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公开(公告)号：US08355469B2
公开(公告)日：2013-01-15
申请号：US13178803
申请日：2011-07-08
申请人： Daniel G. Baker , Barry A. McKibben , Michael D. Nakamura , Evan Albright , Scott E. Zink , Michael S. Overton
发明人： Daniel G. Baker , Barry A. McKibben , Michael D. Nakamura , Evan Albright , Scott E. Zink , Michael S. Overton
CPC分类号： H04L1/205 , G01R13/0254 , G01R31/31711 , G01R31/31725 , G01R31/31727
摘要： A flexible timebase for eye diagrams uses a stable free running oscillator as a sample clock for equivalent time sampling of an input serial digital signal and of a reference signal, derived from a subdivided recovered clock of the input serial digital signal. The reference signal samples are provided to a digital phase-locked loop that provides the flexible timebase to an eye pattern generator. The eye pattern generator accumulates the input serial digital signal samples at times corresponding to the reference signal samples to produce the eye diagram. A linear phase detector in the digital phase locked loop converts the reference signal samples to a complex signal using a Hilbert transform and then to a linear ramp of phase values using a CORDIC algorithm with arctangent lookup table. A subtractor then subtracts the digital phase-locked loop feedback from the linear ramp to provide the input to the loop filter.
摘要翻译： 眼图的灵活时基使用稳定的自由运行振荡器作为采样时钟，用于输入串行数字信号和从输入串行数字信号的细分恢复时钟导出的参考信号的等效时间采样。 将参考信号样本提供给数字锁相环，其向眼图发生器提供灵活的时基。 眼图发生器在对应于参考信号样本的时间累积输入的串行数字信号样本以产生眼图。 数字锁相环中的线性相位检测器使用希尔伯特变换将参考信号样本转换为复信号，然后使用具有反正切查找表的CORDIC算法将其转换为相位值的线性斜坡。 减法器然后从线性斜坡减去数字锁相环反馈，以将输入提供给环路滤波器。
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公开(公告)号：US08184747B2
公开(公告)日：2012-05-22
申请号：US11274687
申请日：2005-11-14
申请人： Daniel G. Baker , Barry A. McKibben , Michael D. Nakamura , Evan Albright , Scott E. Zink , Michael S. Overton
发明人： Daniel G. Baker , Barry A. McKibben , Michael D. Nakamura , Evan Albright , Scott E. Zink , Michael S. Overton
CPC分类号： H04L1/205 , G01R13/0254 , G01R31/31711 , G01R31/31725 , G01R31/31727
摘要： A flexible timebase for eye diagrams uses a stable free running oscillator as a sample clock for equivalent time sampling of an input serial digital signal and of a reference signal derived from a subdivided recovered clock of the input serial digital signal. The reference signal samples are provided to a digital phase-locked loop that provides the flexible timebase to an eye pattern generator. The eye pattern generator accumulates the input serial digital signal samples at times corresponding to the reference signal samples to produce the eye diagram. A linear phase detector in the digital phase locked loop converts the reference signal samples to a complex signal using a Hilbert transform and then to a linear ramp of phase values using a CORDIC algorithm with arctangent lookup table. The digital phase-locked loop feedback is subtracted from the linear ramp to provide the input to the loop filter.
摘要翻译： 眼图的灵活时基使用稳定的自由运行振荡器作为采样时钟，用于输入串行数字信号的等效时间采样和从输入串行数字信号的细分恢复时钟导出的参考信号。 将参考信号样本提供给数字锁相环，其向眼图发生器提供灵活的时基。 眼图发生器在对应于参考信号样本的时间累积输入的串行数字信号样本以产生眼图。 数字锁相环中的线性相位检测器使用希尔伯特变换将参考信号样本转换为复信号，然后使用具有反正切查找表的CORDIC算法将其转换为相位值的线性斜坡。 从线性斜坡中减去数字锁相环反馈，为环路滤波器提供输入。
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公开(公告)号：US07268783B2
公开(公告)日：2007-09-11
申请号：US09992060
申请日：2001-11-21
申请人： Robert W. Parish , Scott E. Zink , Evan Albright
发明人： Robert W. Parish , Scott E. Zink , Evan Albright
IPC分类号： G06T11/20
CPC分类号： G09G5/20 , G06T5/002 , G06T5/20 , G06T2200/12
摘要： Image alias rejection when converting a high resolution rasterized waveform to a lower resolution rasterized waveform for display uses a statistical filter. The statistical filter provides a shaped probability density function either by combining the outputs of multiple random number generators, such as linear feedback shift registers, or by using a corresponding look-up table to produce a dither signal. The statistical filter may be applied to one or both of the dimensional values for each data point of the high resolution rasterized waveform by combining the dimensional values with the dither signal. The resulting filtered dimensional values may then be subsampled, such as by truncation, to produce values for a lower resolution rasterized waveform display.
摘要翻译： 将高分辨率光栅波形转换为较低分辨率的光栅波形以进行显示时，图像别名拒绝使用统计滤波器。 统计滤波器通过组合多个随机数发生器的输出（诸如线性反馈移位寄存器）或通过使用相应的查找表来产生抖动信号来提供成形的概率密度函数。 统计滤波器可以通过将尺寸值与抖动信号组合来应用于高分辨率光栅化波形的每个数据点的一个或两个维度值。 然后可以例如通过截断对所得滤波的维数值进行二次采样，以产生较低分辨率光栅化波形显示的值。
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公开(公告)号：US5488310A
公开(公告)日：1996-01-30
申请号：US294274
申请日：1994-08-22
申请人： Daniel G. Baker , Robert W. Parish , Scott E. Zink
发明人： Daniel G. Baker , Robert W. Parish , Scott E. Zink
摘要： A return-loss detector for a serial digital signal source uses a return-loss bridge circuit to exploit the broadband spectral characteristics of a serial digital signal from the signal source to monitor the termination conditions of a system being driven. A differential pair of serial digital signals from the source are input to the bridge circuit having a reference termination in one leg and the system termination in the other. A broadband detector is used at the output of the bridge circuit to generate an error signal, which is measured by a detector or metering circuit. The measured signal may be displayed as a value in dB or may be input to a comparator to provide an alarm or warning signal to an operator.
摘要翻译： 用于串行数字信号源的回波损耗检测器使用回波损耗桥接电路来利用来自信号源的串行数字信号的宽带频谱特性来监视被驱动的系统的终止条件。 来自源的差分对的串行数字信号被输入到具有一条支路中的参考端接和另一条中的系统端接的桥式电路。 在桥接电路的输出端使用宽带检测器来产生由检测器或计量电路测量的误差信号。 测量的信号可以以dB表示，或者可以输入到比较器，以向操作者提供警报或警告信号。
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公开(公告)号：US06246439B1
公开(公告)日：2001-06-12
申请号：US09527796
申请日：2000-03-17
申请人： Scott E. Zink , Daniel G. Baker
发明人： Scott E. Zink , Daniel G. Baker
IPC分类号： H04N708
CPC分类号： H04J13/00 , H04J13/0077 , H04L5/04 , H04N7/24
摘要： A method and apparatus for transparently embedding data into a video signal modulates a particular carrier frequency with a randomized pattern representing the data. The randomized pattern may be a combination of the data with the output from a pseudo-random binary sequence generator, or the data may be converted first into a bi-orthogonal pattern selected from among a plurality of such patterns and then randomized. The resulting modulated carrier frequency is then amplitude modulated based upon a human visual model so that the modulated carrier frequency amplitude is greater in areas of high image complexity and lower in areas of low image complexity. The subliminal data represented by the modulated carrier frequency is added to the video signal. At a decoder the data is recovered using appropriate correlation techniques by first filtering the video signal to increase the subliminal data component relative to the image component, then demodulating the data component to produce the data pattern, and then correlating the data pattern with the possible data patterns to identify the particular pattern and associated data word.
摘要翻译： 用于将数据透明地嵌入到视频信号中的方法和装置利用表示数据的随机化模式来调制特定载波频率。 随机化模式可以是数据与来自伪随机二进制序列生成器的输出的组合，或者可以将数据首先转换为从多个这样的模式中选择的双正交模式，然后随机化。 然后，所得到的调制载波频率基于人类视觉模型进行幅度调制，使得调制载波频率振幅在高图像复杂度的区域中较大，而在低图像复杂度的区域中较低。 由调制载波频率表示的临界数据被加到视频信号中。 在解码器处，使用适当的相关技术来恢复数据，首先对视频信号进行滤波以相对于图像分量增加潜意识数据分量，然后解调数据分量以产生数据模式，然后将数据模式与可能的数据相关联 用于识别特定模式和相关数据字的模式。
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公开(公告)号：US06211919B1
公开(公告)日：2001-04-03
申请号：US08829524
申请日：1997-03-28
申请人： Scott E. Zink , Daniel G. Baker
发明人： Scott E. Zink , Daniel G. Baker
IPC分类号： H04N708
CPC分类号： H04J13/00 , H04J13/0077 , H04L5/04 , H04N7/24
摘要： A method and apparatus for transparently embedding data into a video signal modulates a particular carrier frequency with a randomized pattern representing the data. The randomized pattern may be a combination of the data with the output from a pseudo-random binary sequence generator, or the data may be converted first into a bi-orthogonal pattern selected from among a plurality of such patterns and then randomized. The resulting modulated carrier frequency is then amplitude modulated based upon a human visual model so that the modulated carrier frequency amplitude is greater in areas of high image complexity and lower in areas of low image complexity. The subliminal data represented by the modulated carrier frequency is added to the video signal. At a decoder the data is recovered using appropriate correlation techniques by first filtering the video signal to increase the subliminal data component relative to the image component, then demodulating the data component to produce the data pattern, and then correlating the data pattern with the possible data patterns to identify the particular pattern and associated data word.
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公开(公告)号：US06924834B2
公开(公告)日：2005-08-02
申请号：US10124015
申请日：2002-04-16
申请人： David C. Woody, Jr. , Scott E. Zink
发明人： David C. Woody, Jr. , Scott E. Zink
CPC分类号： H04N17/00 , H04N5/46 , H04N21/44209
摘要： An instrument has a single video input port for receiving either analog or serial digital video signals coupled to both an analog and a serial digital video input path. The outputs of the analog and serial digital video input paths are provided as respective inputs to a video switch, the output of which is then provided to the instrument for further processing. Information from the serial digital video input path, which may include clock recovery lock, carrier detect and/or video standard, is provided to a decision module that generates a select signal for the video switch. As an example, if “lock” is present, then the output from the serial digital video input path is selected automatically for output by the video switch, otherwise the output from the analog video input path is selected automatically. The automatic selection for the switch may be manually overridden. A text display is provided to indicate which video input path the instrument is processing according to the output from the video switch, as well as information about the video signal at the video input port.
摘要翻译： 仪器具有单个视频输入端口，用于接收耦合到模拟和串行数字视频输入路径的模拟或串行数字视频信号。 模拟和串行数字视频输入路径的输出被提供给视频开关的相应输入，然后将其输出提供给仪器进行进一步处理。 来自可以包括时钟恢复锁定，载波检测和/或视频标准的串行数字视频输入路径的信息被提供给产生视频开关的选择信号的决策模块。 例如，如果存在“锁定”，则自动选择来自串行数字视频输入路径的输出以供视频开关输出，否则自动选择来自模拟视频输入路径的输出。 可以手动覆盖交换机的自动选择。 提供文本显示器，以根据视频开关的输出以及视频输入端口上的视频信号的信息来指示仪器正在处理哪个视频输入路径。
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公开(公告)号：US4757538A
公开(公告)日：1988-07-12
申请号：US882753
申请日：1986-07-07
申请人： Scott E. Zink
发明人： Scott E. Zink
CPC分类号： H04N5/607
摘要： A stereo signal separation system for separating the L+R and L-R components of a BTSC stereo signal mixes the BTSC signal with a multiple of the pilot frequency. To recover the L+R component the mixer output is combined with the input BTSC signal, and to recover to L-R component the mixer output is combined with a second mixer output shifted ninety degrees. The combined output is low pass filtered to recover the desired component.
摘要翻译： 用于分离BTSC立体声信号的L + R和L-R分量的立体声信号分离系统将BTSC信号与导频频率的倍数进行混合。 为了恢复L + R分量，混频器输出与输入的BTSC信号相结合，并恢复到L-R分量，混频器输出与偏移90度的第二个混频器输出相结合。 组合输出被低通滤波以恢复所需的组件。
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