公开(公告)号：US5548619A

公开(公告)日：1996-08-20

申请号：US374915

申请日：1995-01-19

申请人： Yoshio Horiike ,  Yasuo Yoshimura ,  Yoshiyuki Yokoajiro ,  Terue Matsumura ,  Makoto Hasegawa ,  Masahiro Mimura

发明人： Yoshio Horiike ,  Yasuo Yoshimura ,  Yoshiyuki Yokoajiro ,  Terue Matsumura ,  Makoto Hasegawa ,  Masahiro Mimura

IPC分类号： H04B1/26 ,  H04L27/152 ,  H04L27/227 ,  H04L27/06

CPC分类号： H04L27/1525 ,  H04L27/2273

摘要： In a radio receiver apparatus of an orthogonal detection type, a voltage controlled first local oscillator generates a first local oscillation signal, and mixers mix an inputted reception signal with the first local oscillation signal and a 90.degree. shifted signal thereof, respectively, the mixed signals respectively being passed through first and second band-pass filters to obtain desired first intermediate frequency signals. Further, a second local oscillator generates a second local oscillation signal. Further mixers mixes the first intermediate frequency signals from the first and second band-pass filters with the second local oscillation signal and a 90.degree. shifted signal thereof, respectively. Then there is calculated either one of a sum of and a difference between the resulting mixed signals, the calculated signal being passed through a third band-pass filter to obtain a second intermediate frequency signal to be demodulated. Furthermore, an average frequency detector detects an average frequency of the second intermediate frequency signal for a predetermined time interval, and a frequency correction circuit controls the first local oscillation frequency of the first local oscillation signal based on the detected average frequency.

摘要翻译： 在正交检测型的无线电接收机装置中，电压控制的第一本地振荡器产生第一本地振荡信号，并且混频器将输入的接收信号与第一本地振荡信号及其90°移位信号分别混合，混合信号 分别通过第一和第二带通滤波器以获得期望的第一中频信号。 此外，第二本地振荡器产生第二本地振荡信号。 另外的混频器将来自第一和第二带通滤波器的第一中频信号与第二本地振荡信号和其90度移位信号分别混合。 然后，计算得到的混合信号之和的和之一，计算出的信号通过第三带通滤波器以获得待解调的第二中频信号。 此外，平均频率检测器以预定时间间隔检测第二中频信号的平均频率，并且频率校正电路基于检测到的平均频率来控制第一本地振荡信号的第一本地振荡频率。

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。

公开(公告)号：US5781588A

公开(公告)日：1998-07-14

申请号：US548373

申请日：1995-11-01

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.

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。

公开(公告)号：US5844632A

公开(公告)日：1998-12-01

申请号：US44956

申请日：1998-03-20

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.

公开(公告)号：US5640428A

公开(公告)日：1997-06-17

申请号：US555407

申请日：1995-11-09

申请人： Katsuaki Abe ,  Masahiro Mimura ,  Makoto Hasegawa ,  Kazunori Watanabe ,  Katsushi Yokozaki

发明人： Katsuaki Abe ,  Masahiro Mimura ,  Makoto Hasegawa ,  Kazunori Watanabe ,  Katsushi Yokozaki

IPC分类号： H04L27/152 ,  H03D3/00 ,  H04L27/14

CPC分类号： H04L27/1525

摘要： In a first direct conversion receiver for demodulating I and Q signals, having a quadrature relation therebetween, obtained from a received FSK signal through a direct conversion, a first D FF latches a level of the I signal when a sign condition of I and Q signals moves from the same to different sign conditions, a second D FF latches a level of the Q signal when the sign condition of the I and Q signals moves from the different to same sign condition and EXCLUSIVE OR operations are made among the I and Q signals and the outputs of the first and second D FFs to provide a frequent data judgement to improve a receiving sensitivity of an FSK signal having a relative low modulation index. In a second direct conversion receiver, a sign change in the Q signal is detected by a first edge detection circuit 17, a first D FF holds the level of the I signal, and an EXCLUSIVE OR circuit provides a first demodulation result. A sign change in the I signal is detected by a second edge detection circuit 17, a second D FF holds the level of the Q signal, an EXCLUSIVE OR circuit provides a second demodulation result and a subtracting circuit combines the first and second demodulation results. An earlier change detection circuit also combines the first and second demodulation results with a delay in the first and second demodulation results reduced.

摘要翻译： 在用于通过直接转换从接收的FSK信号获得的具有正交关系的用于解调I和Q信号的第一直接转换接收机中，当I和Q信号的符号条件时，第一D FF锁存I信号的电平 从相同状态移动到不同的符号状态，当I和Q信号的符号条件从不同的符号状态移动到相同的符号条件时，第二D FF锁存Q信号的电平，并且在I和Q信号之间进行EXCLUSIVE OR运算 以及第一和第二D FF的输出以提供频繁的数据判断，以提高具有相对较低调制指数的FSK信号的接收灵敏度。 在第二直接变换接收机中，Q信号的符号改变由第一边缘检测电路17检测，第一D FF保持I信号的电平，并且EXCLUSIVE OR电路提供第一解调结果。 I信号的符号变化由第二边缘检测电路17检测，第二D FF保持Q信号的电平，EXCLUSIVE OR电路提供第二解调结果，减法电路组合第一和第二解调结果。 较早的改变检测电路还将第一和第二解调结果与减少的第一和第二解调结果中的延迟相结合。

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。

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。

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。

公开(公告)号：US5533045A

公开(公告)日：1996-07-02

申请号：US191690

申请日：1994-02-04

申请人： Makoto Hasegawa ,  Naoki Adachi ,  Masahiro Mimura ,  Hirohide Hirabayashi ,  Hideko Sakai

发明人： Makoto Hasegawa ,  Naoki Adachi ,  Masahiro Mimura ,  Hirohide Hirabayashi ,  Hideko Sakai

IPC分类号： H04B1/707 ,  H04B1/69

CPC分类号： H04B1/707 ,  H04B2201/70715

摘要： A mobile unit identifying system comprises: an interrogator having: a spread spectrum signal generation circuit for generating a spread spectrum coding signal using a predetermined pseudo noise signal; and a transmitting antenna for transmitting the spread spectrum coding signal; and a responder having: a memory for storing data; and a modulation unit for modulating radio signals including the transmitted spread spectrum coding signal with the data, the interrogator further comprising: a receiving antenna for receiving the modulated radio signals; and a mixer for mixing the received radio signals with the spread spectrum signal to detect the data. The responder has one or two antennas for receiving or reflecting the spread spectrum coding signal with modulation using a predetermined data. Phase adjusting circuits may be provided in both interrogator and responder to distinguished from reflected waves from reflective objects other than the responder. The responding signal from the responder is distinguished from the reflected waves from the reflective objects through a polarizing transmitting or receiving technique.

摘要翻译： 移动单元识别系统包括：询问器，具有：扩频信号生成电路，用于使用预定的伪噪声信号产生扩频编码信号; 以及发送天线，用于发送扩频编码信号; 以及响应者具有：用于存储数据的存储器; 以及调制单元，用于利用所述数据调制包括所述发送的扩频编码信号的无线电信号，所述询问器还包括：接收天线，用于接收调制的无线电信号; 以及混合器，用于将接收到的无线电信号与扩展频谱信号混合以检测数据。 应答器具有一个或两个天线，用于使用预定数据进行调制来接收或反射扩频编码信号。 可以在询问器和应答器中提供相位调整电路，以区分来自反应器以外的反射物体的反射波。 来自响应者的响应信号通过偏振发射或接收技术与来自反射物体的反射波不同。