公开(公告)号：US06813321B1

公开(公告)日：2004-11-02

申请号：US09582229

申请日：2000-07-21

申请人： Hisakazu Katoh ,  Akinori Hashimoto ,  Yuichi Iwadate ,  Kazuhiko Shibuya ,  Fumiaki Minematsu ,  Shigeyuki Itoh ,  Tomohiro Saito ,  Kenichi Shiraishi ,  Akihiro Horii ,  Shoji Matsuda ,  Soichi Shinjo

发明人： Hisakazu Katoh ,  Akinori Hashimoto ,  Yuichi Iwadate ,  Kazuhiko Shibuya ,  Fumiaki Minematsu ,  Shigeyuki Itoh ,  Tomohiro Saito ,  Kenichi Shiraishi ,  Akihiro Horii ,  Shoji Matsuda ,  Soichi Shinjo

IPC分类号： H03D322

CPC分类号： H04L27/2273 ,  H04L7/042 ,  H04L27/0014 ,  H04L2027/0057 ,  H04L2027/0067 ,  H04L2027/0077 ,  H04L2027/0095

摘要： A digital demodulator which will need no absolute phasing circuit is provided. A known-pattern BPSK signal generating circuit 6 generates the same known-pattern BPSK signal as a known-pattern BPSK signal in a received digital modulated wave in synchronism with the known-pattern BPSK signal in the received digital modulated wave, a carrier-reproducing phase error detecting circuit 7 has a phase error table where one of reference phases in a signal point position of a demodulation baseband signal is made a convergence point, a phase error voltage corresponding to a phase error between a phase determined from the signal point position of the demodulation baseband signals and a phase convergence point is sent out, by enable-controlling a carrier-reproducing loop filter 8 according to the known-pattern BPSK signal outputted from the known-pattern BPSK signal generating circuit 6, the phase error voltage is smoothed, and carrier reproduction is performed while controlling the frequency of a reproduced carrier according to the smoothed output so that the phase in the signal point position coincides with the phase convergence point.

摘要翻译： 提供了不需要绝对定相电路的数字解调器。 已知模式BPSK信号发生电路6与接收的数字调制波中的已知模式BPSK信号同步地产生与接收的数字调制波中已知模式BPSK信号相同的已知模式BPSK信号，载波再现 相位误差检测电路7具有相位误差表，其中解调基带信号的信号点位置中的参考相位之一成为会聚点，相位误差电压对应于从信号点位置确定的相位之间的相位误差 通过根据从已知模式BPSK信号发生电路6输出的已知模式BPSK信号启用控制载波再现环路滤波器8，发送解调基带信号和相位收敛点，平滑相位误差电压 并且在根据平滑输出控制再现载波的频率的同时执行载波再现，使得si中的相位 点位置与相位收敛点一致。

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：US5063445A

公开(公告)日：1991-11-05

申请号：US511374

申请日：1990-04-19

申请人： Taiji Nishizawa ,  Yutaka Tanaka ,  Seiichi Gohshi ,  Junji Kumada ,  Yuichi Iwadate ,  Kazuhiko Shibuya ,  Toshihiko Susaki ,  Yukihiro Nishida ,  Minoru Honda ,  Taiichiro Kurita ,  Yoshinori Izumi ,  Makoto Okui ,  Isao Kondo ,  Ryoichi Yajima ,  Jun'ichi Ishida

发明人： Taiji Nishizawa ,  Yutaka Tanaka ,  Seiichi Gohshi ,  Junji Kumada ,  Yuichi Iwadate ,  Kazuhiko Shibuya ,  Toshihiko Susaki ,  Yukihiro Nishida ,  Minoru Honda ,  Taiichiro Kurita ,  Yoshinori Izumi ,  Makoto Okui ,  Isao Kondo ,  Ryoichi Yajima ,  Jun'ichi Ishida

IPC分类号： G06T9/00 ,  H04N7/015 ,  H04N7/04 ,  H04N11/24

CPC分类号： H04N7/04 ,  G06T9/004 ,  H04N11/008 ,  H04N7/0152

摘要： A multiple sub-sampling encoding/decoding system performing interfield and interframe offset sub-sampling of a broad bandwidth television signal. The system compresses the television signal to fit, for example, to the transmission bandwidth of the standard television systems, compensates the transmission characteristics, and achieves the optimal frequency allocation of the modulated transmission signal.

摘要翻译： 执行宽带电视信号的帧间和帧间偏移子采样的多个子采样编码/解码系统。 该系统压缩电视信号以适应例如标准电视系统的传输带宽，补偿传输特性，并实现调制传输信号的最佳频率分配。

公开(公告)号：US4949168A

公开(公告)日：1990-08-14

申请号：US246195

申请日：1988-09-19

申请人： Yuichi Ninomiya ,  Yuichi Iwadate

发明人： Yuichi Ninomiya ,  Yuichi Iwadate

IPC分类号： H03M1/06 ,  H03M1/14 ,  H04N5/21 ,  H04N7/015 ,  H04N7/12 ,  H04N7/46

CPC分类号： H03M1/069 ,  H04N19/59 ,  H04N5/211 ,  H04N7/0152 ,  H04N7/125 ,  H03M1/145

摘要： A decoding equalizer of high definition television signal transmission mode, such as MUSE, and a subrange-type A/D converter suitable for the equalizer. The decoding equalizer samples input data in equalization at a frequency twice the sampling frequency of the trunk system, with the equalizing A/D converter operating at a lower resolution and higher speed than the A/D converter for the trunk system. The subrange-type A/D converter includes A/D converters in multiple stages, with their driving clock frequencies having a specified relationship so that they are used commonly for the A/D conversdion of the high definition television signal and the A/D conversion of a test signal for detecting the transmission characteristics.