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    • 113. 发明授权
    • Reception synchronization apparatus and demodulating apparatus using the same
    • 接收同步装置及其解调装置
    • US06999406B2
    • 2006-02-14
    • US10010681
    • 2001-12-05
    • Hiroaki TakahashiMitsuhiro Suzuki
    • Hiroaki TakahashiMitsuhiro Suzuki
    • H04J11/00
    • H04B7/2687H04L27/2662H04L27/2678
    • A reception synchronization apparatus capable of achieving precise synchronization of an OFDM signal including a frame guard added to the OFDM signal includes a multiplier for calculating the correlation between a received OFDM signal and an OFDM signal delayed by a delay circuit; a moving integration circuit for adding a signal from the multiplier over a guard period; n frame guard removing circuits, which respectively receive a signal from the moving integration circuit, remove the frame guard period from the received signal, and output a resultant signal; n interval integrators for cumulatively adding signals outputted from the frame guard removing circuits; and a detection circuit for detecting a maximum peak from the results from the n interval integrators and generating a detection signal indicating a synchronization timing position corresponding to the detected maximum peak position.
    • 能够实现包括添加到OFDM信号中的帧保护的OFDM信号的精确同步的接收同步装置包括:乘法器,用于计算接收到的OFDM信号与由延迟电路延迟的OFDM信号之间的相关性; 移动积分电路,用于在保护周期内添加来自乘法器的信号; 分别从移动积分电路接收信号的n帧保护去除电路从接收信号中去除帧保护期,并输出合成信号; n个间隔积分器,用于累加从帧保护去除电路输出的信号; 以及检测电路,用于根据来自n个间隔积分器的结果检测最大峰值,并产生指示与检测到的最大峰值位置相对应的同步定时位置的检测信号。
    • 114. 发明授权
    • Optical receiving circuit and optical communication device
    • 光接收电路和光通信设备
    • US06760552B1
    • 2004-07-06
    • US09532420
    • 2000-03-23
    • Akio TajimaHiroaki TakahashiSoichiro ArakiNaoya HenmiYoshihiko SuemuraYoshiharu MaenoSeigo Takahashi
    • Akio TajimaHiroaki TakahashiSoichiro ArakiNaoya HenmiYoshihiko SuemuraYoshiharu MaenoSeigo Takahashi
    • H04B1006
    • H04B10/6931
    • An optical receiving circuit 1 is composed of a preamplifier circuit 2, an output differential amplifier 3 and a mean value holding circuit 4. The optical receiving circuit 1 is connected to a photodetector 5 for receiving an input optical signal and outputting current. For the preamplifier circuit 2, a transimpedance type circuit may also be used. The preamplifier circuit 2 comprises a feedback resistor 21 and a resistor for detecting output voltage 22, the transimpedance gain is 55 dB &OHgr; and 3 dB bandwidth when the photodetector 5 the capacity of which is 0.2 pF is connected to its output is 8 GHz. The output differential amplifier 3 discriminates and regenerates data by regulating reference voltage Vref between the high level and the low level of the amplitude of an input signal. The mean value holding circuit 4 includes a sample-hold circuit 41 and capacity 42 for holding the mean value of voltage output from the preamplifier circuit 2. As a CR time constant based upon the capacity 42 and the resistor for detection 22 is 1 ns., the mean value level of a received signal can be detected in approximately one byte of the data of 10 Gb/s. The sample-hold circuit 41 samples the detected mean value level according to a sampling pulse from an external device and holds it. The output of the sample-hold circuit 41 is used for the reference voltage of the differential amplifier 3.
    • 光接收电路1由前置放大电路2,输出差分放大器3和平均值保持电路4组成。光接收电路1连接到用于接收输入光信号并输出​​电流的光电检测器5。 对于前置放大器电路2,也可以使用跨阻型电路。 前置放大器电路2包括反馈电阻器21和用于检测输出电压22的电阻器,当其电容为0.2pF的光电检测器5连接到其输出端时,跨阻增益为55dBΩ和3dB带宽为8GHz。 输出差分放大器3通过调节输入信号的幅度的高电平和低电平之间的参考电压Vref来识别和再生数据。 平均值保持电路4包括采样保持电路41和用于保持从前置放大器电路2输出的电压的平均值的电容42.由于基于电容42和检测电阻22的CR时间常数为1ns。 可以在10Gb / s的数据的大约一个字节中检测接收信号的平均值电平。 采样保持电路41根据来自外部设备的采样脉冲对检测到的平均值电平进行采样并保持。 采样保持电路41的输出用于差分放大器3的参考电压。
    • 117. 发明授权
    • Method of and system for distributing digital audio image data
    • 数字音频图像数据的分配方法和系统
    • US5699360A
    • 1997-12-16
    • US597967
    • 1996-02-07
    • Masami NishidaTakashi TakeuchiHiroaki TakahashiMasayuki InoueHitoshi AkiyamaMasakazu Hamaguchi
    • Masami NishidaTakashi TakeuchiHiroaki TakahashiMasayuki InoueHitoshi AkiyamaMasakazu Hamaguchi
    • H04N5/46H04N7/08H04N7/081H04N7/10H04N7/18H04N19/00H04N19/423H04N19/46H04N19/65H04N19/70H04N19/89H04N21/231H04N21/2365H04J3/12
    • H04H20/30
    • Digitally-compressed audio and image data of a plurality of programs (logical channels) are distributed and superimposed for every horizontal synchronizing signal period together with identification information of each of the programs in place of a luminance signal of an analog video signal of each of physical channels. Each of the physical channels is superimposed in its frequency and distributed from a signal transmission facility of a broadcasting station. At the receiving side, a desired physical analog channel is tuned and the compressed digital audio and image data superimposed on the tuned video signal are selected and taken as desired logical channel data in reference to program identification information, and the compressed digital audio and image data are decoded to obtain their original audio and moving images. With such an arrangement as above, in an existing CATV system, a mere insertion of an encoder unit into a transmission side and a decoder unit into a receiving side, without improving a characteristic of an analog video signal distribution system such as a cable or the like, respectively, enables a greater number of programs to be supplied correspondingly by the amount of digital compression.
    • 对于每个水平同步信号周期,多个节目(逻辑信道)的数字压缩音频和图像数据与每个节目的识别信息一起被分配和叠加,代替每个节目的每个物理的模拟视频信号的亮度信号 频道 每个物理信道以其频率叠加并从广播电台的信号传输设备分发。 在接收侧,调谐期望的物理模拟通道,并且参考节目识别信息选择叠加在调谐视频信号上的压缩数字音频和图像数据作为期望的逻辑信道数据,并且压缩的数字音频和图像数据 被解码以获得其原始音频和运动图像。 通过上述这样的布置,在现有的CATV系统中,仅将编码器单元插入发送侧,将解码器单元插入到接收侧,而不改进诸如电缆或模拟视频信号分配系统的特性 分别使得能够相应地通过数字压缩量来提供更多数量的节目。
    • 118. 发明授权
    • Interactive program selecting system
    • 交互式程序选择系统
    • US5699106A
    • 1997-12-16
    • US581456
    • 1995-12-29
    • Yukari MatsubaraToshiyuki OdaHiroaki TakahashiTakashi Takeuchi
    • Yukari MatsubaraToshiyuki OdaHiroaki TakahashiTakashi Takeuchi
    • H04N5/44H04N5/445H04N7/14
    • H04N21/482H04N5/44543H04N7/16
    • An interactive program selecting system uses a plurality of channels (broadcasting signals) including a channel dedicated to a menu and has a tuner for receiving a broadcasting signal, a menu screen information extractor for extracting menu screen information, a display data memory for storing display data of menu screen information, a control data memory for storing control data such as a menu screen information number and moving information, a decoder for converting digital data into display data, a display unit, an RC (remote controller) for designating a menu selecting operation by a user, an RC receiver for receiving an RC signal, and a menu selection executing controller responsive to a operation command by the user to control the tuner and the menu screen information extractor.
    • 交互式节目选择系统使用包括专用于菜单的频道的多个频道(广播信号),并具有用于接收广播信号的调谐器,用于提取菜单画面信息的菜单画面信息提取器,用于存储显示数据的显示数据存储器 菜单屏幕信息的控制数据存储器,用于存储诸如菜单屏幕信息号和移动信息的控制数据的控制数据存储器,用于将数字数据转换为显示数据的解码器,显示单元,用于指定菜单选择操作的RC(遥控器) 用户接收用于接收RC信号的RC接收器,以及响应于用户控制调谐器和菜单画面信息提取器的操作命令的菜单选择执行控制器。