公开(公告)号：US06490010B1

公开(公告)日：2002-12-03

申请号：US09308263

申请日：1999-05-14

申请人： Kazuhiko Shibuya ,  Junji Kumada ,  Yuichi Iwadate ,  Hiroyuki Hamazumi ,  Toshihiro Nomoto ,  Kouichi Takano ,  Tomohiro Saito ,  Shoji Tanaka ,  Fumiaki Minematsu ,  Akinori Hashimoto ,  Shigeyuki Itoh ,  Hajime Matsumura ,  Hisakazu Katoh ,  Masaru Takechi

发明人： Kazuhiko Shibuya ,  Junji Kumada ,  Yuichi Iwadate ,  Hiroyuki Hamazumi ,  Toshihiro Nomoto ,  Kouichi Takano ,  Tomohiro Saito ,  Shoji Tanaka ,  Fumiaki Minematsu ,  Akinori Hashimoto ,  Shigeyuki Itoh ,  Hajime Matsumura ,  Hisakazu Katoh ,  Masaru Takechi

IPC分类号： H04N550

CPC分类号： H03J7/02 ,  H04L27/22 ,  H04L2027/0057 ,  H04N5/4401 ,  H04N5/455 ,  H04N5/50

摘要： Stabilized carrier recovery is achieved even at the time of a low C/N ratio by measuring the phase of a signal and controlling VCO or NCO (Numerical Controlled Oscillator) using only a period having few constellation points. At this time, false lock phenomenon is avoided as follows. That is, relatively short SYNC modulated by an already-known pattern is entered into a modulation wave, VCO or NCO oscillation frequency is swept in a wide range and sweep is stopped at a frequency in which the SYNC can be received, thereby carrying out coarse control AFC. Further, a period having long to some extent, having few constellation points is provided in the modulation wave and then, a difference between the frequency of a received modulated signal and a local oscillation signal of VCO or NCO is obtained in this period. This frequency difference is analyzed according to the phase differential function method, self-correlation function method or count method, and the VCO or NCO is controlled based on this result of analysis.

摘要翻译： 即使在C / N比较低的时候，通过测量信号的相位并且仅使用具有少量星座点的时段来控制VCO或NCO（数控振荡器），也能实现稳定的载波恢复。 此时，如下避免假锁现象。 也就是说，通过已知的模式调制的相对较短的SYNC被输入到调制波中，VCO或NCO振荡频率在宽范围内被扫描，并且在可以接收SYNC的频率上停止扫描，从而执行粗略 控制AFC。 此外，在调制波中提供具有很少的星座点的长时间段，然后在该周期中获得接收到的调制信号的频率与VCO或NCO的本地振荡信号之间的差。 根据相位差函数法，自相关函数法或计数法对该频差进行分析，并根据分析结果对VCO或NCO进行控制。

公开(公告)号：US5561467A

公开(公告)日：1996-10-01

申请号：US498778

申请日：1990-03-26

申请人： Yoshio Takeuchi ,  Makoto Okui ,  Isao Kondo ,  Yasuaki Kanatsugu ,  Junji Kumada ,  Taiichiro Kurita ,  Kazuhiko Shibuya ,  Taiji Nishizawa ,  Yutaka Tanaka ,  Minoru Honda ,  Ryoichi Yajima ,  Shoichi Suzuki ,  Hisakazu Kato ,  Hiroyuki Hamazumi ,  Kazumasa Enami ,  Seiichi Gohshi ,  Yoshinori Izumi ,  Haruo Okuda ,  Ichiro Yuyama ,  Sumio Yano ,  Makoto Tadenuma

发明人： Yoshio Takeuchi ,  Makoto Okui ,  Isao Kondo ,  Yasuaki Kanatsugu ,  Junji Kumada ,  Taiichiro Kurita ,  Kazuhiko Shibuya ,  Taiji Nishizawa ,  Yutaka Tanaka ,  Minoru Honda ,  Ryoichi Yajima ,  Shoichi Suzuki ,  Hisakazu Kato ,  Hiroyuki Hamazumi ,  Kazumasa Enami ,  Seiichi Gohshi ,  Yoshinori Izumi ,  Haruo Okuda ,  Ichiro Yuyama ,  Sumio Yano ,  Makoto Tadenuma

IPC分类号： H04N7/00 ,  H04N7/015 ,  H04N7/08 ,  H04N7/081 ,  H04N9/83 ,  H04N11/14 ,  H04N11/24

CPC分类号： H04N7/0152 ,  H04N11/002 ,  H04N7/007 ,  H04N7/0803 ,  H04N7/081 ,  H04N9/832 ,  H04N11/14 ,  H04N7/0122

摘要： High resolution vertical and horizontal components of a high definition video signal are combined with a standard broadcast system video signal, such as the NTSC system, in which high frequency horizontal resolution components are sampled and used to modulate at least a first sub-carrier signal. The first sub-carrier is frequency interleaved onto the standard broadcast signal. Vertical high resolution components are time compressed and time division multiplexed onto top and bottom portions of the standard broadcast signal. The modified broadcast signal can be decoded by a standard receiver to display a standard resolution video image, while receivers designed to decode the modified signal can time division demultiplex the vertical high resolution components and demodulate the horizontal high resolution components, combine these components with the standard components, and generate a high definition video image.

摘要翻译： 高清晰度视频信号的高分辨率垂直和水平分量与诸如NTSC系统的标准广播系统视频信号组合，其中高频水平分辨率分量被采样并用于至少调制第一副载波信号。 第一副载波被频率交织到标准广播信号上。 垂直高分辨率分量被时间压缩并且被时分复用到标准广播信号的顶部和底部。 修改的广播信号可以由标准接收机解码以显示标准分辨率视频图像，而被设计为解码修改的信号的接收机可以对垂直高分辨率分量进行时分解复用并且解调水平高分辨率分量，将这些分量与标准 组件，并生成高分辨率视频图像。

公开(公告)号：US06879630B2

公开(公告)日：2005-04-12

申请号：US09822272

申请日：2001-04-02

申请人： Yoshiro Kokuryo ,  Nobuo Tsukamoto ,  Hiroyuki Hamazumi

发明人： Yoshiro Kokuryo ,  Nobuo Tsukamoto ,  Hiroyuki Hamazumi

IPC分类号： H04L25/03 ,  H04L27/06 ,  G06F17/10 ,  H04L27/14 ,  H04L27/22

CPC分类号： H04L25/03133 ,  H04L2025/03477 ,  H04L2025/0377

摘要： A demodulation circuit for demodulating a multilevel digital modulation signal. Only an in-phase or quadrature component of the training signal generated in the demodulation circuit is used for equalization convergence. Tap coefficients of an equalizing training equalizer are updated by supplying either the in-phase or quadrature component so that the calculation amount can be reduced. When the equalization convergence is established, the obtained tap coefficients are rotated in phase and set to a data reproduction equalizer.

摘要翻译： 一种用于解调多电平数字调制信号的解调电路。 仅在解调电路中产生的训练信号的同相或正交分量用于均衡收敛。 通过提供同相或正交分量来更新均衡训练均衡器的抽头系数，使得可以减少计算量。 当均衡收敛建立时，所获得的抽头系数相位旋转并设置为数据再现均衡器。