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11. 发明授权

US06333767B1 Radio receivers for receiving both VSB and QAM digital television signals with carriers offset by 2.69 MHz 失效
标题翻译：用于接收VSB和QAM数字电视信号的无线电接收机，载波被2.69MHz偏移
公开(公告)号：US06333767B1
公开(公告)日：2001-12-25
申请号：US09066893
申请日：1998-04-28
申请人： Chandrakant B. Patel , Allen LeRoy Limberg
发明人： Chandrakant B. Patel , Allen LeRoy Limberg
IPC分类号： H04N327
CPC分类号： H04N5/4446 , H03D1/24 , H03D5/00 , H04B1/28 , H04L1/0054 , H04L27/02 , H04N5/4401 , H04N5/455
摘要： A radio receiver uses the same tuner for receiving a selected digital television (DTV) signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal. The tuner supplies a final IF signal in a 6-MHz-wide frequency band, the lowest frequency of which is not appreciably more than 2.69 MHz. The final IF signal is digitized at a rate that is a multiple of both the symbol frequencies of the QAM and VSB signals, for synchrodyning to baseband, with the 2.69 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of the multiple of both the symbol frequencies of the QAM and VSB signals by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner.
摘要翻译：无线电接收机使用相同的调谐器来接收选择的数字电视（DTV）信号，而不管它是正交幅度调制（QAM）还是残留边带（VSB）信号。调谐器在6MHz宽的频带中提供最终的IF信号，其最低频率不大于2.69MHz。最后的IF信号以QAM和VSB信号的符号频率的倍数的数字化数字化，用于同步到基带，QAM和VSB信号的载波频率之间的2.69 MHz差异被考虑在数字同步电路。将QAM和VSB最终IF信号的载波频率通过将在数字电路中产生的自动频率和相位控制信号应用于调谐器的本地振荡器来调节为QAM和VSB信号的符号频率的倍数的分数。

12. 发明授权

US5999223A System for controlling the operating mode of an adaptive equalizer within a digital TV signal receiver 失效
标题翻译：用于控制数字TV信号接收机内的自适应均衡器的操作模式的系统
公开(公告)号：US5999223A
公开(公告)日：1999-12-07
申请号：US59345
申请日：1998-04-14
申请人： Chandrakant B. Patel , Allen LeRoy Limberg
发明人： Chandrakant B. Patel , Allen LeRoy Limberg
IPC分类号： H03D1/24 , H03D5/00 , H04B1/28 , H04L1/00 , H04L27/02 , H04N5/44 , H04N5/455 , H04N7/24
CPC分类号： H04N5/4446 , H03D1/24 , H03D5/00 , H04B1/28 , H04L1/0054 , H04L27/02 , H04N5/4401 , H04N5/455
摘要： A radio receiver for receiving a selected DTV signal that can be a quadrature-amplitude-modulation (QAM) signal or a vestigial sideband (VSB) signal synchrodynes the received signal to baseband and supplies the baseband signal to an adaptive equalizer. The presence of the pilot carrier accompanying a selected VSB DTV signal is detected for automatically switching the radio receiver for operation in a VSB signal reception mode, in which operating mode the adaptive equalizer is conditioned to respond to training signals included in the initial data segment of each data field of the VSB signal. The absence of pilot carrier accompanying a selected QAM DTV signal is detected for automatically switching the radio receiver for operation in a QAM signal reception mode, in which operating mode the adaptive equalizer is conditioned to operate without relying on the training signals included in the VSB signal.
摘要翻译：用于接收可以是正交幅度调制（QAM）信号或残留边带（VSB）信号的所选择的DTV信号的无线电接收机将接收的信号同步到基带，并将基带信号提供给自适应均衡器。检测伴随选定的VSB DTV信号的导频载波的存在，以便在VSB信号接收模式中自动切换无线电接收机以进行操作，其中自适应均衡器被操作以响应包括在初始数据段中的训练信号 VSB信号的每个数据字段。检测到伴随选定的QAM DTV信号的导频载波的不存在用于自动切换无线电接收机以在QAM信号接收模式中操作，其中自适应均衡器被调节为操作的操作模式，而不依赖于包括在VSB信号中的训练信号。

13. 发明授权

US5966188A Decimation of baseband DTV signals prior to channel equalization in digital television signal receivers 失效
标题翻译：在数字电视信号接收机的信道均衡之前抽取基带DTV信号
公开(公告)号：US5966188A
公开(公告)日：1999-10-12
申请号：US21946
申请日：1998-02-11
申请人： Chandrakant B. Patel , Allen LeRoy Limberg
发明人： Chandrakant B. Patel , Allen LeRoy Limberg
IPC分类号： H03D1/24 , H03D5/00 , H04B1/28 , H04L1/00 , H04N5/44 , H04N5/455
CPC分类号： H04N5/4446 , H03D1/24 , H03D5/00 , H04B1/28 , H04L1/0054 , H04L1/0071 , H04N5/4401 , H04N5/455
摘要： A radio receiver uses the same tuner for receiving a selected digital television (DTV) signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal. The final IF signal is digitized at a rate that is a multiple of both the symbol frequencies of the QAM and VSB signals, for synchrodyning to baseband. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of the multiple of both the symbol frequencies of the QAM and VSB signals by applying automatic frequency and phase control (AFPC) signals developed in the digital circuitry to a local oscillator of the tuner. Baseband DTV signals obtained by synchrodyning the final IF signals have a sample rate higher than symbol rate to facilitate symbol synchronization. The baseband DTV signals are decimated to symbol rate before performing channel equalization to reduce the number of multipliers required in the channel equalization filter.
摘要翻译：无线电接收机使用相同的调谐器来接收选择的数字电视（DTV）信号，而不管它是正交幅度调制（QAM）还是残留边带（VSB）信号。最后的IF信号以QAM和VSB信号的符号频率的倍数的速率被数字化，用于与基带同步。通过将在数字电路中开发的自动频率和相位控制（AFPC）信号应用于本地振荡器，QAM和VSB最终IF信号的载波频率被调节为QAM和VSB信号的符号频率的倍数的倍数的调谐器。通过同步最终IF信号获得的基带DTV信号具有高于符号率的采样率，以促进符号同步。在执行信道均衡之前，将基带DTV信号抽取到符号速率，以减少信道均衡滤波器中所需的乘法器数量。

14. 发明授权

US5959699A Reception mode control in radio receivers for receiving both VSB and QAM digital television signals 失效
标题翻译：用于接收VSB和QAM数字电视信号的无线电接收机中的接收模式控制
公开(公告)号：US5959699A
公开(公告)日：1999-09-28
申请号：US82530
申请日：1998-05-21
申请人： Chandrakant B. Patel , Allen LeRoy Limberg
发明人： Chandrakant B. Patel , Allen LeRoy Limberg
IPC分类号： H03D1/24 , H03D5/00 , H04B1/28 , H04L1/00 , H04N5/44 , H04N5/455 , H04N5/46
CPC分类号： H04N5/4446 , H03D1/24 , H03D5/00 , H04B1/28 , H04H20/95 , H04H40/27 , H04L1/0054 , H04L27/0008 , H04L27/063 , H04L27/066 , H04L27/38 , H04L27/3827 , H04N5/4401 , H04N5/455 , H04L2027/0028 , H04L2027/0055 , H04L2027/0057 , H04L2027/0067 , H04L2027/0087 , H04L27/0012 , H04N5/46 , H04N7/08
摘要： A radio receiver uses the same tuner for receiving a selected digital television (DTV) signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal. The tuner supplies a final IF signal in a 6-MHz-wide frequency band, the lowest frequency of which is not appreciably more than 2.69 MHz. The final IF signal is digitized at a rate that is a multiple of both the symbol frequencies of the QAM and VSB signals, for synchrodyning to baseband, with the 2.69 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of the multiple of both the symbol frequencies of the QAM and VSB signals by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner.
摘要翻译：无线电接收机使用相同的调谐器来接收选择的数字电视（DTV）信号，而不管它是正交幅度调制（QAM）还是残留边带（VSB）信号。调谐器在6MHz宽的频带中提供最终的IF信号，其最低频率不大于2.69MHz。最后的IF信号以QAM和VSB信号的符号频率的倍数的数字化数字化，用于同步到基带，QAM和VSB信号的载波频率之间的2.69 MHz差异被考虑在数字同步电路。将QAM和VSB最终IF信号的载波频率通过将在数字电路中产生的自动频率和相位控制信号应用于调谐器的本地振荡器来调节为QAM和VSB信号的符号频率的倍数的分数。

15. 发明授权

US5636252A Automatic gain control of radio receiver for receiving digital high-definition television signals 失效
标题翻译：用于接收数字高清晰度电视信号的无线电接收机的自动增益控制
公开(公告)号：US5636252A
公开(公告)日：1997-06-03
申请号：US573454
申请日：1995-12-15
申请人： Chandrakant B. Patel , Allen Limberg
发明人： Chandrakant B. Patel , Allen Limberg
IPC分类号： H03D1/24 , H04L27/02 , H04N5/44 , H04N7/24 , H04L27/08
CPC分类号： H03D1/24 , H04L27/02 , H04N5/4401
摘要： Digital HDTV signals are exemplary of vestigial sideband (VSB) signals, which signals include a pilot carrier and sidebands generated in response to symbol codes descriptive of digital signals. A radio receiver for such VSB signals includes automatic gain control (AGC) circuitry that generates AGC signal by synchronously detecting the pilot carrier.
摘要翻译：数字HDTV信号是残留边带（VSB）信号的示例，该信号包括导频载波和响应于描述数字信号的符号码产生的边带。用于这种VSB信号的无线电接收机包括通过同步检测导频载波产生AGC信号的自动增益控制（AGC）电路。

16. 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。

17. 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。

18. 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。

19. 发明授权

US4694327A Digital phase locked loop stabilization circuitry using a secondary digital phase locked loop 失效
标题翻译：数字锁相环路稳定电路采用次级数字锁相环
公开(公告)号：US4694327A
公开(公告)日：1987-09-15
申请号：US845850
申请日：1986-03-28
申请人： Walter H. Demmer , Leopold A. Harwood , Chandrakant B. Patel , Alvin R. Balaban
发明人： Walter H. Demmer , Leopold A. Harwood , Chandrakant B. Patel , Alvin R. Balaban
IPC分类号： H03L7/06 , H03L7/087 , H03L7/099 , H03L7/22 , H04N9/45
CPC分类号： H04N9/45 , H03L7/0994 , H03L7/22
摘要： A digital television receiver includes a first phase locked loop which develops a sampling clock signal that is locked to the horizontal line synchronizing signal components of a composite video signal. A second digital phase locked loop is clocked by the sampling clock signal and develops a digital signal that is phase locked to the color burst signal. This digital signal is used as a regenerated color subcarrier signal to synchronously demodulate the chrominance components of the composite video signals into I and Q color difference signals. To compensate for frequency instability in the regenerated subcarrier signal caused by frequency instabilities in the line-locked clock signal, a third digital phase locked loop develops an output signal which is phase locked to a reference signal generated by a crystal controlled oscillator. Control signals from the third phase locked loop are applied to the second phase locked loop to substantially compensate for frequency instabilities in the regenerated subcarrier signal that are induced by the clock signals.
摘要翻译：数字电视接收机包括第一锁相环，其产生锁定到复合视频信号的水平线同步信号分量的采样时钟信号。第二数字锁相环由采样时钟信号计时，并产生与色同步信号锁相的数字信号。该数字信号用作再生彩色副载波信号，以将复合视频信号的色度分量同步解调为I和Q色差信号。为了补偿由线锁定时钟信号中的频率不稳定性引起的再生子载波信号中的频率不稳定性，第三数字锁相环产生锁相到由晶体振荡器产生的参考信号的输出信号。来自第三锁相环的控制信号被施加到第二锁相环，以基本上补偿由时钟信号引起的再生子载波信号中的频率不稳定性。

20. 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。

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