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1.发明授权Uniform surface acoustic wave transducer configuration having improved frequency selectivity 失效具有提高频率选择性的均匀表面声波传感器配置
公开(公告)号：US4126838A
公开(公告)日：1978-11-21
申请号：US836421
申请日：1977-09-26
CPC分类号： H04N5/4446 , H03H9/6403 , H03H9/6493
摘要： The IF portion of a television receiver includes a surface acoustic wave filter comprising at least two conductors having electrodes extending therefrom to form comb-shaped elements mounted on one surface of a piezoelectric substrate. Respective electrodes of the comb-shaped elements are interleaved in alternated relationship to form a transducer for launching an acoustic signal along the surface of the substrate in response to an electrical signal coupled between the two conductors. The overlap of each pair of alternated electrodes is substantially uniform throughout the transducer. The transducer includes two end portions and a center portion between the end portions. However, because the location of the center of each pair of alternated electrodes from the location of the center of an adjacent pair of alternated electrodes is substantially the same throughout the transducer, the transducer is continuous. The end portions are arranged with respect to the center portion to generate acoustic signals which have amplitudes less than, and desirably at least approximately equal to one-half, the amplitude of the acoustic signal generated by the center portion so as to minimize the amplitudes of undesirable sidelobes which tend to reduce the frequency selectivity of the SAW filter. In preferred embodiments, the amplitudes of components generated by the end portions are electrically adjustable to control the frequency selectivity of the SAW filter.
摘要翻译： 电视接收机的IF部分包括表面声波滤波器，其包括至少两个具有从其延伸的电极的导体，以形成安装在压电基板的一个表面上的梳状元件。 梳状元件的相应电极以交替的关系交错以形成用于响应于耦合在两个导体之间的电信号沿着衬底的表面发射声学信号的换能器。 每对交替电极的重叠在整个换能器中基本上是均匀的。 换能器包括两个端部和端部之间的中心部分。 然而，由于每对交替电极的中心的位置相对于相邻的一对交替电极的中心的位置在整个换能器中基本相同，所以换能器是连续的。 端部相对于中心部分布置以产生声振动信号，该声信号的振幅小于并且期望地至少近似等于由中心部分产生的声信号的振幅的一半，以使振幅最小化 倾向于降低SAW滤波器的频率选择性的不期望的旁瓣。 在优选实施例中，由端部产生的部件的幅度是电可调节的，以控制SAW滤波器的频率选择性。
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公开(公告)号：US4682230A
公开(公告)日：1987-07-21
申请号：US842644
申请日：1986-03-21
CPC分类号： H04N5/21 , G06T5/002 , G06T5/20 , G06T2207/20012 , G06T2207/20032
摘要： An adaptive median filter system is disclosed. Circuitry is arranged to produce successive sets of samples from an input signal which may possibly include noise. An adaptive median filter filters the samples in response to a control signal. Further circuitry estimates the relative density of the noise in the input signal to generate the control signal supplied to the adaptive median filter.
摘要翻译： 公开了一种自适应中值滤波系统。 电路布置成从可能包括噪声的输入信号产生连续的采样集。 自适应中值滤波器响应于控制信号对采样进行滤波。 另外的电路估计输入信号中的噪声的相对密度以产生提供给自适应中值滤波器的控制信号。
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3.发明授权Video/film-mode (3:2 pulldown) detector using patterns of two-field differences 失效视频/电影模式（3：2下拉）检测器使用两场差异的模式
公开(公告)号：US5317398A
公开(公告)日：1994-05-31
申请号：US930257
申请日：1992-08-17
申请人： Scott D. Casavant , Robert N. Hurst, Jr. , Stuart S. Perlman , Michael A. Isnardi , Felix Aschwanden
发明人： Scott D. Casavant , Robert N. Hurst, Jr. , Stuart S. Perlman , Michael A. Isnardi , Felix Aschwanden
CPC分类号： H04N7/0115 , H04N19/587 , H04N19/80 , H04N5/14 , H04N5/915
摘要： A film/video detector includes circuitry for generating the differences between corresponding pixel values in successive frames of video signal. These differences are accumulated over respective frame intervals. Accumulated values for respective frames are applied to a signal averager and to a correlation circuit. Average values from the averager are subtracted from correlation values from the correlation circuit, and film mode signal is indicated if the latter differences are greater than a predetermined value.
摘要翻译： 电影/视频检测器包括用于在连续的视频信号帧中产生相应像素值之间的差异的电路。 这些差异在各个帧间隔内累积。 各个帧的累积值被施加到信号平均器和相关电路。 来自平均器的平均值从相关电路的相关值中减去，如果后一个差异大于预定值，则指示胶片模式信号。
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4.发明授权
公开(公告)号：US4466015A
公开(公告)日：1984-08-14
申请号：US428591
申请日：1982-09-30
申请人： Robert A. Wargo , Stuart S. Perlman
发明人： Robert A. Wargo , Stuart S. Perlman
CPC分类号： H04N9/68
摘要： An automatic color burst magnitude control (ACC) for a digital television receiver is compatible with and is unaffected by variation of the phase of the color subcarrier signal introduced in demodulating the color subcarrier to effect control of tint. ACC is effectuated by digital gain control for scaling the digital words representing the sampled magnitudes of the color subcarrier burst signal. Quadrature demodulation of the color subcarrier signal produces color signal digital words I and Q which are each sampled and latched during the color subcarrier burst. The averages of the sampled I and Q digital words are applied as respective portions of the address of a read only memory (ROM). The ROM provides error words indicating whether the chroma burst amplitude is too large or too small. A control device responds to the error word to scale the color subcarrier digital words, and therefore scale the chroma burst amplitude to a predetermined magnitude.
摘要翻译： 用于数字电视接收机的自动色同步幅度控制（ACC）与在解调彩色副载波中引入的彩色副载波信号的相位的变化兼容并且不受影响，从而实现色调的控制。 ACC通过数字增益控制实现，用于缩放表示彩色副载波突发信号的采样幅度的数字字。 彩色副载波信号的正交解调产生在彩色副载波突发期间被采样和锁存的彩色信号数字字I和Q。 采样I和Q数字字的平均值被应用为只读存储器（ROM）的地址的相应部分。 ROM提供指示色度突发幅度是否太大或太小的错误字。 控制装置响应错误字以缩放彩色副载波数字字，并因此将色度脉冲串幅度缩放到预定的大小。
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5.发明授权
公开(公告)号：US5235417A
公开(公告)日：1993-08-10
申请号：US858057
申请日：1992-03-26
CPC分类号： H04N7/007 , H04N11/008
摘要： A television receiver processes a television signal representing a letterbox image display format with an image region, and a bar region containing "helper" information to help convert from interlaced to progressive scanning. An image signal processing path contains a motion detector and switch for determining whether a video processor receives image information (in the presence of motion), or field repeated information (in the absence of motion). Another motion detector associated with helper signal processing exhibits a narrower motion spreading characteristic than the motion detector in the image path, and determines when the helper signal is coupled to the image path.
摘要翻译： 电视接收机处理表示具有图像区域的信箱图像显示格式的电视信号，以及包含“帮助”信息的条形区域，以帮助从隔行扫描到逐行扫描。 图像信号处理路径包含运动检测器和开关，用于确定视频处理器是否接收图像信息（存在运动）或场重复信息（在不存在运动的情况下）。 与辅助信号处理相关联的另一个运动检测器与图像路径中的运动检测器相比表现出较窄的运动扩展特性，并且确定辅助信号何时耦合到图像路径。
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6.发明授权
公开(公告)号：US5225907A
公开(公告)日：1993-07-06
申请号：US857899
申请日：1992-03-26
CPC分类号： H04N7/007 , H04N11/008
摘要： A television signal receiver processes a television signal representing a letterbox image display format with a main image region, and a bar region containing auxiliary "helper" information to help convert from interlaced to progressive scanning. In the presence of image motion, a main image component and the helper component are combined and conveyed to a video processor. In the absence of motion, other image information, e.g., field repeated information, is conveyed to the video processor. The information conveyed to the video processor is determined by a switching network responsive to an control signal from a motion detector which senses low frequency luminance image information substantially exclusive of high frequency image information.
摘要翻译： 电视信号接收机处理表示具有主图像区域的信箱图像显示格式的电视信号和包含辅助“辅助”信息的条形区域，以帮助从隔行扫描到逐行扫描。 在存在图像运动的情况下，将主图像分量和辅助分量组合并传送到视频处理器。 在没有运动的情况下，将其它图像信息，例如场重复信息传送到视频处理器。 传送到视频处理器的信息由响应来自运动检测器的控制信号的开关网络确定，运动检测器感测基本上不包括高频图像信息的低频亮度图像信息。
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公开(公告)号：US4961108A
公开(公告)日：1990-10-02
申请号：US261522
申请日：1988-10-24
申请人： Stuart S. Perlman
发明人： Stuart S. Perlman
IPC分类号： H04N9/78
CPC分类号： H04N9/78
摘要： Comb filter apparatus for comb filtering NTSC or PAL video signals includes sampling circuitry to sample the video signal at 45 degrees relative to the I,Q or U,V axes. The sampled signal is coupled to delay circuitry arranged to concurrently provide video samples from three successive horizontal lines, designated top, middle and bottom. The video samples from the middle line are combined with samples alternately selected from the top and bottom lines to provide a comb filtered signal.
摘要翻译： 用于梳状滤波NTSC或PAL视频信号的梳状滤波器装置包括采样电路，以相对于I，Q或U，V轴以45度采样视频信号。 采样信号被耦合到延迟电路，该延迟电路被布置成同时提供来自三个连续的水平线的视频样本，其指定为顶部，中间和底部。 来自中间线的视频样本与从顶部和底部交替选择的样本组合以提供梳状滤波信号。
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8.发明授权
公开(公告)号：US5384599A
公开(公告)日：1995-01-24
申请号：US839651
申请日：1992-02-21
CPC分类号： H04N7/007
摘要： A television signal receiver processes a television signal representing a letterbox image display format with a main image region, and a bar region containing auxiliary information to help convert from interlaced to progressive scanning. The auxiliary information is processed in a signal path including a nonlinear amplitude expander and apparatus for modifying the operation of the signal path as a function of the noise content of the television signal.
摘要翻译： 电视信号接收机处理表示具有主图像区域的信箱图像显示格式的电视信号，以及包含辅助信息的条形区域，以帮助从隔行扫描到逐行扫描。 辅助信息在包括非线性幅度扩展器的信号路径和用于根据电视信号的噪声含量的函数修改信号路径的操作的装置进行处理。
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公开(公告)号：US5016092A
公开(公告)日：1991-05-14
申请号：US592397
申请日：1990-10-03
申请人： Stuart S. Perlman
发明人： Stuart S. Perlman
摘要： A multimode comb filter for comb filtering, e.g., NTSC and/or PAL video signals includes delay means for concurrently providing video signals representing first, second and third adjacent horizontal lines. First and second combining means coupled to the delay means provide alternate 1-H comb filtered signals in both the NTSC and PAL modes. Control circuitry coupled to the delay means generates a control signal for adaptively selecting the one of the alternate 1-H comb filtered signals or appropriate proportions of both alternate 1-H comb filtered signals to form an output comb filtered signal. In the NTSC mode the control circuitry generates the control signal from sums of vertically aligned pairs of samples from said first and second lines and from said second and third lines. In the PAL mode the control signal is generated from alternating sums and differences of vertically aligned pairs of samples from said first and second lines and from said second and third lines.
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公开(公告)号：US5005074A
公开(公告)日：1991-04-02
申请号：US437952
申请日：1989-11-17
申请人： Stuart S. Perlman
发明人： Stuart S. Perlman
CPC分类号： H04N9/78
摘要： A multimode comb filter for comb filtering, e.g., NTSC and/or PAL video signals includes delay means for concurrently providing video signals representing three adjacent horizontal lines. First and second combining means coupled to the delay means provide alternate 1-H comb filter signals in both the NTSC and PAL modes. Control circuitry coupled to the delay means generates a control signal for adaptively selecting the one of the alternate 1-H comb filtered signals or appropriate proportions of both alternate 1-H comb filtered signals to form an output comb filtered signal.
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