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1. 发明授权

US5500739A Frequency-multiplexing FM luma signal with color and 2nd under signals having overlapping frequency spectra 失效
标题翻译：频率复用具有颜色的FM亮度信号和具有重叠频谱的信号
公开(公告)号：US5500739A
公开(公告)日：1996-03-19
申请号：US59765
申请日：1993-05-11
申请人： Christopher H. Strolle , Chandrakant B. Patel , Werner F. Wedam , Raymond Schnitzler , Hermann J. Weckenbrock , Jung-Wan Ko , Jong-Kwung Yun , Allen L. Limberg
发明人： Christopher H. Strolle , Chandrakant B. Patel , Werner F. Wedam , Raymond Schnitzler , Hermann J. Weckenbrock , Jung-Wan Ko , Jong-Kwung Yun , Allen L. Limberg
IPC分类号： H04N9/80 , H04N9/82 , H04N9/835 , H04N9/79
CPC分类号： H04N9/835 , H04N9/80 , H04N9/8205
摘要： A frequency-multiplexed video signal is generated in which a color-under signal and a second under signal are linearly combined with at least partially overlapping frequency spectra to form a composite under signal for an FM luma signal. The frequency-multiplexed video signal is suited for recording on magnetic tape using helical scanning methods and for being played back from the magnetic tape using helical scanning methods. The second under signal is generated in such way that line-comb filtering can be used during playback to separate color-under signal and second under signal each from the composite signal despite their frequency spectra being at least partially overlapping in the composite signal.
摘要翻译：产生频率复用的视频信号，其中彩色信号和第二下信号与至少部分重叠的频谱线性组合以形成用于FM亮度信号的复合信号。频率复用视频信号适用于使用螺旋扫描方法在磁带上进行记录，并且使用螺旋扫描方法从磁带重放。第二下信号被生成为使得在重放期间可以使用线梳滤波来分离彩色信号和第二下信号，每个来自复合信号，尽管它们的频谱在复合信号中至少部分重叠。

2. 发明授权

US5596418A Deemphasis and subsequent reemphasis of high-energy reversed-spectrum components of a folded video signal 失效
标题翻译：折叠视频信号的高能量反向分量的强调和随后的重新加权
公开(公告)号：US5596418A
公开(公告)日：1997-01-21
申请号：US478766
申请日：1995-06-07
申请人： Christopher H. Strolle , Allen L. Limberg , Werner F. Wedam , Raymond Schnitzler , Hermann J. Weckenbrock , Jung W. Ko , Jong K. Yun
发明人： Christopher H. Strolle , Allen L. Limberg , Werner F. Wedam , Raymond Schnitzler , Hermann J. Weckenbrock , Jung W. Ko , Jong K. Yun
IPC分类号： H04N5/923 , H04N9/797 , H04N9/80 , H04N9/82 , H04N9/898 , H04N9/79
CPC分类号： H04N5/923 , H04N9/7976 , H04N9/80 , H04N9/8205 , H04N9/898
摘要： A system for reproducing a luminance signal from a medium containing a previously recorded luminance signal with a high-frequency portion thereof compressed in dynamic range includes a circuit for recovering that luminance signal from the medium. Filtering is done to separate the low-frequency and compressed-in-dynamic-range high-frequency portions of the recovered luminance signal from each other. A corer responds to the separated compressed-in-dynamic-range high-frequency portion of the recovered luminance signal to provide a cored high-frequency portion with expanded dynamic range and reduced noise. The level of the cored high-frequency portion with expanded dynamic range and reduced noise is then boosted by a predetermined amount to compensate for energy losses during the compression of the dynamic range and added back to the low-frequency portion of the recovered luminance signal to reproduce a full-band luminance signal with at least partially restored dynamic range for high-frequencies and without readily visible high-frequency noise.
摘要翻译：一种用于从包含先前记录的亮度信号的介质再现亮度信号的系统，其中其高频部分在动态范围内被压缩，包括用于从介质中恢复该亮度信号的电路。完成滤波以将恢复的亮度信号的低频和压缩在动态范围的高频部分彼此分离。核心部分对恢复的亮度信号的分离压缩在动态范围高频部分进行响应，以提供具有扩展的动态范围和降低的噪声的核心高频部分。然后将具有扩大的动态范围和降低的噪声的核心高频部分的电平提升预定量，以补偿在动态范围的压缩期间的能量损失，并将其恢复到恢复的亮度信号的低频部分，再现具有用于高频的至少部分恢复的动态范围的全频带亮度信号，并且没有容易看到的高频噪声。

3. 发明授权

US5548617A Digital VSB detector with bandpass phase tracker using rader filters, as for use in an HDTV receiver 失效
标题翻译：数字VSB检测器，带有使用雷达滤波器的带通相位跟踪器，用于HDTV接收机
公开(公告)号：US5548617A
公开(公告)日：1996-08-20
申请号：US243480
申请日：1994-05-19
申请人： Chandrakant B. Patel , Allen L. Limberg
发明人： Chandrakant B. Patel , Allen L. Limberg
IPC分类号： H04L27/38 , H04N5/44 , H04N5/455 , H04N5/50 , H04N7/015 , H04L27/06 , H03K1/00
CPC分类号： H04N5/4401 , H04L27/3836 , H04N5/455 , H04N5/50
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 pair of all-pass digital filters, which exhibit a constant .pi./2 difference in phase response for the digitized bandpass signals and are designed based on Jacobian elliptic functions as described by C. M. Rader, are used in the phase tracker for generating the real and imaginary portions of the digitized final intermediate-frequency signal.
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，或者在频率期间使用的局部振荡中的相位不相干性转换。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对于数字化带通信号，其相位响应表现出常数pi / 2的全波数字滤波器的载波对，并且基于由CM Rader描述的雅可比椭圆函数设计，用于相位跟踪器中以产生真实的和数字化的最终中频信号的虚部。

4. 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。

5. 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。

6. 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。

7. 发明授权

US07038732B1 DTV signal with GCR components in plural-data-segment frame headers and receiver apparatus for such signal 失效
标题翻译：具有多数据段帧头中的GCR分量的DTV信号和用于这种信号的接收机装置
公开(公告)号：US07038732B1
公开(公告)日：2006-05-02
申请号：US09700448
申请日：1999-05-11
申请人： Allen L. Limberg , Chandrakant B. Patel
发明人： Allen L. Limberg , Chandrakant B. Patel
IPC分类号： H04N7/24
CPC分类号： H04N5/211 , H04L1/0045 , H04L1/0057 , H04L1/006 , H04L1/0065 , H04N5/4401
摘要： A DTV signal has a plural-data-segment frame header including complementary first and second ghost-cancellation reference signals differentially delayed by the duration of two NTSC horizontal scan lines. A receiver for such DTV signal has an adaptive equalizer for baseband symbol code with kernel weights calculated by a computer operative on the equalizer response after comb filtering. The comb filter combines the equalizer response as differentially delayed by the duration of two NTSC horizontal scan lines to cancel artifacts of co-channel NTSC interference in the comb filtered equalizer response supplied to the computer. This reduces the undesirable influence of such artifacts on equalization to reduce intersymbol interference.
摘要翻译： DTV信号具有包含互补的第一和第二重影消除参考信号的多数据段帧头，差分延迟两个NTSC水平扫描线的持续时间。用于这种DTV信号的接收机具有用于基带符号代码的自适应均衡器，其中核心权重由梳理滤波之后的均衡器响应上操作的计算机计算。梳状滤波器将均衡器响应差分延迟了两个NTSC水平扫描线的持续时间，以消除提供给计算机的梳状滤波均衡器响应中的同频道NTSC干扰的伪像。这减少了这种伪影对均衡的不期望的影响，以减少符号间干扰。

8. 发明授权

US5461426A Apparatus for processing modified NTSC television signals, with digital signals buried therewithin 失效
标题翻译：用于处理修改后的NTSC电视信号的装置，其中埋有数字信号
公开(公告)号：US5461426A
公开(公告)日：1995-10-24
申请号：US108311
申请日：1993-08-20
申请人： Allen L. Limberg , Chandrakant B. Patel , Tianmin Liu
发明人： Allen L. Limberg , Chandrakant B. Patel , Tianmin Liu
IPC分类号： H04N5/21 , H04N7/04 , H04N7/081 , H04N11/24 , H04N7/08
CPC分类号： H04N7/081 , H04N11/008 , H04N5/211 , H04N7/04
摘要： A relatively low power phase-shift-keyed (PSK) subcarrier encoding digital information is admixed with composite video signal. The PSK subcarrier is at an odd multiple of half the scan line frequency of the composite video signal, and the symbol rate is at a multiple of the scan line frequency. The PSK subcarrier modulates the amplitude of a suppressed carrier which is the same frequency as the video carrier for the composite video signal and preferably is in quadrature phasing therewith. To reduce evidence of the PSK subcarrier in television picture generated from that composite video signal, the PSK subcarrier is interrupted after each of periods of one frame duration and repeated in anti-phase during the next period of one frame duration. This also provides a basis for separating the PSK subcarrier from static luminance signal components by bandpass frame-comb filtering. Preferably, in the scan lines of consecutive pairs of scan lines, the PSK subcarrier is repeated with phase reversal of the subcarrier between scan lines, and the chroma subcarrier is repeated. This provides a basis for separating PSK subcarrier from chroma subcarrier by lowpass line-comb filtering.
摘要翻译：将相对较低功率的相移键控（PSK）副载波编码数字信息与复合视频信号相混合。 PSK副载波为复合视频信号的扫描线频率的一半的奇数倍，符号率为扫描线频率的倍数。 PSK副载波调制与复合视频信号的视频载波相同的频率的抑制载波的振幅，并且优选与其正交相位调制。为了减少从该复合视频信号产生的电视图像中的PSK副载波的证据，PSK副载波在一个帧持续时间的每个周期之后被中断，并且在一个帧持续时间的下一个周期内被反相重复。这还提供了通过带通帧梳状滤波将PSK副载波与静态亮度信号分量分离的基础。优选地，在连续的扫描线对的扫描线中，通过扫描线之间的副载波的相位反复来重复PSK子载波，并且重复色度副载波。这为通过低通线梳梳滤波分离PSK副载波与色副载波提供了基础。

9. 发明授权

US5555024A Transmitters for burying digital signals within the trace and retrace intervals of NTSC television signals 失效
标题翻译：用于在NTSC电视信号的跟踪和回扫间隔内埋入数字信号的发射机
公开(公告)号：US5555024A
公开(公告)日：1996-09-10
申请号：US524488
申请日：1995-09-07
申请人： Allen L. Limberg
发明人： Allen L. Limberg
IPC分类号： H04H20/31 , H04N7/08
CPC分类号： H04N7/0803 , H04H20/31 , H04N7/08
摘要： An NTSC television signal transmitter also transmits through the same transmission channel a suppressed data carrier having a frequency differing from that of video carrier, having a symbol rate that is a multiple of horizontal scanning rate of video signal, having data frames occurring at a data frame rate that is the same as the video frame rate, and transmitting the symbols transmitted in each of alternate data frames in opposite phase during the next data frame. The data carrier has no image on the other side of the video carrier and preferably its modulation spectrum overlaps the video carrier. A digital-signal receiver can recover data from such a data carrier buried in an NTSC television signal, using frame-comb filtering to separate data from interfering video signal.
摘要翻译： NTSC电视信号发射机还通过相同的传输信道发送具有与视频载波频率不同的频率的抑制数据载波，其具有作为数据帧出现的数据帧的视频信号的水平扫描速率的倍数的符号率速率与视频帧速率相同，并且在下一个数据帧期间以相反的相位发送在每个替代数据帧中发送的符号。数据载体在视频载体的另一侧没有图像，并且优选地其调制频谱与视频载体重叠。数字信号接收机可以使用帧梳状滤波从埋藏在NTSC电视信号中的数据载体恢复数据，以将数据与干扰视频信号分开。

10. 发明授权

US4420726A Voltage-followers with low offset voltages 失效
标题翻译：具有低失调电压的电压跟随器
公开(公告)号：US4420726A
公开(公告)日：1983-12-13
申请号：US271026
申请日：1981-06-04
申请人： Allen L. Limberg
发明人： Allen L. Limberg
IPC分类号： H03F3/50 , H03F3/16
CPC分类号： H03F3/505
摘要： First and second transistors of first and second types that can exhibit respective first and second potentials of first and second opposite polarities between their respective input and common electrodes when respective currents flow in conduction paths between their respective output and common electrodes. The transistors are connected in cascade with the input electrode of the first transistor connected to an input point, the common electrode of the first transistor connected to the input electrode of the second, and the conduction path of the second transistor coupled to a load. A circuit for operating the first transistor at the first potential to compensate, at least in part, for the second potential comprises a third transistor of the first type to which is applied a potential of the first polarity between its input and common electrodes to establish a current in its conduction path. A current directly related to the current in the conduction path of the third transistor is applied to the common electrode of the second transistor as substantially the entire current flow in its conduction path.
摘要翻译：第一和第二类型的第一和第二晶体管，当各自的电流在它们各自的输出端和公共电极之间的导通路径中流动时，它们可以在它们各自的输入端和公共电极之间呈现相应的第一和第二相反极性的第一和第二电位的第一和第二电极。晶体管与连接到输入点的第一晶体管的输入电极级联连接，第一晶体管的公共电极连接到第二晶体管的输入电极，第二晶体管的导通路连接到负载。用于操作第一电位的第一晶体管至少部分地用于第二电位的电路包括第一类型的第三晶体管，其在其输入端和公共电极之间施加第一极性的电位，以建立第电流在其传导路径。与第三晶体管的导通路径中的电流直接相关的电流作为基本上在其导通路径中的整个电流流动被施加到第二晶体管的公共电极。

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