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    • 111. 发明授权
    • Signal transmitting apparatus and signal receiving apparatus using
orthogonal frequency division multiplexing
    • 使用正交频分复用的信号发送装置和信号接收装置
    • US5732068A
    • 1998-03-24
    • US437684
    • 1995-05-09
    • Nobuaki TakahashiSusumu TakahashiKenji Sugiyama
    • Nobuaki TakahashiSusumu TakahashiKenji Sugiyama
    • H04L27/26H04L27/34
    • H04L27/2626H04L27/2607H04L27/2657H04L27/2675
    • A signal transmitting apparatus using orthogonal frequency division multiplexing includes an inverse fast Fourier transform circuit for converting a digital information signal into a first multi-value QAM modulation signal. A guard interval setting circuit is operative for periodically generating a guard interval signal equal to a time segment of the first multi-value QAM modulation signal, and inserting the guard interval signal into the first multi-value QAM modulation signal to convert the first multi-value QAM modulation signal into a second multi-value QAM modulation signal. A clock signal generating circuit is operative for generating a first clock signal which drives the inverse fast Fourier transform circuit, and generating a second clock signal which drive the guard interval setting circuit. The inverse fast Fourier transform circuit is operative for generating a pilot signal which corresponds to a given-order carrier, and adding the pilot signal to the first multi-value QAM modulation signal. The pilot signal has a predetermined frequency and an angle modulation component which remains constant over a plurality of symbol periods. The pilot signal corresponding to a given integer times its wavelength is present in a guard interval occupied by the guard interval signal in the second multi-value QAM modulation signal. The pilot signal is continuously present over the guard interval and another interval.
    • 使用正交频分复用的信号发送装置包括用于将数字信息信号转换为第一多值QAM调制信号的快速傅立叶逆变换电路。 保护间隔设置电路用于周期性地产生等于第一多值QAM调制信号的时间段的保护间隔信号,并将保护间隔信号插入到第一多值QAM调制信号中, 值QAM调制信号转换成第二多值QAM调制信号。 时钟信号发生电路用于产生驱动逆快速傅里叶变换电路的第一时钟信号,并产生驱动保护间隔设定电路的第二时钟信号。 反相快速傅里叶变换电路用于产生对应于给定阶载波的导频信号,并将导频信号加到第一多值QAM调制信号上。 导频信号具有在多个符号周期内保持恒定的预定频率和角度调制分量。 对应于给定整数乘以其波长的导频信号存在于由第二多值QAM调制信号中的保护间隔信号占据的保护间隔中。 导频信号连续出现在保护间隔和另一个间隔之间。
    • 115. 发明授权
    • Digital data transmitting system for transmitting digital data a number
of times depending on an information content of the digital data
    • 数字数据发送系统,用于根据数字数据的信息内容多次发送数字数据
    • US4692816A
    • 1987-09-08
    • US626700
    • 1984-07-02
    • Hiroyuki SugiyamaNobuaki TakahashiTakeshi ShibamotoKazunori NishikawaMakoto Komura
    • Hiroyuki SugiyamaNobuaki TakahashiTakeshi ShibamotoKazunori NishikawaMakoto Komura
    • G11B20/18H04L1/08H04N9/806H04N5/85G11B20/12
    • H04L1/08G11B20/1803G11B20/1809H04N9/8066
    • A digital data transmitting system comprises a first circuit for transmitting digital data related to an information signal data in terms of sectors each having k words with respect to each channel, where k is a natural number. The transmission of the digital data is performed within a predetermined transmission time period once or a plurality of times according to a tolerance of data error rate for an information content of the digital data. The information signal data are among digital data related to a plurality of channels of information signals which are subjected to a digital modulation, and the plurality of channels of information signals are made up of a combination at least including the information signal data among three kinds of information signals. The three kinds of information signals are a non-compressed audio signal, a video signal, and the information signal data other than the non-compressed audio signal and the video signal. The system also comprises a second circuit for adding a code and a synchronizing signal to the digital data which are obtained from the first circuit, and for transmitting the digital data having the first code and the first synchronizing signal added thereto. The first code is at least indicative of a number of times the digital data are repeatedly transmitted within the predetermined transmission time period.
    • 数字数据发送系统包括:第一电路,用于根据关于每个信道具有k个字的扇区,发送与信息信号数据有关的数字数据,其中k是自然数。 数字数据的传输根据数字数据的信息内容的数据差错率的公差,在预定传输时间段内进行一次或多次。 信息信号数据是与进行数字调制的信道信号的多个信道有关的数字数据,多个信道信道的信道由至少包含3种信息信号的信息信号数据的组合构成 信息信号。 三种信息信号是非压缩音频信号,视频信号和除非压缩音频信号和视频信号之外的信息信号数据。 该系统还包括第二电路,用于将从第一电路获得的数字数据的码和同步信号相加,并且发送具有添加了第一码和第一同步信号的数字数据。 第一代码至少表示数字数据在预定传输时间段内重复发送的次数。
    • 116. 发明授权
    • Apparatus for reproducing a multichannel record disc
    • 用于再现多声道记录盘的装置
    • US4152550A
    • 1979-05-01
    • US843856
    • 1977-10-20
    • Nobuaki TakahashiFujio SuzukiMasao KasugaNorio Shibata
    • Nobuaki TakahashiFujio SuzukiMasao KasugaNorio Shibata
    • G11B3/00H04S3/00G11B3/74H03D3/00
    • G11B3/00H04S3/006
    • A multichannel record disc reproducing apparatus has a pickup cartridge for picking up signals from a multichannel record disc. A multiplexed signal was recorded on the disc by first multiplexing direct wave signals and angle-modulated wave signals which are recorded on opposite groove walls. Filters separate the picked up multiplexed signal into the direct wave signal and the angle-modulated wave signal. A demodulates circuit for demodulating the angle-modulated wave signal, thus separated. A matrix circuit separates the signals to obtain a plurality of separate channels from the direct wave signals and the demodulated signals. A circuit in a stage preceding the demodulator removes substantially all components of the higher harmonics at the carrier wave center frequency, which carrier was used for angle-modulating the original signal.
    • 多通道记录盘再现装置具有用于从多声道记录盘拾取信号的拾取盒。 通过首先复用记录在相对的槽壁上的直接波信号和角度调制波信号,将多路复用的信号记录在盘上。 滤波器将拾取的复用信号分离成直接波信号和角度调制波信号。 解调电路,用于解调被分离的角度调制波信号。 矩阵电路分离信号以从直接波信号和解调信号中获得多个分离的信道。 在解调器之前的阶段中的电路基本上去除了载波中心频率处的高次谐波的所有分量,该载波用于对原始信号进行角度调制。
    • 120. 发明授权
    • Hydraulic device for stepless transmission
    • 液压装置用于无级变速
    • US08943818B2
    • 2015-02-03
    • US13256526
    • 2009-05-13
    • Yusuke OgataKoichi TanakaNobuaki TakahashiKenji MatsuoNaofumi Nishida
    • Yusuke OgataKoichi TanakaNobuaki TakahashiKenji MatsuoNaofumi Nishida
    • F16D31/02F16H61/00F16H61/02F16H61/662
    • F16H61/0031F16H61/0206F16H61/66259F16H2061/66286
    • A hydraulic device includes a switch-over valve 1140 provided at a section of a sub-passage 1105 located downstream of a location where a first bypass passage 1117 is connected and located upstream of a primary regulator 1110. The switch-over valve 1140 is switched between a blocked state, where supply of hydraulic oil to a section of the sub-passage 1105 located downstream of the switch-over valve 1140 is blocked, and a communication state, where supply of hydraulic oil to the section of the sub-passage 1105 located downstream of the switch-over valve 1140 is permitted. In the hydraulic device, when the switch-over valve 1140 is switched to the communication state, as a discharge performance of a main pump 1102 increases, a first check valve 1118 closes. Supply paths for hydraulic oil discharged from the sub-pump 1103 are automatically switched in accordance with the discharge performance of the main pump 1102. When the switch-over valve 1140 is switched to the blocked state, the first check valve 1118 opens and hydraulic oil discharged from the sub-pump 1103 is introduced into a main passage 1104.
    • 液压装置包括设置在位于第一旁通通道1117连接并位于主调节器1110的上游的位置下游的子通道1105的部分处的切换阀1140.切换阀1140被切换 在向位于切换阀1140下游的子通道1105的一部分供应液压油的堵塞状态之间,以及连通状态,其中向子通道1105的部分供应液压油 位于切换阀1140的下游。 在液压装置中,当切换阀1140切换到通信状态时,随着主泵1102的排出性能的增加,第一止回阀1118关闭。 从副泵1103排出的液压油的供给路径根据主泵1102的排出性能自动切换。当切换阀1140切换到阻塞状态时,第一止回阀1118打开,液压油 从副泵1103排出的空气被引入主通路1104。