专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US4748667A Jamming signal scrambling and descrambling systems for CATV 失效
标题翻译：用于CATV的干扰信号加扰和解扰系统
公开(公告)号：US4748667A
公开(公告)日：1988-05-31
申请号：US926749
申请日：1986-11-04
申请人： James O. Farmer , Anatoly Kozushin , Herman A. Kruse , William P. LaFay , Christopher P. Lewis , Frank R. Little, Jr. , Leo Montreuil , Leo J. Thompson , Lamar E. West, Jr. , Joseph G. Mobley, II
发明人： James O. Farmer , Anatoly Kozushin , Herman A. Kruse , William P. LaFay , Christopher P. Lewis , Frank R. Little, Jr. , Leo Montreuil , Leo J. Thompson , Lamar E. West, Jr. , Joseph G. Mobley, II
IPC分类号： H04N7/16 , H04N7/167 , H03H7/00
CPC分类号： H04K3/825 , H04K3/42 , H04N7/166 , H04K2203/14 , H04K3/43
摘要： Scrambling and descrambling systems utilizing jamming signals provide improved pictures with minimal distortion due to ghosts and artifacts. The television signal is combined with a jamming signal or signals located preferably in the vestigial sideband (VSB) of the modulated picture carrier and at about a null in the spectrum of the modulation of the picture carrier by the horizontal sync. The jamming signal or signals also preferably are placed between the harmonic components of the horizontal sync which define the horizontal sync spectrum and at frequencies which comply with governmental regulations respecting frequency locations of strong signals of CATV purposes. The jamming signals are generated by phase locking to the horizontal sync signals of the television signals or to a submultiple of the horizontal sync frequency. Artifacts are further reduced by preemphasis of the transmitted television signal in the sideband opposite to that in which the jamming signal or signals are located and spaced by an equal frequency increment from the location of the jamming signal energy. In order to extract the jamming signal, so as to descramble the television signal for reproduction in the subscriber's television receiver, a network including at least one surface acoustic wave (SAW) resonator device is embedded in an all-pass network which allows essentially lossless transmission of the television signal spectrum, except for the jamming signal energy and enables that energy to be located close to (e.g., approximately 228 KHz) from the picture carrier in the VSB for enhanced security.
摘要翻译：使用干扰信号的加扰和解扰系统由于鬼影和伪像而提供了具有最小失真的改进图像。电视信号与优选地位于调制图像载体的残留边带（VSB）中的干扰信号或信号组合，并且在水平同步的图像载波的调制频谱中约为零。干扰信号或信号还优选地被放置在水平同步的谐波分量之间，其定义了水平同步频谱，并且频率符合有关CATV目的的强信号的频率位置的政府规定。干扰信号通过相位锁定到电视信号的水平同步信号或水平同步频率的亚数来产生。通过在与干扰信号或信号所在的边带相反的边带中预先强调发送的电视信号并且从干扰信号能量的位置间隔相等的频率增量来进一步减少伪影。为了提取干扰信号，为了解扰电视信号以在用户的电视接收机中进行再现，包括至少一个表面声波（SAW）谐振器装置的网络被嵌入在全通网络中，其允许基本上无损耗的传输的电视信号频谱，除了干扰信号能量，并使能量位于VSB中的图像载体附近（例如，大约228KHz），以增强安全性。

2. 发明授权

US4584599A Signal to noise ratio enhancement using baseband signals in an FM television system 失效
公开(公告)号：US4584599A
公开(公告)日：1986-04-22
申请号：US683680
申请日：1984-12-19
申请人： Joseph G. Mobley, II
发明人： Joseph G. Mobley, II
IPC分类号： H04N5/21 , H03H17/00 , H03H21/00 , H04N7/045 , H04N7/20 , H04N9/64 , H04N9/77 , H04N11/08 , H04N11/14 , H04N5/44
CPC分类号： H04N9/646 , H04N11/08 , H04N11/146 , H04N7/045
摘要： In an FM television signal angle modulated with luminance and chrominance information, there exists a high degree of correlation between picture elements occurring one line period apart. In an effort to steer the pass band of a tunable bandpass filter to the instantaneous frequency of the incoming television signal, a steering signal is developed which utilizes this high degree of correlation. For NTSC systems, luminance information is delayed by one-line period (63.5 us in the U.S.A.) and combined with suitable delayed chrominance information to form the filter's steering signal. For MAC systems, one-line delayed luminance and two-line delayed chrominance information are alternately applied to the filter as its steering signal. By steering the pass band of the filter to the incoming signal, maximum signal will be captured with minimum noise, enhancing the signal-to-noise ratio of a color television system.

3. 发明授权

US4641181A Signal to noise ratio enhancement using baseband signals in an FM television system 失效
标题翻译：在FM电视系统中使用基带信号的信噪比增强
公开(公告)号：US4641181A
公开(公告)日：1987-02-03
申请号：US831516
申请日：1986-02-21
申请人： Joseph G. Mobley, II
发明人： Joseph G. Mobley, II
IPC分类号： H04N7/045 , H04N9/64 , H04N11/08 , H04N11/14 , H04N5/44
CPC分类号： H04N11/146 , H04N11/08 , H04N7/045 , H04N9/646
摘要： In an FM television signal angle modulated with luminance and chrominance information, there exists a high degree of correlation between picture elements occurring one line period apart. In an effort to steer the pass band of a tunable bandpass filter to the instantaneous frequency of the incoming television signal, a steering signal is developed which utilizes this high degree of correlation. For NTSC systems, luminance information is delayed by one-line period (63.5 .mu.s in the U.S.A.) and combined with suitably delayed chrominance information to form the filter's steering signal. For MAC systems, one-line delayed luminance and two-line delayed chrominance information are alternately applied to the filter as its steering signal. By steering the pass band of the filter to the incoming signal, maximum signal will be captured with minimum noise, enhancing the signal-to-noise ratio of a color television system.
摘要翻译：在利用亮度和色度信息调制的FM电视信号角度中，在一行间隔出现的像素之间存在高度的相关性。为了将可调带通滤波器的通带引导到输入电视信号的瞬时频率，开发了利用这种高度相关性的转向信号。对于NTSC系统，亮度信息被延迟一行周期（美国63.5μs），并结合适当延迟的色度信息以形成滤波器的转向信号。对于MAC系统，将一行延迟亮度和双线延迟色度信息交替地施加到滤波器作为其转向信号。通过将滤波器的通带转换为输入信号，将以最小的噪声捕获最大信号，从而提高彩色电视系统的信噪比。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式