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    • 2. 发明申请
    • MOBILE SATELLITE COMMUNICATION TERMINAL
    • 移动卫星通信终端
    • WO2001037367A1
    • 2001-05-25
    • PCT/JP2000007993
    • 2000-11-13
    • NEC CORPORATIONMOCHIZUKI, Takuji
    • NEC CORPORATION
    • H01Q1/24
    • H01Q1/244H01Q1/12H01Q1/245H04B1/3838H04B7/18571
    • A mobile satellite communication terminal which has a ground terminal function for communication through a ground base station (9), and a satellite terminal function for communication through a satellite (10), wherein the mobile satellite communication terminal includes a common section (101) provided with a microphone (104) and a speaker (105), a satellite communication RF/IF section (102) provided with a ground communication antenna (107) and a satellite communication antenna (108), and a hinge (111) for rotatably joining the common section (101) and the satellite communication RF/IF section (102). By adjusting the hinge angle, the common section (101) and the satellite communication RF/IF section (102) are integrated during carrying and ground communication. Further, by adjusting the hinge angle, during satellite communication, the common section (101) and the satellite communication RF/IF section (102) assume a positional relation in which they are rotated through a predetermined angle, and the distance between the head of the user and the satellite communication antenna (108) becomes longer, so that a stabilized radiation pattern is produced.
    • 一种移动卫星通信终端,其具有通过地面基站(9)进行通信的接地终端功能,以及用于通过卫星(10)进行通信的卫星终端功能,其中,移动卫星通信终端包括提供的公共部分(101) 具有麦克风(104)和扬声器(105)的卫星通信RF / IF部分(102)和设置有地面通信天线(107)和卫星通信天线(108)的卫星通信RF / IF部分(102) 公共部分(101)和卫星通信RF / IF部分(102)。 通过调整铰链角度,公共部分(101)和卫星通信RF / IF部分(102)在携带和地面通信期间被集成。 此外,通过调整铰链角度,在卫星通信期间,公共部分(101)和卫星通信RF / IF部分(102)呈现它们被旋转预定角度的位置关系,并且, 用户和卫星通信天线(108)变长,从而产生稳定的辐射图。
    • 5. 发明申请
    • FREQUENCY SYNTHESIZERS
    • 频率合成器
    • WO2000014882A1
    • 2000-03-16
    • PCT/JP1999004713
    • 1999-08-31
    • NEC CORPORATIONSMITH, Gary
    • NEC CORPORATION
    • H03L7/187
    • H03L7/10H03L7/0891H03L7/187
    • A frequency synthesizer suitable for use with a radiotelephone has a voltage controlled oscillator (VCO) (4) in a phase locked loop (PLL). When the synthesizer is switched to a new frequency, a speed-up circuit operates and applies a voltage to the voltage control input of the VCO (4) such that the required frequency is acquired quickly by the VCO (4). The speed-up circuit has a time period difference detector (6) for measuring the time period difference between the reference and feedback frequencies of the PLL, a time-to-voltage converter (7) for obtaining a voltage proportional to the difference in period of the reference and feedback frequencies, and an amplifier (8) for amplifying the output of the converter (7). The output of the amplifier (8) is applied to the VCO (4) via a base of the loop filter (3) of the PLL.
    • 适用于无线电话的频率合成器在锁相环(PLL)中具有压控振荡器(VCO)(4)。 当合成器切换到新频率时,加速电路工作并向VCO(4)的电压控制输入端施加电压,使得所需频率由VCO(4)快速获取。 加速电路具有用于测量PLL的参考和反馈频率之间的时间间隔差的时间差检测器(6),用于获得与时间差成比例的电压的时间 - 电压转换器(7) 的参考和反馈频率,以及用于放大转换器(7)的输出的放大器(8)。 放大器(8)的输出通过PLL的环路滤波器(3)的基极施加到VCO(4)。
    • 6. 发明申请
    • MULTI-FUNCTION UART
    • 多功能UART
    • WO1999059074A1
    • 1999-11-18
    • PCT/JP1999002376
    • 1999-05-07
    • NEC CORPORATIONBOND, Jeffery
    • NEC CORPORATION
    • G06F13/38
    • G06F13/385
    • A multi-function UART (universal asynchronous receiver transmitter) for use in a data processing system, includes an interface (10) for connection to a host CPU bus (20); a transmitter FIFO (11) connected to the interface (10); a parallel-to-serial converter (12) connected to an output of the transmitter FIFO (11) to provide a serial data stream; a pulse shaper (13) for controlling the pulse length of each output pulse of the parallel-to-serial converter (12) according to value of the corresponding serial bit; output selector (14) for selecting one of outputs of the parallel-to-serial converter (12) and the pulse shaper (13); a receiver input stage (15) having a pulse width discriminator (18) and a clock recovery circuit (19); a serial-to-parallel converter (16) connected to an output of the receiver input stage; and a receiver FIFO buffer (17) connected between the serial-to-parallel converter (16) and the interface (10).
    • 一种用于数据处理系统的多功能UART(通用异步接收发射机),包括用于连接主机CPU总线(20)的接口(10)。 连接到所述接口(10)的发射机FIFO(11); 连接到发射器FIFO(11)的输出的并行到串行转换器(12)以提供串行数据流; 脉冲整形器(13),用于根据对应的串行位的值来控制并行到串行转换器(12)的每个输出脉冲的脉冲长度; 输出选择器(14),用于选择并行到串行转换器(12)和脉冲整形器(13)的输出之一; 具有脉冲宽度鉴别器(18)和时钟恢复电路(19)的接收器输入级(15); 连接到接收器输入级的输出的串并转换器(16); 以及连接在串并转换器(16)和接口(10)之间的接收器FIFO缓冲器(17)。