公开(公告)号：EP0015730B1

公开(公告)日：1984-12-27

申请号：EP80300612.1

申请日：1980-02-29

申请人： Nippon Telegraph and Telephone Public Corporation ,  FUJITSU LIMITED

发明人： Fujimura, Noriaki ,  Kinoshita, Tsuneo ,  Aono, Tadashi ,  Kaku, Takashi ,  Tanaka, Yasuya

IPC分类号： H04L3/00 ,  H04L25/49 ,  H04L5/14

CPC分类号： H04L1/0083 ,  H04L5/143 ,  H04L25/4906 ,  H04L27/066

公开(公告)号：EP0015730A1

公开(公告)日：1980-09-17

申请号：EP80300612.1

申请日：1980-02-29

申请人： Nippon Telegraph and Telephone Public Corporation ,  FUJITSU LIMITED

发明人： Fujimura, Noriaki ,  Kinoshita, Tsuneo ,  Aono, Tadashi ,  Kaku, Takashi ,  Tanaka, Yasuya

IPC分类号： H04L3/00 ,  H04L25/49 ,  H04L5/14

CPC分类号： H04L1/0083 ,  H04L5/143 ,  H04L25/4906 ,  H04L27/066

摘要： In the system carrier is continuously transmitted from transmitting side (1,2) to receiving side (4,5).
Outside effective data sending periods continuous "1" bits (ALL MARK, waveform [c] Fig. 2) are sent.
To detect effective data sending periods, a code converter (22) on the transmitting side (1, 2) inverts selected data bits for sending.
The bit coinciding with a send request signal rising to "1" is inverted (waveforms [b] and [d]; Fig. 2), and subsequently any bit which follows four consecutive bits of equal value is inverted whilst the send request signal is "1".
A receiving side (4, 5) detector (45) detects the first inverted bit (first "0" bit) and then detects subsequent inversions. The beginning and continuation of an effective sending period are thereby determined.
When no inversions are detected for a predetermined number of received bits (e.g. 48) it is determined that the period has ended.
A decoder (44) restores the original values to detected inverted bits.

摘要翻译： 在该系统中的载体被连续地从反式发送侧（1,2），以接收侧mitted（4，5）。 ... 外有效的数据发送期间连续 “1” 位（ALL MARK，波形并[c]图2）被发送。 ... 为了检测有效的数据发送期间，码转换器（22）在发送侧（1,2）反转所选择的数据位以供发送。 ... 位与sendRequest将信号上升到“1”一致反转（波形并[b]和[D];图2），并随后跟随同值四个连续比特的任何比特被反转，而 所述sendRequest将信号是“1”。 ... 接收侧（4,5）检测器（45）检测所述第一反转比特（第一个“0”位），然后检测随后的反转。 开始和有效的发送周期的延续是由此确定性开采。 ... 当对于预定数量的接收到的比特（例如48）中没有检测到反转它是确定性的开采确实已结束的时间段。 ... 的解码器（44）恢复到检测invertical比特的原始值。

公开(公告)号：EP0798875A2

公开(公告)日：1997-10-01

申请号：EP97301754.4

申请日：1997-03-17

申请人： FUJITSU LIMITED

发明人： Kaku, Takashi ,  Kawada, Noboru ,  Miyazawa, Hideo ,  Nigaki, Yuri

IPC分类号： H04B3/04

CPC分类号： H04B3/04 ,  H04L25/03885

摘要： A method of controlling a line equalizer such as a modem includes an extracting step (S1) of extracting plural tone signals each superimposed on a transmission signal and having a specific frequency component; a judging step (S2) of judging levels of the extracted tone signals; and a controlling step (S3) of controlling characteristic of a line equalizer which equalizes a receive signal, based on the levels of the judged tone signals. A line equalizer is controlled without performing an exchange of a training signal prior to starting a data transmission and without increasing the amount of hardware of a modem or the like.

摘要翻译： 一种控制诸如调制解调器之类的线路均衡器的方法包括提取步骤（S1），提取每个叠加在传输信号上并具有特定频率分量的多个音调信号; 判断步骤（S2），判断所提取的音调信号的电平; 以及基于所判断的音调信号的电平来控制均衡接收信号的线均衡器的特性的控制步骤（S3）。 在开始数据传输之前，不执行训练信号的交换而不增加调制解调器等的硬件的数量来控制线路均衡器。

公开(公告)号：EP0204308A3

公开(公告)日：1988-11-30

申请号：EP86107506

申请日：1986-06-03

申请人： FUJITSU LIMITED

发明人： Kaku, Takashi ,  Arai, Yasuhiro

IPC分类号： H04L27/06 ,  H04L25/03 ,  H04L07/02

CPC分类号： H04L27/38 ,  H04L7/027 ,  H04L7/046 ,  H04L25/03133 ,  H04L2025/03783

摘要： A multipoint type MODEM communication system having a training device for adapting receiving parameters in a receiving MODEM (101) to a characteristic of a telephone line (300) connected to a sending MODEM in response to a training signal sent from the sending MODEM (201, 211, 222) prior to the reception of data. The training signal includes at least two impulses, a time between them defining the characteristic of the telephone line which should be adjusted in the receiving MODEM. The training signal may be superimposed on a tone and a timing signal, which are used for gain control and pull-in synchronization, and the impulses used for equalization and carrier-phase-control. The training signal also may include the tone, the timing signal, and the impulses in series. Additional guard impulses may be added prior to and/or after the impulses. A scramble signal also may be added after the impulses. In addition, a method for training the receiving MODEM is disclosed.

公开(公告)号：EP0204308A2

公开(公告)日：1986-12-10

申请号：EP86107506.7

申请日：1986-06-03

申请人： FUJITSU LIMITED

发明人： Kaku, Takashi ,  Arai, Yasuhiro

IPC分类号： H04L27/38 ,  H04L25/03 ,  H04L7/027

CPC分类号： H04L27/38 ,  H04L7/027 ,  H04L7/046 ,  H04L25/03133 ,  H04L2025/03783

摘要： A multipoint type MODEM communication system having a training device for adapting receiving parameters in a receiving MODEM (101) to a characteristic of a telephone line (300) connected to a sending MODEM in response to a training signal sent from the sending MODEM (201, 211, 222) prior to the reception of data. The training signal includes at least two impulses, a time between them defining the characteristic of the telephone line which should be adjusted in the receiving MODEM.
The training signal may be superimposed on a tone and a timing signal, which are used for gain control and pull-in synchronization, and the impulses used for equalization and carrier-phase-control. The training signal also may include the tone, the timing signal, and the impulses in series. Additional guard impulses may be added prior to and/or after the impulses. A scramble signal also may be added after the impulses.
In addition, a method for training the receiving MODEM is disclosed.

公开(公告)号：EP0069515B1

公开(公告)日：1986-10-01

申请号：EP82303328.7

申请日：1982-06-25

申请人： FUJITSU LIMITED

发明人： Unagami, Shigeyuki ,  Ihira, Kuninosuke ,  Kaku, Takashi

IPC分类号： H03G3/20

CPC分类号： H03G3/3089

公开(公告)号：EP0874493B1

公开(公告)日：2005-06-22

申请号：EP98201947.3

申请日：1993-07-09

申请人： FUJITSU LIMITED

发明人： Kaku, Takashi ,  Obikawa, Toyomi

IPC分类号： H04L1/22 ,  H04L5/14 ,  H04L25/06 ,  H04L25/03

CPC分类号： H04L25/0262 ,  H04B3/23 ,  H04L1/22 ,  H04L5/143 ,  H04L25/068

公开(公告)号：EP0721265A3

公开(公告)日：1996-11-27

申请号：EP96104775.0

申请日：1990-06-13

申请人： FUJITSU LIMITED

发明人： Mizutani, Yasunao ,  Kaku, Takashi

IPC分类号： H04L7/04 ,  H04L27/38

CPC分类号： H04L27/38 ,  H04L7/048

摘要： A modulator-demodulator device capable of detecting an unsynchronized frame state, comprising in the transmitter side: error control coding means (110) for coding the signal to be transmitted in accordance with a predetermined transition rule for restricting the transition of signal points on the complex plane; modulation means (140) for modulating the coded signal coded by said error control coding means to transmit the modulated signal to the communication network; first transmission signal selecting means (160) for transmitting a non-coded signal not coded by said error control coding means during a predetermined time period upon the start of transmission of the non-coded signal by said error control coding means; second transmission signal selecting means (160) for transmitting a predetermined coded signal coded by said error control coding means during a predetermined time period upon the completion of the transmission of the non-coded signal, and switching to the transmission of the transmission data upon the completion of the transmission of the coded signal;
   and said device comprising in the receiver side: demodulation means (200) for demodulating the signal point on the complex plane from the signal received from said communication network (6); error control signal decoding means (220) for setting an evaluation value for each of the transition sequences of a plurality of the received signals based on the transition rule of the transmitter side, updating the evaluation value for each of the received signals, and selecting the transition sequence of the maximum likelihood received signal based on the updated evaluation value to correct the error in the demodulated signal point; and evaluation value setting means (240) for designating to said error control signal decoding means the initial value of the evaluation value updated by the coding signal which is first received upon the switching from the transmission of the non-coded signal to the transmission of the coded signal.

摘要翻译： 一种调制解调器，包括误差控制编码器装置（16），其根据预定过程向发送侧的比特处理装置（10）向传输比特序列添加冗余并对其进行编码; 数据序列到坐标转换装置（18），其将来自所述误差控制编码器装置（16）的比特序列转换成复平面上的信号点坐标; 基于来自所述帧相位产生装置（12）的帧相位数据旋转所述转换的信号点坐标的坐标旋转装置（20）; 基于所述接收侧的帧相位产生装置的帧相位数据，使所述接收点坐标与所述发送侧的所述坐标旋转装置的相反坐标旋转的坐标旋转装置; 第二判断装置（38）利用由发送侧的差错控制编码装置（16）附加的冗余来判断接收点坐标中的最大似然信号点和校正误差; 以及判断装置（40），其基于所述第二判断装置（38）的判断点与复平面上的解调接收点之间的距离来判断是否存在帧外同步状态; 其中快速检测到帧外同步。 此外，在调制解调器中，为信号的转换序列设定评估值，基于接收侧的每个接收信号更新的评估值来选择最大似然的接收信号的转移序列，误差控制信号 被解码以在解调信号点校正错误，并且在数据传输中纠正错误。

公开(公告)号：EP0419225A2

公开(公告)日：1991-03-27

申请号：EP90310228.3

申请日：1990-09-19

申请人： FUJITSU LIMITED

发明人： Kaku, Takashi ,  Kishimoto, Hiroki

IPC分类号： H04L25/03

CPC分类号： H04L25/03044

摘要： A system of the transversal type automatic equalizer with a tap coefficient protection in which inter-symbol interference is prevented includes a summing unit (51) for summing all of the tap powers detected by a tap power detecting unit (41, 42, ... 4n), and a determination unit (52) for comparing the sum produced by the summing unit (51) with a predetermined threshold value, and for producing the output determination of normal when the sum is not more than the threshold value and producing the output determination of alnormal tap coefficient growth when the sum is more than the threshold value.

摘要翻译： 具有防止符号间干扰的抽头系数保护的横向型自动均衡器的系统包括：求和单元（51），用于将由抽头功率检测单元（41,42，...）检测到的所有抽头功能相加， 4n），以及确定单元（52），用于将求和单元（51）产生的和与预定阈值进行比较，并且用于当和不大于阈值时产生正常的输出确定并产生输出 当总和大于阈值时，确定抽头系数增长。

公开(公告)号：EP0173569B1

公开(公告)日：1991-02-27

申请号：EP85306127.3

申请日：1985-08-29

申请人： FUJITSU LIMITED

发明人： Kaku, Takashi ,  Endo, Chihiro

IPC分类号： H04L7/02

CPC分类号： H04L7/007 ,  H04L7/0029 ,  H04L7/027