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    Mobile television receiver
    1.
    发明授权
    Mobile television receiver 失效
    移动电视接收机

    公开(公告)号：US5986720A

    公开(公告)日：1999-11-16

    申请号：US845442

    申请日：1997-04-25

    申请人： Takaaki Kishigami ,  Masahiro Mimura ,  Makoto Hasegawa ,  Masahiko Nakamura ,  Yoshinori Takagi ,  Masanobu Kanaya

    发明人： Takaaki Kishigami ,  Masahiro Mimura ,  Makoto Hasegawa ,  Masahiko Nakamura ,  Yoshinori Takagi ,  Masanobu Kanaya

    IPC分类号： H04N5/21 ,  H04N5/44 ,  H04N21/414 ,  H04N21/442 ,  H04N5/455

    CPC分类号： H04N5/44 ,  H04N21/41407 ,  H04N21/44209 ,  H04N5/21

    摘要： A mobile television receiver includes a TV tuner demodulating an incoming TV signal into a first video signal. A first horizontal sync signal is separated from the first video signal. Detection is made as to a quality of an image represented by the first video signal. A second horizontal sync signal is generated. Detection is made as to a difference between a phase of the first horizontal sync signal and a phase of the second horizontal sync signal. The phase of the second horizontal sync signal is controlled in response to the detected phase difference between the first horizontal sync signal and the second horizontal sync signal so that the second horizontal sync signal will be locked in phase and frequency to the first horizontal sync signal. A memory unit stores the first video signal in response to a memory control signal, and outputs the stored first video signal as a second video signal. The memory control signal is generated in response to the detected image quality. The second video signal is displayed in response to the second horizontal sync signal.

    摘要翻译： 移动电视接收机包括将输入的TV信号解调为第一视频信号的TV调谐器。 第一水平同步信号与第一视频信号分离。 对由第一视频信号表示的图像的质量进行检测。 产生第二水平同步信号。 检测第一水平同步信号的相位与第二水平同步信号的相位之差。 响应于第一水平同步信号和第二水平同步信号之间检测到的相位差来控制第二水平同步信号的相位，使得第二水平同步信号将以相位和频率锁定到第一水平同步信号。 存储单元响应于存储器控制信号存储第一视频信号，并将所存储的第一视频信号作为第二视频信号输出。 响应于检测到的图像质量而产生存储器控制信号。 响应于第二水平同步信号显示第二视频信号。

    Diversity receiving apparatus for a mobile unit
    2.
    发明授权
    Diversity receiving apparatus for a mobile unit 失效
    用于移动单元的分集接收装置

    公开(公告)号：US5777693A

    公开(公告)日：1998-07-07

    申请号：US690904

    申请日：1996-08-01

    申请人： Takaaki Kishigami ,  Masahiro Mimura ,  Makoto Hasegawa ,  Tadaaki Ushiyama ,  Masahiko Nakamura ,  Yoshinori Takagi

    发明人： Takaaki Kishigami ,  Masahiro Mimura ,  Makoto Hasegawa ,  Tadaaki Ushiyama ,  Masahiko Nakamura ,  Yoshinori Takagi

    IPC分类号： H04B7/08 ,  H04N5/44 ,  H04N21/414 ,  H04N21/426 ,  H04N21/438 ,  H04N21/442

    CPC分类号： H04N5/44 ,  H04B7/0811 ,  H04N21/41422 ,  H04N21/4263 ,  H04N21/4383 ,  H04N21/44209

    摘要： In a first diversity receiving apparatus, during an antenna selection operation, one of antennas are selected such that each of antennas successively connected to a receiver for consecutive horizontal retrace periods but for horizontal scanning periods following the horizontal retrace period, the selected antenna showing a largest level at the previous antenna selection operation is connected to the receiver to detect levels derived from respective antennas. The antenna showing a largest level is selected at the current antenna selection operation to receive a radio wave television signal for the following M (a natural number) horizontal scanning cycles. M is changed in accordance with the phasing condition. For example, M is changed according to a speed of vehicle, a field intensity, a frequency of the received television signal, etc. The switching circuit and tuner may be provided doubly to prevent the affection of switching noise. A second apparatus determines the selected antenna by further detecting noise levels derived from the respective antennas during a vertical retrace period. A frequency of switching of antennas for determining the selected antenna is reduced to reduce a switching noise on the reproduced image or in the reproduced sound.

    摘要翻译： 在第一分集接收装置中，在天线选择操作期间，选择天线之一，使得每个天线连续地连接到接收机，用于连续水平回扫周期，但是在水平回扫周期之后的水平扫描周期中，所选择的天线显示最大 先前天线选择操作的电平连接到接收机以检测从相应天线导出的电平。 在当前天线选择操作中选择显示最大电平的天线，以接收用于后续M（自然数）的水平扫描周期的无线电波电视信号。 M根据相位条件而改变。 例如，根据车辆的速度，场强，接收的电视信号的频率等来改变M。可以双重地提供开关电路和调谐器以防止开关噪声的影响。 第二装置通过在垂直回扫期间进一步检测从相应天线导出的噪声水平来确定所选择的天线。 用于确定所选择的天线的天线的切换频率被减小以减少再现图像上的切换噪声或再现的声音。

    Direct-conversion receiver for digital-modulation signal
    5.
    发明授权
    Direct-conversion receiver for digital-modulation signal 有权
    用于数字调制信号的直接转换接收器

    公开(公告)号：US06236690B1

    公开(公告)日：2001-05-22

    申请号：US09332078

    申请日：1999-06-14

    申请人： Masahiro Mimura ,  Makoto Hasegawa ,  Katsushi Yokozaki ,  Hiroyuki Harada ,  Takaaki Kishigami ,  Yasunari Tanaka

    发明人： Masahiro Mimura ,  Makoto Hasegawa ,  Katsushi Yokozaki ,  Hiroyuki Harada ,  Takaaki Kishigami ,  Yasunari Tanaka

    IPC分类号： H04L2714

    CPC分类号： H04B1/30 ,  H03D3/007 ,  H04B17/318

    摘要： A direct-conversion receiver includes a local oscillator for generating a local oscillator signal, a converter circuit for converting a received radio signal into a pair of a baseband I signal and a baseband Q signal in response to the local oscillator signal, a demodulator for demodulating the pair of the baseband I signal and the baseband Q signal into a demodulation-resultant signal which is neither an I signal nor a Q signal, a detector circuit for detecting a difference between a frequency of the local oscillator signal and a frequency of a carrier of the received radio signal, a clock signal generator for generating a first clock signal providing a timing which corresponds to a center of a symbol period, a signal delay device for delaying the first clock signal to provide a second clock signal, and a symbol deciding circuit for deciding a logic state of the demodulation-resultant signal at a timing determined by the second clock signal.

    摘要翻译： 一种直接转换接收机，包括用于产生本地振荡器信号的本地振荡器，用于响应于本地振荡器信号将接收到的无线电信号转换为一对基带I信号和基带Q信号的转换器电路，用于解调的解调器 一对基带I信号和基带Q信号转换成既不是I信号也不是Q信号的解调结果信号，用于检测本地振荡器信号的频率和载波频率之间的差异的检测器电路 接收的无线电信号的时钟信号发生器，用于产生提供对应于符号周期的中心的定时的第一时钟信号的时钟信号发生器，用于延迟第一时钟信号以提供第二时钟信号的信号延迟装置，以及符号决定 电路，用于在由第二时钟信号确定的定时处决定解调结果信号的逻辑状态。

    FSK signal receiver
    6.
    发明授权
    FSK signal receiver 失效
    FSK信号接收机

    公开(公告)号：US5987075A

    公开(公告)日：1999-11-16

    申请号：US988209

    申请日：1997-12-10

    申请人： Katsuaki Abe ,  Takaaki Kishigami ,  Masahiro Mimura ,  Makoto Hasegawa ,  Katsushi Yokozaki ,  Yoichi Yamaki ,  Toshiyuki Tsumura ,  Hiroshi Katayama

    发明人： Katsuaki Abe ,  Takaaki Kishigami ,  Masahiro Mimura ,  Makoto Hasegawa ,  Katsushi Yokozaki ,  Yoichi Yamaki ,  Toshiyuki Tsumura ,  Hiroshi Katayama

    IPC分类号： H03G3/20 ,  H04L25/06 ,  H04L27/14

    CPC分类号： H03G3/3068 ,  H04L25/061

    摘要： An FSK signal receiver includes an amplifier which amplifies a first FSK signal at an adjustable gain. A frequency converter converts an output signal from the amplifier into a second FSK signal having a frequency lower than a frequency of the first FSK signal. A demodulator demodulates the second FSK signal into a baseband signal. A bit-state detector detects a bit state from the baseband signal in response to a threshold. A calculator calculates a number of times of occurrence of a fact that the baseband signal moves across the threshold during a given time. The gain of the amplifier is adjusted in response to the number of times which is calculated by the calculator.

    摘要翻译： FSK信号接收机包括放大器，其以可调增益放大第一FSK信号。 变频器将来自放大器的输出信号转换成具有低于第一FSK信号的频率的频率的第二FSK信号。 解调器将第二FSK信号解调为基带信号。 位状态检测器响应于阈值从基带信号检测比特状态。 计算器计算在给定时间内基带信号在阈值上移动的事实的发生次数。 响应于由计算器计算的次数来调节放大器的增益。

    Automatic frequency control apparatus for FSK receiver and FSK receiver including the same
    7.
    发明授权
    Automatic frequency control apparatus for FSK receiver and FSK receiver including the same 失效
    用于FSK接收机和FSK接收机的自动频率控制装置包括相同的

    公开(公告)号：US5633898A

    公开(公告)日：1997-05-27

    申请号：US360648

    申请日：1994-12-21

    申请人： Takaaki Kishigami ,  Katsuaki Abe ,  Masahiro Mimura ,  Makoto Hasegawa ,  Katsushi Yokozaki

    发明人： Takaaki Kishigami ,  Katsuaki Abe ,  Masahiro Mimura ,  Makoto Hasegawa ,  Katsushi Yokozaki

    IPC分类号： H04L27/152 ,  H04L27/14 ,  H03D3/18 ,  H04L27/06 ,  H04L27/10

    CPC分类号： H04L27/1525

    摘要： A first AFC apparatus receives and detects I and Q signals from a received first FSK signal with a local osc signal; demodulates the I and Q signals; F/V-converts I or/and Q signals into a voltage; compares it with a reference; and detects a frequency deviation direction of the local osc signal from the carrier signal according to the results of comparing and the demodulating. The local osc frequency is controlled by a given amount according to the result of the frequency deviation direction detection. A second AFC apparatus receives and detects I and Q signals using a first osc signal; FSK-modulates the I and Q signals with a second local osc signal having a lower frequency than the first local osc signal; and compares the frequency of the second FSK signal and the second local osc signal to supply a demodulation result. A frequency control for the first local osc signal is obtained by an averaging circuit averaging the modulation result. The F/V converter used in this apparatus has various modification and amplitude limiter may be provided as necessary. The averaging may be effected for a given data period of the first FSK signal. Power consumption can be reduced by selectively supplying a power with/without a holing circuit. FSK receivers use these automatic frequency control apparatus are also disclosed.

    摘要翻译： 第一AFC设备接收并检测来自接收到的具有本地osc信​​号的第一FSK信号的I和Q信号; 解调I和Q信号; 将I /或Q信号F / V转换为电压; 将其与参考进行比较; 并且根据比较结果和解调来检测来自载波信号的本地振荡信号的频率偏差方向。 根据频偏方向检测的结果，本地振荡频率由给定量控制。 第二AFC设备使用第一osc信号接收和检测I和Q信号; FSK调制具有比第一本地osc信​​号低的频率的第二本地振荡信号的I和Q信号; 并且比较第二FSK信号和第二本地osc信​​号的频率以提供解调结果。 通过对调制结果进行平均的平均电路来获得第一局部振荡信号的频率控制。 该装置中使用的F / V转换器具有各种修改，并且可以根据需要提供幅度限制器。 对于第一FSK信号的给定数据周期可以进行平均。 通过有选择地提供带有/不带有孔的电路的电力可以降低功耗。 FSK接收机使用这些自动频率控制装置也被公开。

    Direction estimating apparatus, directivity controlling antenna apparatus, and direction estimating method
    8.
    发明授权
    Direction estimating apparatus, directivity controlling antenna apparatus, and direction estimating method 有权
    方向估计装置，方向性控制天线装置和方向估计方法

    公开(公告)号：US06333713B1

    公开(公告)日：2001-12-25

    申请号：US09639996

    申请日：2000-08-17

    申请人： Youichi Nakagawa ,  Masahiro Mimura ,  Takaaki Kishigami ,  Makoto Hasegawa ,  Takashi Fukagawa

    发明人： Youichi Nakagawa ,  Masahiro Mimura ,  Takaaki Kishigami ,  Makoto Hasegawa ,  Takashi Fukagawa

    IPC分类号： G01S352

    CPC分类号： G01S3/74 ,  H01Q3/26 ,  H01Q3/2605

    摘要： Array elements 111-1 to 111-n of array antenna 101 are arranged at respective different heights from a ground so as not to overlap to each other in a vertical direction. Received frequency conversion section 102 converts a radio frequency signal received at each of the array elements 111-1 to 111-n of array antenna 101 into an intermediate frequency signal or baseband signal. A/D conversion section 103 converts an analog signal output from received frequency conversion section 102 into a digital signal using a proper sampling frequency. Direction estimating section 105 estimates directions of an arrival radio signal in a horizontal plane and vertical plane using received digital signals obtained in A/D conversion section 103. It is thereby possible to suppress increases in the number of array elements and computation amount, and to improve estimation accuracy in the vertical direction and resolution at the time a plurality of signals arrive.

    摘要翻译： 阵列天线101的阵列元件111-1至111-n被布置在与地面不同的高度处，以便在垂直方向上彼此不重叠。 接收频率转换部分102将在阵列天线101的每个阵列元件111-1至111-n处接收的射频信号转换为中频信号或基带信号。 A / D转换部分103使用适当的采样频率将从接收频率转换部分102输出的模拟信号转换成数字信号。 方向估计部105使用在A / D转换部103中获得的接收数字信号来估计水平面和垂直面中的到达无线信号的方向。由此，可以抑制数组元素的数量的增加和计算量， 提高多个信号到达时的垂直方向的估计精度和分辨率。

    Direct-conversion receiver for digital-modulation signal with signal strength detection
    9.
    发明授权
    Direct-conversion receiver for digital-modulation signal with signal strength detection 失效
    具有信号强度检测功能的数字调制信号直接转换接收器

    公开(公告)号：US5617451A

    公开(公告)日：1997-04-01

    申请号：US302982

    申请日：1994-09-12

    申请人： Masahiro Mimura ,  Makoto Hasegawa ,  Katsushi Yokozaki ,  Hiroyuki Harada ,  Takaaki Kishigami ,  Yasunari Tanaka

    发明人： Masahiro Mimura ,  Makoto Hasegawa ,  Katsushi Yokozaki ,  Hiroyuki Harada ,  Takaaki Kishigami ,  Yasunari Tanaka

    IPC分类号： H03D3/00 ,  H04B1/30 ,  H04B17/00 ,  H03D1/00

    CPC分类号： H04B1/30 ,  H03D3/007 ,  H04B17/318

    摘要： A direct-conversion receiver includes a direct-conversion demodulator. A first device detects a strength of a received signal. A clock signal generator outputs a clock signal in response to a reception start signal. The clock signal has a frequency corresponding to a symbol rate or higher. A second device samples an output signal of the demodulator at a timing determined by the clock signal. A third device samples an output signal of the first device at a timing determined by the clock signal. A fourth device stores "n" output signals of the second device which relate to a signal periodically transmitted from a transmitting station "n" times, wherein "n" denotes a natural number equal to 2 or greater. A fifth device stores "n" output signals of the third device which correspond in timing to the "n" output signals of the second device. A sixth device reads out signals from the fourth device, and reads out signals from the fifth device. The sixth device weights the signals read out from the fourth device in response to the signals read out from the fifth device. A seventh device combines output signals of the sixth device.

    摘要翻译： 直接转换接收机包括直接转换解调器。 第一设备检测接收信号的强度。 时钟信号发生器响应于接收开始信号输出时钟信号。 时钟信号具有对应于符号率或更高的频率。 第二设备在由时钟信号确定的定时处对解调器的输出信号进行采样。 第三设备在由时钟信号确定的定时采样第一设备的输出信号。 第四设备存储与从发送站“n”周期性地发送的信号相关的第二设备的“n”个输出信号，其中“n”表示等于2或更大的自然数。 第五装置将与定时对应的第三装置的“n”个输出信号存储到第二装置的“n”个输出信号。 第六设备从第四设备读出信号，并从第五设备读出信号。 响应于从第五装置读出的信号，第六装置对从第四装置读出的信号进行加权。 第七设备组合第六设备的输出信号。