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1. 发明授权

US06973118B1 Digital broadcasting apparatus 有权
标题翻译：数字广播设备
公开(公告)号：US06973118B1
公开(公告)日：2005-12-06
申请号：US09914131
申请日：2000-02-25
申请人： Yasunari Ikeda , Toshihisa Hyakudai , Takahiro Okada , Tamotsu Ikeda , Toru Kuroda , Naohiko Iai , Kenichi Tsuchida , Makoto Sasaki
发明人： Yasunari Ikeda , Toshihisa Hyakudai , Takahiro Okada , Tamotsu Ikeda , Toru Kuroda , Naohiko Iai , Kenichi Tsuchida , Makoto Sasaki
IPC分类号： H04H20/72 , H04L27/26 , H04B1/69 , H04J11/00 , H04N5/94
CPC分类号： H04L27/2618 , H04B2201/70706 , H04H20/72
摘要： A frequency interleaving circuit frequency-interleaves main signals generated according to sound data by parameters set according to frequencies of transmission channels. A sub-signal generating circuit generates sub-signals for transmission control including pilot signals. Mapping circuits modulate the sub-signals by using pseudo-random sequences generated based on initial values of random codes set according to frequencies of transmission channels. The frequency-interleaved main signals and the sub-signals modulated by the mapping circuits are OFDM-modulated. Then, they are converted to the frequencies of the transmission channels. An increase of a dynamic range of transmission signals can be suppressed by controlling the initial values of random codes set.
摘要翻译：频率交织电路按照根据传输信道的频率设置的参数，根据声音数据对由主要信号进行频率交织。子信号发生电路产生用于包括导频信号的传输控制的子信号。映射电路通过使用基于根据传输信道的频率设置的随机码的初始值生成的伪随机序列来调制子信号。频率交织的主信号和由映射电路调制的子信号被OFDM调制。然后，它们被转换成传输信道的频率。可以通过控制随机码集的初始值来抑制传输信号的动态范围的增加。

2. 发明授权

US07356094B1 Digital broadcast receiving apparatus 失效
标题翻译：数字广播接收装置
公开(公告)号：US07356094B1
公开(公告)日：2008-04-08
申请号：US09936153
申请日：2000-03-10
申请人： Yasunari Ikeda , Toshihisa Hyakudai , Takahiro Okada , Tamotsu Ikeda
发明人： Yasunari Ikeda , Toshihisa Hyakudai , Takahiro Okada , Tamotsu Ikeda
IPC分类号： H03K9/00 , H04L27/00
CPC分类号： H04L27/2655 , H04L27/2647
摘要： A digital broadcast receiving apparatus for receiving a broadcast signal generated by combining sub signals modulated using a random sequence generated based on an initial value set in accordance with a frequency of a broadcast channel by a signal transmission control use signal and a main signal generated based on information source data and reproducing the information source data contained in the received broadcast signal.
摘要翻译：一种数字广播接收装置，用于接收通过组合使用基于根据广播频道的频率设置的初始值而生成的随机序列调制的子信号，通过信号传输控制使用信号和基于信息源数据，并且再现包含在所接收的广播信号中的信息源数据。

3. 发明授权

US06215819B1 Receiving apparatus and receiving method 失效
标题翻译：接收装置和接收方法
公开(公告)号：US06215819B1
公开(公告)日：2001-04-10
申请号：US09069702
申请日：1998-04-29
申请人： Toshihisa Hyakudai , Takahiro Okada , Yasunari Ikeda
发明人： Toshihisa Hyakudai , Takahiro Okada , Yasunari Ikeda
IPC分类号： H04B166
CPC分类号： H04L27/2657 , H04L27/2662 , H04L27/2679
摘要： An apparatus and method for receiving an OFDM signal arranged to accurately reproduce a clock signal. I channel data and Q channel data are differential-demodulated by a differential demodulation circuit and are supplied to a ROM. The ROM reads out an intersymbol phase change amount corresponding to the differential-demodulated data and supplies it to a gate circuit. The gate circuit extracts only a component corresponding to each of pilot signals in the input data, and supplies the extracted component to a sign inversion circuit and to a selector. The selector selects the output from the gate circuit if the pilot signal is a positive frequency value or the output from the sign inversion circuit if the pilot signal is a negative frequency value, and supplies the obtained value to a cumulative addition circuit. The cumulative addition circuit performs cumulative addition of values output from the selector over a symbol period, and outputs the addition result to an average circuit. The average circuit averages the output from the cumulative addition circuit and controls the frequency of oscillation of a clock signal according to a value obtained by the average circuit.
摘要翻译：一种接收正交再现时钟信号的OFDM信号的装置和方法。 I通道数据和Q通道数据由差分解调电路进行差分解调并提供给ROM。 ROM读出对应于差分解调数据的符号间相位变化量，并将其提供给门电路。门电路仅提取与输入数据中的每个导频信号相对应的分量，并将所提取的分量提供给符号反转电路和选择器。如果导频信号是正频率值，则选择器选择来自门电路的输出，或者如果导频信号是负频率值，则从符号反转电路输出，并将获得的值提供给累积加法电路。累积加法电路在符号周期执行从选择器输出的值的累加，并将相加结果输出到平均电路。平均电路对累积加法电路的输出进行平均，并根据平均电路获得的值来控制时钟信号的振荡频率。

4. 发明授权

US06956812B2 Reception apparatus 失效
标题翻译：接收设备
公开(公告)号：US06956812B2
公开(公告)日：2005-10-18
申请号：US09826758
申请日：2001-04-05
申请人： Takahiro Okada , Toshihisa Hyakudai , Isao Matsumiya , Yasunari Ikeda
发明人： Takahiro Okada , Toshihisa Hyakudai , Isao Matsumiya , Yasunari Ikeda
IPC分类号： H04N5/455 , H04B14/00 , H04J11/00 , H04L27/26
CPC分类号： H04L27/2662 , H04L27/2607 , H04L27/2666 , H04L27/2678
摘要： A reception apparatus for OFDM signals having a short initial rise time since start of reception until outputting the sound and/or a picture. An OFDM reception apparatus 1 of the ISDB-T standard presets the TMCC information at the outset in a memory 19 in association with each broadcasting station. This TMCC information contains the information on the RF frequency and the guard interval length, time interleaving pattern information, the information on the carrier modulation scheme and the information on the code rate of the convolutional code. When a user selects a broadcasting station, a control circuit 18 reads out the TMCC information associated with the broadcasting station from the memory 19. The control circuit 18 affords the read-out TMCC information to each circuit to set e.g., the guard interval or the carrier modulation scheme.
摘要翻译：一种用于OFDM信号的接收装置，其具有从开始接收直到输出声音和/或图像之后的初始上升时间短的OFDM信号。 ISDB-T标准的OFDM接收装置1首先将TMCC信息与每个广播电台相关联地存储在存储器19中。该TMCC信息包含关于RF频率和保护间隔长度，时间交织模式信息，关于载波调制方案的信息和关于卷积码的码率的信息的信息。当用户选择广播电台时，控制电路18从存储器19读出与广播电台相关联的TMCC信息。控制电路18向每个电路提供读出的TMCC信息，以设置例如保护间隔或载波调制方案。

5. 发明授权

US07403472B2 OFDM receiving device and OFDM receiving method 有权
标题翻译： OFDM接收装置和OFDM接收方法
公开(公告)号：US07403472B2
公开(公告)日：2008-07-22
申请号：US11089810
申请日：2005-03-25
申请人： Takahiro Okada , Yoshikazu Miyato , Yasunari Ikeda , Tamotsu Ikeda
发明人： Takahiro Okada , Yoshikazu Miyato , Yasunari Ikeda , Tamotsu Ikeda
IPC分类号： H04J11/00
CPC分类号： H04L27/2656 , H04L5/023
摘要： The time required for switch the channel can be remarkably curtailed. When broadcasting signals through a plurality of information channels with an OFDM system, the plurality of information channels are multiplexed in the sense of frequency and collectively subjected to IFFT modulation for connected transmission instead of subjecting the plurality of information channels independently to OFDM modulation for transmission. With this arrangement, the efficiency of exploitation of frequencies is improved. According to the invention, the OFDM frames are synchronized for each information channel for the purpose of connected transmission. Then, the OFDM receiver can switch the information channel for signal reception, maintaining the frame synchronizing signals.
摘要翻译：切换通道所需的时间可以大大减少。当通过具有OFDM系统的多个信息信道广播信号时，多个信息信道在频率上被多路复用，并且对于所连接的发送集中地进行IFFT调制，而不是独立地对多个信道进行OFDM调制以进行传输。通过这种安排，提高了频率利用的效率。根据本发明，为了连接传输的目的，为每个信息信道同步OFDM帧。然后，OFDM接收机可以切换用于信号接收的信道，保持帧同步信号。

6. 发明授权

US5903546A Means and method of improving multiplexed transmission and reception by coding and modulating divided digital signals 失效
标题翻译：通过对分割的数字信号进行编码和调制来提高多路传输和接收的方法和方法
公开(公告)号：US5903546A
公开(公告)日：1999-05-11
申请号：US632411
申请日：1996-07-18
申请人： Tamotsu Ikeda , Yasunari Ikeda , Takahiro Okada
发明人： Tamotsu Ikeda , Yasunari Ikeda , Takahiro Okada
IPC分类号： H04L1/00 , H04L27/26 , H04L27/34 , H04N5/44 , H04N7/24 , H04N7/26 , H04J3/22
CPC分类号： H04L27/2604 , H04L1/0003 , H04L1/0017 , H04L1/0054 , H04L1/006 , H04L1/0065 , H04L27/183 , H04L27/3488 , H04L5/0007 , H04L5/0042 , H04L5/0044 , H04N21/2383 , H04N21/4382 , H04L2001/0098 , H04N19/39 , H04N5/4401 , Y02B60/31
摘要： The present invention is used for example digital television broadcasting and provides a good television picture and sound where the signal level is large on the reception side and provides a television picture and sound of a certain degree of quality even in a case where the signal level is small. The signal transmitting apparatus (10) divides the series of input information in accordance with the significance of the content of the data to obtain a plurality of input signals, encodes the input signals with respectively different encoding rates, multiplexes the same at the time slots for transmission, modulates the same by multi-value modulation methods different for every time slot corresponding to the coded signals, and transmits the resultant data via the communication transmission line (20) such as a satellite communication channel to the signal receiving apparatus (30). The signal receiving apparatus (30) demodulates the respective coded signals from the modulated signals received from the communication transmission line (20) by demodulation methods different for every time slot corresponding to the coded signals contained in the received signals, demultiplexes the same, decodes the result, and reproduces the respective input signals.
摘要翻译： PCT No.PCT / JP95 / 01736 Sec。 371日期：1996年7月18日 102（e）日期1996年7月18日PCT提交1995年8月31日PCT公布。公开号WO96 / 07260 日期1996年3月7日本发明用于数字电视广播，并且在接收侧提供了良好的电视图像和声音信号电平较大，并且即使在情况下也提供一定质量的电视图像和声音信号电平较小。信号发送装置（10）根据数据的内容的重要性对输入信息的一系列进行划分以获得多个输入信号，以分别对不同的编码率对输入信号进行编码，在时隙多路复用通过对与编码信号相对应的每个时隙不同的多值调制方式进行调制，并通过诸如卫星通信信道的通信传输线（20）将结果数据发送到信号接收装置（30）。信号接收装置（30）通过与包含在接收信号中的编码信号相对应的每个时隙不同的解调方式，对从通信传输线（20）接收的调制信号中的各个编码信号进行解调，解复用结果并再现相应的输入信号。

7. 发明授权

US07158475B1 Transmitting apparatus and method and provision medium 有权
标题翻译：传输装置及方法及配套介质
公开(公告)号：US07158475B1
公开(公告)日：2007-01-02
申请号：US09936337
申请日：2000-03-10
申请人： Yasunari Ikeda , Tamotsu Ikeda , Takahiro Okada
发明人： Yasunari Ikeda , Tamotsu Ikeda , Takahiro Okada
IPC分类号： H04J11/00 , H04J3/06
CPC分类号： H04L27/2626
摘要： Influence from an adjacent signal is prevented even if a guard band is not provided.A phase comparison unit 21 compares a reference window signal input to a PLL circuit 4 and a window signal supplied from a frequency division circuit 22 and outputs the comparison result to an LPF 23. The LPF 23 extracts a low frequency component from the input signal and outputs the same to a voltage controlled oscillator 24. The signal output from the voltage controlled oscillator 24 is supplied as a clock to units of an OFDM modulation circuit 2 and, at the same time, supplied to the frequency division circuit 22. The frequency division circuit 22 divides the frequency of the supplied signal to thereby generate a new window signal and supplies the same to an IFFT unit 13. Further, the generated window signal is supplied to a PLL circuit 5. The PLL circuit 5 generates a clock for controlling a frequency modulation circuit 3 based on the supplied window signal.
摘要翻译：即使没有提供保护带，也防止相邻信号的影响。相位比较单元21比较输入到PLL电路4的参考窗口信号和从分频电路22提供的窗口信号，并将比较结果输出到LPF 23。 LPF23从输入信号中提取低频分量，并将其输出到压控振荡器24。从压控振荡器24输出的信号作为时钟被提供给OFDM调制电路2的单元，同时被提供给分频电路22。分频电路22对所提供的信号的频率进行分频，从而生成新的窗口信号，并将其提供给IFFT单元13。此外，生成的窗口信号被提供给PLL电路5。 PLL电路5基于所提供的窗口信号产生用于控制频率调制电路3的时钟。

8. 发明授权

US07075949B2 OFDM receiving device and OFDM receiving method 有权
公开(公告)号：US07075949B2
公开(公告)日：2006-07-11
申请号：US09834282
申请日：2001-04-12
申请人： Takahiro Okada , Yoshikazu Miyato , Yasunari Ikeda , Tamotsu Ikeda
发明人： Takahiro Okada , Yoshikazu Miyato , Yasunari Ikeda , Tamotsu Ikeda
IPC分类号： H04J3/06 , H04J11/00 , H04J1/00
CPC分类号： H04L27/2656 , H04L5/023
摘要： The time required for switch the channel can be remarkably curtailed. When broadcasting signals through a plurality of information channels with an OFDM system, the plurality of information channels are multiplexed in the sense of frequency and collectively subjected to IFFT modulation for connected transmission instead of subjecting the plurality of information channels independently to OFDM modulation for transmission. With this arrangement, the efficiency of exploitation of frequencies is improved. According to the invention, the OFDM frames are synchronized for each information channel for the purpose of connected transmission. Then, the OFDM receiver can switch the information channel for signal reception, maintaining the frame synchronizing signals.

9. 发明申请

US20050147186A1 Ofdm demodulation apparatus 审中-公开
标题翻译： Ofdm解调装置
公开(公告)号：US20050147186A1
公开(公告)日：2005-07-07
申请号：US10505794
申请日：2003-12-18
申请人： Kazuhisa Funamoto , Takahiro Okada , Tamotsu Ikeda , Atsushi Yajima , Yasunari Ikeda
发明人： Kazuhisa Funamoto , Takahiro Okada , Tamotsu Ikeda , Atsushi Yajima , Yasunari Ikeda
IPC分类号： H04J11/00 , H04L7/08 , H04L27/14 , H04L27/26
CPC分类号： H04L27/2605 , H04L27/2657 , H04L27/2662 , H04L27/2676
摘要： An OFDM demodulation (1) is provided which includes a guard correlation/peak time detection circuit (12) to generate a peak timing Np of a guard interval correlation value, and a timing synchronization circuit (13) to estimate a symbol-boundary time Nx from the peak timing Np. The timing synchronization circuit (13) calculates the symbol-boundary time Nx by filtering the peak time Np by a DLL (delay locked loop) filter (43). Further, the DLL filter (43) includes a limiter (52) to limit the range of phase-error component and an asymmetric gain circuit (53) to change the magnitude of the gain correspondingly to the polarity of the phase error to prevent the timing from being pulled out due to a fading or multipath.
摘要翻译：提供了一种OFDM解调（1），其包括：保护相关/峰值时间检测电路（12），用于产生保护间隔相关值的峰值定时Np;以及定时同步电路（13），用于估计符号边界时间Nx 从峰值时刻Np。定时同步电路（13）通过DLL（延迟锁定环）滤波器（43）对峰值时间Np进行滤波来计算符号边界时间Nx。此外，DLL滤波器（43）包括限制相位误差分量范围的限幅器（52）和非对称增益电路（53），以相应于相位误差的极性改变增益的幅度，以防止定时由于衰落或多路径而被拉出。

10. 发明授权

US5787123A Receiver for orthogonal frequency division multiplexed signals 失效
标题翻译：接收机用于正交频分复用信号
公开(公告)号：US5787123A
公开(公告)日：1998-07-28
申请号：US736720
申请日：1996-10-25
申请人： Takahiro Okada , Yasunari Ikeda , Tamotsu Ikeda
发明人： Takahiro Okada , Yasunari Ikeda , Tamotsu Ikeda
IPC分类号： H04L27/227 , H04J11/00 , H04L27/26 , H04L27/14
CPC分类号： H04L27/2657 , H04L27/265 , H04L27/2676
摘要： In view of regenerating clock with higher accuracy even under the condition that frequency distortion is generated due to the frequency selective Rayleigh fading, the OFDM (Orthogonal Frequency Division Multiplexing) modulated signal is converted to the baseband OFDM signal in the multipliers and a phase difference between the phase of the carrier forming the OFDM signal and the phase of the carrier before one OFDM symbol is calculated in the differential decoding circuit. A phase error of the carrier is calculated on the basis of the phase difference of the carrier in the carrier regenerating circuit or clock regenerating circuit and the local oscillator to generate the carrier and the local oscillator to generate clock are respectively controlled on the basis of the phase error of a plurality of carriers among those forming the OFDM signal.
摘要翻译：即使在由于频率选择性瑞利衰落而产生频率失真的条件下，鉴于再生时钟的精度更高，OFDM（正交频分复用）调制信号被转换为乘法器中的基带OFDM信号，并且相位差在差分解码电路中计算形成OFDM信号的载波的相位和在一个OFDM符号之前的载波的相位。基于载波再生电路或时钟再生电路中的载波的相位差和产生载波的本地振荡器以及产生时钟的本地振荡器分别控制载波的相位误差，基于构成OFDM信号的载波的多个载波的相位误差。

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