会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 1. 发明授权
    • Disk player
    • 磁盘播放器
    • US5506830A
    • 1996-04-09
    • US106129
    • 1993-08-12
    • Seiichiroh OhishiAkio YamakawaTakashi SekiTetsuhiro Shiomi
    • Seiichiroh OhishiAkio YamakawaTakashi SekiTetsuhiro Shiomi
    • G11B7/085G11B17/04G11B21/02G11B17/30
    • G11B17/056G11B7/08594
    • A disk player has a guide member for guiding an optical pickup carrier along both sides of a double-sided disk. In order to prevent interference between the pickup carrier and the periphery of the disk during turning movement of the pickup carrier around the periphery of the disk from one of the upper and lower sides of the disk to the other side, the guide member is shaped like a horseshoe. The guide member includes upper and lower straight sections for guiding the pickup carrier, respectively, along the upper and lower sides of the disc, and an arched section extending vertically around the periphery of the disk and connecting the outer ends of the upper and lower straight sections. The upper and lower straight sections are not parallel to each other, but rather they are inclined in such a fanlike manner that the outer ends are wider apart.
    • 磁盘播放器具有用于沿着双面盘的两侧引导光学拾取器载体的引导构件。 为了防止在将拾取器载体围绕盘的周边从盘的上侧和下侧之一转移到另一侧的转动载体周围移动期间的拾取器载体和盘周边之间的干扰,引导构件形状如 马蹄铁 引导构件包括用于分别沿着盘的上侧和下侧引导拾取器载体的上部和下部直段,以及围绕盘的周边垂直延伸并且连接上部和下部直线的外端的弓形部分 部分。 上部和下部直线段彼此不平行,而是以这样一种扇形的方式倾斜,使得外端分开较宽。
    • 4. 发明申请
    • DIVERSITY RECEIVER AND METHOD
    • 多样性接收者和方法
    • US20070116161A1
    • 2007-05-24
    • US11562657
    • 2006-11-22
    • Kenichi TokoroTakashi Seki
    • Kenichi TokoroTakashi Seki
    • H04L1/02
    • H04L1/0057H04B7/0854H04L1/0052H04L1/06H04L27/2647
    • Respective demodulated outputs from a plurality of branches 11a to 11d are fed to corresponding error correction units 13a to 13d and error-corrected. The error correction units 13a to 13d feed error signals to error determination units 14a to 14d. The error determination units 14a to 14d determine the error-incidence situations of the respective branches 11a to 11d and then output the determination results to a coefficient generation unit 15. Based on the results of determination by the error determination units 14a to 14d, the coefficient generation unit 15 obtains the synthesis coefficients for the respective branch outputs. The synthesis coefficients correspond to the error-incidence situations of the respective branch outputs and are appropriate values including no errors. By synthesizing the respective branch outputs by use of the synthesis coefficients, error-free data can be reproduced.
    • 来自多个分支11a至11d的相应解调输出被馈送到相应的纠错单元13a至13d并进行纠错。 误差校正单元13a至13d将误差信号馈送到错误确定单元14a至14d。 错误确定单元14a至14d确定各个分支11a至11d的错误发生情况,然后将确定结果输出到系数生成单元15.基于错误确定单元14a的确定结果 到14天,系数生成单元15获得各分支输出的合成系数。 合成系数对应于各个分支输出的误差发生情况,并且是不包括错误的适当值。 通过使用合成系数合成各个分支输出,可以再现无错误的数据。
    • 5. 发明授权
    • OFDM transmit signal receiver
    • US06983027B2
    • 2006-01-03
    • US09987881
    • 2001-11-16
    • Takashi SekiTakeshi Koyama
    • Takashi SekiTakeshi Koyama
    • H03K9/00
    • H04L27/2647H04L1/20
    • A demodulation circuit receives an OFDM transmit signal containing an information carrier, an additive-information transmission carrier, and a reception-synchronization pilot signal to convert these carriers and signal into frequency-axial data. The information carrier transmits information data. The additive-information transmission carrier and the reception-synchronization pilot signal have a lower multi-valued modulation degree than the information carrier. A differential detection circuit conducts detection processing by using a detection-subject symbol of a plurality of symbols indicated at a predetermined interval in the same frequency range and a symbol ahead that detection-subject symbol by a predetermined time in either one output of the additive-information transmission carrier and the reception-synchronization pilot signal output from the demodulation circuit. A first S/N ratio generating circuit generates an S/N ratio based on a detection output provided from the differential detection circuit. The S/N ratio indicates the reception quality of the OFDM transmit signal.
    • 7. 发明授权
    • Orthogonal frequency division multiplexing transmission system and
transmitter and receiver therefor
    • 正交频分复用传输系统及其发射机和接收机
    • US5771224A
    • 1998-06-23
    • US619211
    • 1996-03-21
    • Takashi SekiNoboru TagaShigeru OkitaTatsuya Ishikawa
    • Takashi SekiNoboru TagaShigeru OkitaTatsuya Ishikawa
    • H04L27/18H04J11/00H04L5/02H04L27/26H04L27/34
    • H04L27/2657H04L27/18H04L27/2613H04L27/2675H04L27/34H04L25/0232H04L25/03159H04L27/2662H04L5/0048
    • A transmission system is disclosed which permits the receiving end to demodulate multi-valued modulated symbols successfully under fading conditions and reduces the amount of transmitted reference data to improve data transmission efficiency. At the transmitting end, a multiplexing section, a modulating section, and a transmitting section are provided. In transmitting an OFDM transmission frame, null symbols and reference symbols are placed in the beginning portion of the frame and QPSK symbols are placed in an information symbol data region in the frame with equal spacings in time and frequency. At the receiving end, a receiving section, a demodulation section, an equalizing section, and a demultiplexing section are provided. An error detector detects amplitude and phase errors of each carrier from the reference symbols, and a variation detector detects variations in the amplitude and phase of a received signal from the QPSK symbols. The carrier amplitude and phase errors are corrected by a correction information producing section on the amplitude and phase variations of the received signal detected by the variation detector to produce correction information. The equalizing section equalizes the demodulated symbol data according to the correction information.
    • 公开了一种传输系统,其允许接收端在衰落条件下成功解调多值调制符号,并减少传输的参考数据量以提高数据传输效率。 在发送端,提供复用部分,调制部分和发送部分。 在发送OFDM传输帧时,将空符号和参考符号放置在帧的开始部分,并且将QPSK符号放置在帧中的时间和频率上等间隔的信息符号数据区域中。 在接收端设置有接收部分,解调部分,均衡部分和解复用部分。 误差检测器从参考符号检测每个载波的幅度和相位误差,并且变化检测器检测来自QPSK符号的接收信号的幅度和相位的变化。 载波振幅和相位误差由校正信息产生部分对由变化检测器检测到的接收信号的幅度和相位变化进行校正,以产生校正信息。 均衡部根据校正信息对解调符号数据进行均衡。
    • 8. 发明授权
    • OFDM synchronization demodulation circuit
    • OFDM同步解调电路
    • US5602835A
    • 1997-02-11
    • US341976
    • 1994-11-16
    • Takashi SekiYasushi SugitaTatsuya Ishikawa
    • Takashi SekiYasushi SugitaTatsuya Ishikawa
    • H04L27/38H04J11/00H04L7/00H04L27/22H04L27/26
    • H04L27/2665H04L27/2657H04L27/2662
    • An OFDM synchronization demodulation circuit includes a recovery circuit, an orthogonal axis demodulation circuit, a first and second delay circuit, a correlation calculation circuit, a guard timing detection circuit, and an OFDM signal demodulation circuit. The receiving circuit receives an orthogonal modulated wave based on an orthogonal frequency division multiplex (OFDM) modulated signal having an available symbol period and a guard period, where the guard period of the orthogonal modulated wave is based on a part of the available symbol period. The orthogonal axes demodulation circuit demodulates an in-phase axis detection signal and an orthogonal axis detection signal for the OFDM modulated wave from the receiving circuit using orthogonal detection. The first delay circuit delays the in-phase axis detection signal by the available symbol period, and the second delay circuit delays the orthogonal axis detection signal by the available symbol period. The correlation calculation circuit calculates coefficients of the correlations of the in-phase axis detection signal and the orthogonal axis detection signal from the orthogonal demodulation circuit with the output of the first or the second delay circuits. The guard timing detection circuit detects a timing of the guard period in the demodulation outputs from the orthogonal demodulation circuit. The OFDM signal demodulation circuit demodulates the OFDM modulated signal by extracting the available symbol period signal only from the demodulated output of the orthogonal demodulation circuit using the timing signal.
    • OFDM同步解调电路包括恢复电路,正交轴解调电路,第一和第二延迟电路,相关计算电路,保护定时检测电路和OFDM信号解调电路。 接收电路基于具有可用符号周期和保护周期的正交频分复用(OFDM)调制信号接收正交调制波,其中正交调制波的保护周期基于可用符号周期的一部分。 正交轴解调电路使用正交检测来解调来自接收电路的OFDM调制波的同相轴检测信号和正交轴检测信号。 第一延迟电路将同相轴检测信号延迟可用符号周期,第二延迟电路将正交轴检测信号延迟可用符号周期。 相关计算电路将来自正交解调电路的同相轴检测信号和正交轴检测信号的相关性的系数与第一或第二延迟电路的输出进行计算。 保护定时检测电路检测来自正交解调电路的解调输出中的保护时段的定时。 OFDM信号解调电路通过使用定时信号仅从正交解调电路的解调输出提取可用符号周期信号来解调OFDM调制信号。