器同步检测，以检测符号码。实际符号代码电平与理想值的偏差由符号同步器检测，并用于在由模数转换器数字化时对最终IF信号的采样的相位进行相位调整。例如，通过在数字方式中操作的窄带同相同步检测器检测到的全频带最终IF信号中的理想符号码电平从导频载波的振幅推断出。

29. 发明授权

US5532755A Apparatus for suppressing ghosts in signals modulating a carrier in quadrature phasing with a video carrier 失效
标题翻译：用于抑制用视频载体正交相位调制载波的信号中的重影的装置
公开(公告)号：US5532755A
公开(公告)日：1996-07-02
申请号：US179616
申请日：1994-01-05
申请人： Chandrakant B. Patel , Jian Yang
发明人： Chandrakant B. Patel , Jian Yang
IPC分类号： H03H15/00 , H03H17/00 , H03H21/00 , H04B1/10 , H04B3/04 , H04L27/18 , H04N5/21 , H04N5/44
CPC分类号： H04N5/211
摘要： Composite video signal and a relatively low power phase-shift-keyed (PSK) signal encoding digital information are transmitted on respective phases of a video carrier in quadrature with each other. Selected scan lines of the composite video signal contain ghost-cancellation reference (GCR) signals. A digital signal receiver performs a first detection of the video carrier modulated in the two phases, down-converting to an intermediate-frequency (IF) signal. This IF signal is selectively amplified prior to respective second detection of the down-converted video carrier by in-phase and quadrature-phase synchronous video detectors. A first cascade filter connection of a first ghost-cancellation filter and a first equalization filter follows the in-phase video detector, and a second cascade filter connection of a second ghost-cancellation filter and a second equalization filter follows the quadrature-phase video detector. Gating circuitry selects scan lines containing GCR signals from the video signal response of the first cascade filter connection for accumulation, which generates separated ghosted GCR signal for use by a computer such as a microcomputer. Adjustable parameters of the ghost-cancellation filters are adjusted in parallel responsive to computer calculations, while adjustable parameters of the equalization filters are also adjusted in parallel responsive to further computer calculations. Iterative feedback reduces ghosts in the response of the first cascade filter connection. Ghosts in the response of the second cascade filter connection are reduced in an analogous manner.
摘要翻译：复合视频信号和相对较低功率的相移键控（PSK）信号编码数字信息在视频载波的各个相位上彼此正交地发送。复合视频信号的选定扫描线包含重影消除参考（GCR）信号。数字信号接收机对在两相调制的视频载波进行第一次检测，下变频到中频（IF）信号。在通过同相和正交相位同步视频检测器对下变频视频载波进行相应的第二次检测之前，该IF信号被选择性地放大。第一重影消除滤波器和第一均衡滤波器的第一级联滤波器连接跟随在同相视频检测器中，并且第二重影消除滤波器和第二均衡滤波器的第二级联滤波器连接遵循正交相位视频检测器。选通电路从第一级联滤波器连接的视频信号响应中选择包含GCR信号的扫描线进行累积，产生分离的重影GCR信号，供微计算机等计算机使用。响应于计算机计算，并行地调整重影消除滤波器的可调参数，同时响应于进一步的计算机计算，均衡滤波器的可调参数也被并行调整。迭代反馈减少了第一级联滤波器连接响应中的重影。以类似的方式减少第二级联滤波器连接的响应中的幽灵。

30. 发明授权

US5479449A Digital VSB detector with bandpass phase tracker, as for inclusion in an HDTV receiver. 失效
标题翻译：带有带通相位跟踪器的数字VSB检测器，用于包含在HDTV接收机中。
公开(公告)号：US5479449A
公开(公告)日：1995-12-26
申请号：US237896
申请日：1994-05-04
申请人： Chandrakant B. Patel , Allen L. Limberg
发明人： Chandrakant B. Patel , Allen L. Limberg
IPC分类号： H04B1/16 , H04L27/02 , H04L27/06 , H04N5/52 , H04N7/015 , H04N21/2383 , H04N21/438
CPC分类号： H04N21/2383 , H04L27/02 , H04N21/4382
摘要： In a radio receiver for receiving vestigial sideband (VSB) signals including symbol codes descriptive of digital signals, HDTV signals being exemplary of such VSB signals, a tuner provides for selecting one of channels at different locations in a frequency band used for transmitting such VSB signals. The tuner also includes mixers for performing plural conversion of the selected channel to a final intermediate-frequency signal, which is digitized by an analog-to-digital converter. A phase tracker, operative on narrow-bandpass filtered portions of the digitized final intermediate-frequency signal centering on its carrier frequency, suppresses an imaginary portion of the final intermediate-frequency signal, arising from multipath distortion or from phase incoherency in local oscillations used during frequency conversion. A digital controlled oscillator in the phase tracker supplies digital descriptions of the carrier wave for the final intermediate-frequency signal to a synchronous detector, which synchronous detector detects the real portion of the digitized final intermediate-frequency signal in accordance with those digital descriptions of the carrier wave.
摘要翻译：在用于接收包括描述数字信号的符号代码的残留边带（VSB）信号的无线电接收机中，HDTV信号是这样的VSB信号的示例，调谐器提供用于在用于发送这样的VSB信号的频带中的不同位置处选择一个信道。调谐器还包括用于执行所选频道的多个转换到由模数转换器数字化的最终中频信号的混频器。基于其载波频率的数字化的最终中频信号的窄带通滤波部分的相位跟踪器抑制由多径失真引起的最终中频信号的虚部，或从多径失真引起的本地振荡中的相位不相干性变频。相位跟踪器中的数字控制振荡器将最终中频信号的载波的数字描述提供给同步检波器，该同步检测器根据这些数字描述的数字化最终中频信号的实际部分载波。

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