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1. 发明授权

US5506836A Orthogonal frequency division multiplex demodulation 失效
标题翻译：正交频分复用解调
公开(公告)号：US5506836A
公开(公告)日：1996-04-09
申请号：US281169
申请日：1994-07-27
申请人： Yasunari Ikeda , Toshihisa Hyakudai , Osamu Ito , Yoshikazu Miyato
发明人： Yasunari Ikeda , Toshihisa Hyakudai , Osamu Ito , Yoshikazu Miyato
IPC分类号： H04J11/00 , H04L27/22 , H04L27/227 , H04L27/26 , H04L27/38
CPC分类号： H04L27/2662 , H04L27/2657 , H04L27/2675 , H04L27/2679
摘要： An orthogonal frequency division multiplex (OFDM) demodulation apparatus which accurately reproduces a clock and accurately generates a time window for discrete Fourier transformation (DFT) for stable demodulation of an OFDM modulated signal, wherein a clock reproduction circuit of the OFDM demodulation apparatus includes a Costas computation circuit and processes a signal corresponding to the specific carrier wave signal of a predetermined single wave for each symbol out of the I and Q channel signals obtained by subjecting the OFDM modulated signal to DFT to generate a control voltage using the Costas computation circuit and low pass filters and operates a voltage control oscillator to reproduce a clock signal. The clock signal is divided to produce the time window signals used in the DFT circuit.
摘要翻译：一种正交频分复用（OFDM）解调装置，其精确地再现时钟并且准确地生成用于OFDM调制信号的稳定解调的离散付里叶变换（DFT）的时间窗口，其中OFDM解调装置的时钟再生电路包括科斯塔斯计算电路，并且通过使用Costas计算电路对OFDM调制信号进行DFT生成控制电压而获得的I和Q信道信号中的每个符号处理对应于预定单波的特定载波信号的信号，并且使用Costas计算电路通过滤波器并操作压控振荡器来再现时钟信号。时钟信号被分割以产生在DFT电路中使用的时间窗信号。

2. 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。

3. 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。

4. 发明授权

US5920598A 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：US5920598A
公开(公告)日：1999-07-06
申请号：US67651
申请日：1998-04-27
申请人： Toshihisa Hyakudai , Yasunari Ikeda
发明人： Toshihisa Hyakudai , Yasunari Ikeda
IPC分类号： H04J11/00 , H04L27/26 , H04L27/06 , H04L5/06
CPC分类号： H04L27/265 , H04L27/2657 , H04L27/2675
摘要： An apparatus and method for receiving an OFDM signal arranged to reproduce correct carriers. I channel data and Q channel data decomposed into subcarrier components by FFT processing are differential-demodulated by a differential demodulation circuit to remove an FFT window phase error and a reproducing carrier phase error. In a differential demodulation circuit, a reproducing carrier frequency error and a phase error dependent on a reproducing clock frequency error are removed and only I-axis data is thereafter output to be stored in a RAM with respect each symbol. A pilot signal selecting data generation circuit supplies the RAM with data which is prepared by suitably shifting pilot signal selecting data used as a reference. Resulting Data read out is accumulated by cumulative addition performed by a cumulative addition circuit. A maximum value detection circuit detects a maximum value of the output from the cumulative addition circuit, and the amount of shift of pilot signal selecting data is stored in a reproducing carrier frequency error storage circuit. The reproducing carrier frequency error storage circuit outputs the amount of shift corresponding to the maximum value.
摘要翻译：一种用于接收布置成再现正确载波的OFDM信号的装置和方法。通过FFT处理分解成子载波分量的I信道数据和Q信道数据被差分解调电路差分解调，以消除FFT窗口相位误差和再现载波相位误差。在差分解调电路中，去除了依赖于再现时钟频率误差的再现载波频率误差和相位误差，并且此后只有I轴数据被输出以存储在每个符号的RAM中。导频信号选择数据生成电路向RAM提供通过适当地移动用作基准的导频信号选择数据而准备的数据。所得到的数据读出通过累积加法电路的累计加法累积。最大值检测电路检测累积加法电路的输出的最大值，并将导频信号选择数据的移位量存储在再现载波频率误差存储电路中。再现载波频率误差存储电路输出对应于最大值的移位量。

5. 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。

6. 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。

7. 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。

8. 发明申请

US20070297322A1 OFDM modulation/demodulation system 有权
标题翻译： OFDM调制/解调系统
公开(公告)号：US20070297322A1
公开(公告)日：2007-12-27
申请号：US11892135
申请日：2007-08-20
申请人： Yoshikazu Miyato , Yasunari Ikeda
发明人： Yoshikazu Miyato , Yasunari Ikeda
IPC分类号： H04J11/00
CPC分类号： H04L25/03866 , H04L1/0057 , H04L1/0059 , H04L1/0065 , H04L25/20 , H04L27/2627 , H04L27/2649 , H04L2027/0028
摘要： A radio relay system (1) comprises a wireless camera (11) and a signal receiving relay station (12). The wireless camera (11) wirelessly transmits signals to the signal receiving relay station (12) by using the OFDM modulation method. The wireless camera (11) and the signal receiving relay station (12) perform energy dispersion at the time of transmission-line-coding/decoding a transport stream. The PRBS seed (initial value) to be used for the energy dispersion can be externally modified and the user can arbitrarily select a value for the seed.
摘要翻译：无线电中继系统（1）包括无线照相机（11）和信号接收中继站（12）。无线摄像机（11）通过使用OFDM调制方式将信号无线发送到信号接收中继站（12）。无线照相机（11）和信号接收中继站（12）在对传输流进行传输线编码/解码时执行能量分散。用于能量色散的PRBS种子（初始值）可以被外部修改，用户可以任意选择种子的值。

9. 发明授权

US07327669B2 OFDM modem system 有权
标题翻译： OFDM调制解调器系统
公开(公告)号：US07327669B2
公开(公告)日：2008-02-05
申请号：US10129203
申请日：2001-09-07
申请人： Yoshikazu Miyato , Yasunari Ikeda
发明人： Yoshikazu Miyato , Yasunari Ikeda
IPC分类号： H04J14/02 , H04J9/00 , H04B7/216 , H04B1/00 , H04B10/08
CPC分类号： H04L25/03866 , H04L1/0057 , H04L1/0059 , H04L1/0065 , H04L25/20 , H04L27/2627 , H04L27/2649 , H04L2027/0028
摘要： A radio relay system (1) comprises a wireless camera (11) and a signal receiving relay station (12). The wireless camera (11) wirelessly transmits signals to the signal receiving relay station (12) by using the OFDM modulation method. The wireless camera (11) and the signal receiving relay station (12) perform energy dispersion at the time of transmission-line-coding/decoding a transport stream. The PRBS seed (initial value) to be used for the energy dispersion can be externally modified and the user can arbitrarily select a value for the seed.
摘要翻译：无线电中继系统（1）包括无线照相机（11）和信号接收中继站（12）。无线摄像机（11）通过使用OFDM调制方式将信号无线发送到信号接收中继站（12）。无线照相机（11）和信号接收中继站（12）在对传输流进行传输线编码/解码时执行能量分散。用于能量色散的PRBS种子（初始值）可以被外部修改，用户可以任意选择种子的值。

10. 发明申请

US20050169166A1 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：US20050169166A1
公开(公告)日：2005-08-04
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 , H04L5/02 , H04L7/08 , H04L27/26
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。

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