公开(公告)号：US5920228A

公开(公告)日：1999-07-06

申请号：US895093

申请日：1997-07-16

申请人： Shigeru Soga ,  Daisuke Hayashi ,  Takaya Hayashi ,  Seiji Sakashita

发明人： Shigeru Soga ,  Daisuke Hayashi ,  Takaya Hayashi ,  Seiji Sakashita

IPC分类号： H04L27/38 ,  H04L27/22

CPC分类号： H04L27/3872

摘要： A demodulation method for tentatively demodulating a modulated input signal by a signal having a fixed frequency to form a tentative complex demodulated signal and then generating a determined complex demodulated signal from the tentative complex demodulated signal. The method includes step (a) of obtaining a determined complex demodulated signal by compensating for the tentative complex demodulated signal based on an optimum phase compensation amount; step (b) of estimating an optimum frequency compensation amount based on a shift in the optimum phase compensation amount during a predetermined cycle; and step (c) of estimating an immediately subsequent optimum phase compensation amount to be used in the steps (a) and (b) performed in repetition, based on the tentative complex demodulated signal, the determined complex demodulated signal, and the optimum frequency compensation amount.

摘要翻译： 一种用于通过具有固定频率的信号暂时解调调制输入信号以形成暂定复数解调信号，然后从暂定复数解调信号产生确定的复解调信号的解调方法。 该方法包括步骤（a），通过基于最佳相位补偿量补偿暂定复数解调信号来获得确定的复解调信号; 步骤（b），基于在预定周期内的最佳相位补偿量的偏移来估计最佳频率补偿量; 以及步骤（c），基于暂定复合解调信号，所确定的复解调信号和最佳频率补偿来估计在重复执行的步骤（a）和（b）中将要使用的紧随其后的最佳相位补偿量 量。

公开(公告)号：US5398080A

公开(公告)日：1995-03-14

申请号：US70751

申请日：1993-06-03

申请人： Seiji Sakashita ,  Hiroaki Ozeki ,  Ippei Kanno ,  Daisuke Hayashi

发明人： Seiji Sakashita ,  Hiroaki Ozeki ,  Ippei Kanno ,  Daisuke Hayashi

IPC分类号： H03D7/18 ,  H03B1/00 ,  H03B5/18 ,  H03D3/00 ,  H03D7/16 ,  H04N5/50

CPC分类号： H04N5/4446 ,  H03D3/007 ,  H03D7/165 ,  H03B2201/0208 ,  H03B5/1805 ,  H03D7/18

摘要： In a television receiver in which image frequency signals for desired signals are removed when television broadcasting signals are frequency-converted through a local oscillator and mixers, the local oscillator generates biaxial orthogonal signals to be frequency-converted by respective mixers, an output signal of one mixer being phase-shifted to be added to an output signal of the other mixer so as to thereby offset only the image frequency signals. The local oscillator and a phase shifter operate so as to follow the frequency change of the intermediate frequency signal so as to thereby stabilize the suppression of the image frequency signal.

摘要翻译： 在电视接收机中，当电视广播信号通过本地振荡器和混频器进行频率转换时，所需信号的图像频率信号被去除，本地振荡器产生双轴正交信号，由各个混频器进行频率转换，输出信号为1 混频器被相移以被添加到另一个混频器的输出信号，从而仅偏移图像频率信号。 本地振荡器和移相器工作以跟随中频信号的频率变化，从而稳定图像频率信号的抑制。

公开(公告)号：US5535220A

公开(公告)日：1996-07-09

申请号：US182830

申请日：1994-01-19

申请人： Ippei Kanno ,  Seiji Sakashita ,  Hiroaki Ozeki ,  Daisuke Hayashi ,  Todd S. Bowser

发明人： Ippei Kanno ,  Seiji Sakashita ,  Hiroaki Ozeki ,  Daisuke Hayashi ,  Todd S. Bowser

IPC分类号： H03M13/23 ,  H03M13/27 ,  H03M13/33 ,  H04L1/00 ,  H04L7/04 ,  H04L27/00 ,  H04L27/18 ,  G06F11/00

CPC分类号： H04L1/0071 ,  H03M13/271 ,  H03M13/276 ,  H03M13/33 ,  H04L1/0042 ,  H04L1/0054 ,  H04L7/048

摘要： A forward error correcting transmitter and receiver for preventing the erroneous detection of synchronization is provided in a system in which synchronization of an interleaver circuit and a deinterleaver circuit, to be inserted between a convolutional encoder and a Viterbi decoder, is obtained from a synchronization detecting circuit of the Viterbi decoder. A LFSR (Linear Feedback Shift Register) is used as a row-direction address counter during writing and an up/down counter is used as a column-direction address counter during reading, during the interleaver circuit. In the deinterleaver circuit, an up/down counter is used as the column-direction address counter during writing, and an LFSR is used as the row-direction address counter during reading.

摘要翻译： 在从同步检测电路获得插入卷积编码器和维特比译码器之间的交错器电路和去交织器电路的同步的系统中，提供了用于防止同步错误检测的前向纠错发送器和接收器 的维特比解码器。 在写入期间，LFSR（线性反馈移位寄存器）用作行方向地址计数器，并且在交织器电路期间，在读取期间将升/降计数器用作列方向地址计数器。 在去交错电路中，在写入期间使用升/减计数器作为列方向地址计数器，在读取期间使用LFSR作为行方向地址计数器。

公开(公告)号：US5914983A

公开(公告)日：1999-06-22

申请号：US523913

申请日：1995-09-06

申请人： Todd Stephen Bowser ,  Daisuke Hayashi ,  Ippei Kanno ,  Seiji Sakashita ,  Hiroaki Ozeki

发明人： Todd Stephen Bowser ,  Daisuke Hayashi ,  Ippei Kanno ,  Seiji Sakashita ,  Hiroaki Ozeki

IPC分类号： H03H15/00 ,  H03H21/00 ,  H04B3/06 ,  H04L25/03 ,  H04L27/01 ,  H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC分类号： H04L25/0305 ,  H04L2025/03662

摘要： A digital signal error reduction apparatus of the present invention tracks and reduces both quickly changing errors and static errors in a digital signal which are caused by time variant multipath distortion, co-channel interference, and other transmission path interferences, including nonlinear distortion. A transversal filter is implemented for filtering the digital signal. A error detection device is implemented for calculating an error of the digital signal. A coefficient engine device is used for receiving the digital signal and the error, for extracting the error, and for updating a tap coefficient for the transversal filter so that the error is minimal.

摘要翻译： 本发明的数字信号误差减少装置跟踪并减少由时变多径失真，同信道干扰以及包括非线性失真的其它传输路径干扰引起的数字信号中的快速变化的误差和静态误差。 实现了对数字信号进行滤波的横向滤波器。 实施用于计算数字信号的误差的误差检测装置。 系数引擎装置用于接收数字信号和误差，用于提取误差，并用于更新横向滤波器的抽头系数，使得误差最小。

公开(公告)号：USRE40701E1

公开(公告)日：2009-04-14

申请号：US10693526

申请日：2003-10-27

申请人： Mitsuaki Oshima ,  Seiji Sakashita

发明人： Mitsuaki Oshima ,  Seiji Sakashita

IPC分类号： H04L5/16

CPC分类号： G11B20/00086 ,  G11B27/034 ,  G11B27/105 ,  G11B2220/213 ,  G11B2220/2545 ,  H04L1/006 ,  H04L1/0065 ,  H04L1/007 ,  H04L27/02 ,  H04L27/04 ,  H04L27/183 ,  H04L27/2602 ,  H04L27/2604 ,  H04L27/34 ,  H04L27/3488 ,  H04L27/3854 ,  H04N5/4401 ,  H04N7/015 ,  H04N7/54 ,  H04N21/234327 ,  H04N21/2383 ,  H04N21/43637 ,  H04N21/4382 ,  H04N21/440227 ,  H04N21/64792

摘要： At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into low and high frequency band components which are designated as first and second data streams respectively. Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability. Furthermore, a communication system based on an OFDM system is utilized for data transmission of a plurality of subchannels, wherein the subchannels are differentiated by changing the length of a guard time slot or a carrier wave interval of a symbol transmission time slot, or changing the transmission electric power of the carrier.

公开(公告)号：USRE40241E1

公开(公告)日：2008-04-15

申请号：US09244037

申请日：1999-02-04

申请人： Mitsuaki Oshima ,  Seiji Sakashita

发明人： Mitsuaki Oshima ,  Seiji Sakashita

IPC分类号： H04L5/16 ,  H04B1/38 ,  H04N5/46

摘要： At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the siganl points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into low and high frequency band components which are designated as first and second data streams respectively. Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability. Furthermore, a communication system based on an OFDM system is utilized for data transmission of a plurality of subchannels, wherein the subchannels are differentiated by changing the length of a guard time slot or a carrier wave interval of a symbol transmission time slot, or changing the transmission electric power of the carrier.

摘要翻译： 在发射机侧，根据用于在信号空间图中产生相关信号点的输入信号调制载波。 输入信号被分成两个，第一个和第二个数据流。 信号点被划分为分配了第一数据流的数据的信号点组。 此外，第二数据流的数据被分配给每个信号点组的信号点。 通过将siganl点移动到至少在极坐标系中表示的空间图中的其他位置来开发第一和第二数据流之间的传输错误率的差异。 在接收机侧，可以从接收到的信号重建第一和/或第二数据流。 在TV广播服务中，电视信号由发射机分成低频和高频分量，分别被指定为第一和第二数据流。 在接收到TV信号时，接收机可以仅根据其能力再现低频带分量或低频和高频分量两者。 此外，基于OFDM系统的通信系统被用于多个子信道的数据传输，其中通过改变符号传输时隙的保护时隙或载波间隔的长度来区分子信道，或者改变 载波的传输电力。

公开(公告)号：USRE39902E1

公开(公告)日：2007-10-30

申请号：US09672946

申请日：2000-09-29

申请人： Mitsuaki Oshima ,  Seiji Sakashita

发明人： Mitsuaki Oshima ,  Seiji Sakashita

IPC分类号： H04L27/02

摘要： At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into low and high frequency band components which are designated as first and second data streams respectively. Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability. Furthermore, a communication system based on an OFDM system is utilized for data transmission of a plurality of subchannels, wherein the subchannels are differentiated by changing the length of a guard time slot or a carrier wave interval of a symbol transmission time slot, or changing the transmission electric power of the carrier.

摘要翻译： 在发射机侧，根据用于在信号空间图中产生相关信号点的输入信号调制载波。 输入信号被分成两个，第一个和第二个数据流。 信号点被划分为分配了第一数据流的数据的信号点组。 此外，第二数据流的数据被分配给每个信号点组的信号点。 通过将信号点移动到至少在极坐标系中表示的空间图中的其他位置来开发第一和第二数据流之间的传输错误率的差异。 在接收机侧，可以从接收到的信号重建第一和/或第二数据流。 在TV广播服务中，电视信号由发射机分成低频和高频分量，分别被指定为第一和第二数据流。 在接收到TV信号时，接收机可以仅根据其能力再现低频带分量或低频和高频分量两者。 此外，基于OFDM系统的通信系统被用于多个子信道的数据传输，其中通过改变符号传输时隙的保护时隙或载波间隔的长度来区分子信道，或者改变 载波的传输电力。

公开(公告)号：US20060111038A1

公开(公告)日：2006-05-25

申请号：US11319058

申请日：2005-12-28

申请人： Hidenori Tatsumi ,  Eiji Ueda ,  Seiji Sakashita

发明人： Hidenori Tatsumi ,  Eiji Ueda ,  Seiji Sakashita

IPC分类号： H04B1/18

CPC分类号： H04N21/26208 ,  H04H60/39 ,  H04H60/51 ,  H04N7/165 ,  H04N7/17318 ,  H04N21/25841 ,  H04N21/25891 ,  H04N21/26283 ,  H04N21/2668 ,  H04N21/41407 ,  H04N21/4524 ,  H04N21/454 ,  H04N21/47214 ,  H04N21/4882 ,  H04N21/6131

摘要： Via a mobile communication network, a transmission apparatus receives position information representing a current position of a reception apparatus. Based on the received position information, the transmission apparatus generates notice data indicating that it is necessary to correct preprogrammed program information identifying a program which has been preprogrammed for viewing or preprogrammed for recording and being generated at the reception apparatus, and transmits the generated notice data to the reception apparatus. Accordingly, a transmission apparatus is provided which generates information that allows preprogramming of a broadcast program for viewing or recording to be properly performed at the reception apparatus side, or which generates a correct broadcast program table, and transmits the generated information or program table to the reception apparatus.

公开(公告)号：US06067329A

公开(公告)日：2000-05-23

申请号：US866885

申请日：1997-05-30

申请人： Hisaya Kato ,  Seiji Sakashita ,  Kunio Ninomiya

发明人： Hisaya Kato ,  Seiji Sakashita ,  Kunio Ninomiya

IPC分类号： H04L27/06 ,  H04L27/22

CPC分类号： H04L27/06

摘要： A Vestigal Sideband (VSB) demodulator having a clock generator for generating a clock signal based on a symbol frequency of the VSB signal; an A/D converter for converting the VSB signal into a digital signal based on the clock signal of the clock generator; a first multiplier for multiplying the digital signal by a first value sequence and generating a first multiplier output signal; a second multiplier for multiplying the digital signal by a second value sequence and generating a second multiplier output signal; a complex type filter for shaping and VSB demodulation of the multiplier output signals and generating Inphase and Quadrature data output signals; a decimating circuit for decimating the Inphase and Quadrature data output signals and generating decimated signals; a complex multiplier for multiplying the decimated signals by a predetermined value and generating multiplied output signals; an error detector for detecting a frequency deviation and a phase deviation from the multiplied output signals and generating the predetermined value for the complex multiplier; and DC offset canceler for removing a DC component from a portion of the multiplied output signals of the complex multiplier.

摘要翻译： 一种Vestigal边带（VSB）解调器，具有时钟发生器，用于根据VSB信号的符号频率产生时钟信号; A / D转换器，用于基于时钟发生器的时钟信号将VSB信号转换成数字信号; 第一乘法器，用于将数字信号乘以第一值序列并产生第一乘法器输出信号; 第二乘法器，用于将数字信号乘以第二值序列并产生第二乘法器输出信号; 用于整形和VSB解调乘法器输出信号并产生同相和正交数据输出信号的复合型滤波器; 抽取电路，用于抽取同相和正交数据输出信号并产生抽取信号; 复数乘法器，用于将抽取的信号乘以预定值并产生相乘的输出信号; 误差检测器，用于检测来自相乘的输出信号的频率偏差和相位偏差，并产生复数乘法器的预定值; 以及DC偏移消除器，用于从复数乘法器的相乘输出信号的一部分中去除DC分量。

公开(公告)号：US5134707A

公开(公告)日：1992-07-28

申请号：US600988

申请日：1990-10-23

申请人： Seiji Sakashita ,  Hiroaki Ozeki ,  Ippei Kanno

发明人： Seiji Sakashita ,  Hiroaki Ozeki ,  Ippei Kanno

IPC分类号： H03D3/24 ,  H04B1/16

CPC分类号： H03D3/244 ,  H03D3/242 ,  H04B1/1638

摘要： Radio waves used in broadcasting and communications making use of broadcasting satellite and communication satellite are FM signals, and the frequency shift and exclusive bandwidth vary depending on the modulation signal. The satellite broadcasting receiver is designed to control the frequency shift so that the amplitude of the demodulation signal is constant, thereby making the bandwidth of the intermediate frequency filter, so as to be capable of receiving using just one filter. At this time, the frequency shift can be controlled continuously, from large to small one, in a predetermined exclusive bandwidth. When further expanding the frequency shift, since the exclusive bandwidth is extended, the noise electric power is increased and the receiving sensitivity is lowered as compared with the exclusive machine. Accordingly, when expanding the frequency shift, the noise bandwidth is narrowed in the PLL demodulator, thereby enhancing the receiving sensitivity.