公开(公告)号：JPS6485433A

公开(公告)日：1989-03-30

申请号：JP24083387

申请日：1987-09-28

Applicant: TOSHIBA CORP

Inventor： HIROSE TSUGIHIRO

IPC: H04B7/15

Abstract: PURPOSE:To improve the utilizing efficiency of a channel by controlling the degree of appearance of transmission interval between transmission timing signals in response to the length of same information signal even when plural terminal stations are going to send an information signal of nearly the same length in the same time zone. CONSTITUTION:A central station 21 is provided with a means 12 sending plural transmission timing signals at plural different transmission intervals, and means 14, 15 monitoring the traffic of a burst signal sent by plural terminal stations 22 respectively. Each of plural terminal stations 22 is provided with a means 33 discriminating plural different transmission intervals of the received transmission timing signal and a means 36 sending the information signal in response to the transmission interval of the sent timing signal as a burst signal based on the result of discrimination. The central station 21 controls the rate of appearance of the different transmission interval between plural transmission timing signals from the traffic of the burst signal. Thus, in sending the packet of various length, the channel utilizing efficiency is improved without requiring a complicated equipment.

公开(公告)号：JPS61234143A

公开(公告)日：1986-10-18

申请号：JP7475485

申请日：1985-04-09

Applicant: TOSHIBA CORP

Inventor： KOBAYASHI HIROSHI ,  HIROSE TSUGIHIRO ,  HARUYAMA HIDEO

IPC: H04L27/148 ,  H04L27/14

Abstract: PURPOSE:To highly stabilize a receiving circuit and at the same time, to reduce the cost of the circuit by constituting the 1st and 2nd band-pass filters of electromechanical filters and equivalently constituting the 3rd band-pass filter by using an adder which takes the sum of the transmitting outputs of the 1st and 2nd filters. CONSTITUTION:A transmitted RF signal (FSK-modulated wave) is frequency-converted into an IF signal through an amplifier 21, band-pass filter 22 of an LC, amplifier 23 which is also used for adjusting receiving gain and mixer 24 and inputted in an SAW filter 26. The SAW filter 26 is composed of the 1st band-pass filter 26a which passes frequency components near a frequency f1 only and the 2nd band-pass filter 26b which passes frequency components near another frequency f2. The filters 26a and 26b are formed on the same base plate in such a way that their phase characteristics and group delay frequency characteristics can be made constant, and their transmitting outputs are compared with each other by means of a comparator 31 after respectively passing through amplifiers 27 and 28 and envelope detecting circuits 29 and 30, and thus, a demodulated out RXD is obtained. On the other hand, this receiving circuit simultaneously performs collision and its transmitting output is led to an adder 32.

公开(公告)号：JPS59115645A

公开(公告)日：1984-07-04

申请号：JP22521582

申请日：1982-12-22

Applicant: Toshiba Corp

Inventor： KOBAYASHI HIROSHI ,  HARUYAMA HIDEO ,  HIROSE TSUGIHIRO

IPC: H04B3/10 ,  H04L12/28 ,  H04L27/10

CPC classification number: H04B3/10 ,  H04L12/2801 ,  H04L27/10

Abstract: PURPOSE: To attain the detection of collision on a carrier band transmission line at each MODEM by deciding a modulation parameter so that the period of a beat signal of a carrier band signal transmitted from plural MODEMs is the same degree as the bit time intervals of a base band signal or below.
CONSTITUTION: A transmission data comprising the base band signal given from a high-order protocol device via an interface line or a signal coding the said signal is inputted to an FM modulator 11 of an MODEM6, where the signal is frequency-modulated and the result is transmitted to a transmission line 12 via a band pass filter 12 and a transmission amplifier 13. That is, the transmission data is modulated into a carrier band signal having a frequency shift and transmitted to a transmission line 1. Further, a level detector 17 detects the level of the received carrier band signal and the level specific to the beat signal produced by collision, and is energized by the detection of collision and generates a collision detection signal comprising a pulse in 10MHz. This collision detecting signal is given to the high-order protocol device and the generation of collision on the transmission line 1 is informed.
COPYRIGHT: (C)1984,JPO&Japio

Abstract translation: 目的：通过确定调制参数，使得从多个调制解调器发送的载波信号的拍频信号的周期与一个调制参数的比特时间间隔相同程度地达到在每个MODEM的载波频带传输线上的冲突检测 基带信号或以下。 构成：包括经由接口线从高阶协议装置给出的基带信号或编码所述信号的信号的传输数据被输入到MODEM6的FM调制器11，其中信号被调频，并且结果 经由带通滤波器12和发送放大器13发送到传输线路12.也就是说，将发送数据调制成具有频移的载波频带信号并发送到传输线路1.此外，电平检测器17 检测接收到的载波信号的电平和由碰撞产生的拍频信号特有的电平，并通过碰撞检测来激励，并产生包括10MHz脉冲的冲突检测信号。 该冲突检测信号被提供给高阶协议装置，并且通知传输线1上的冲突的产生。

公开(公告)号：JPS63228839A

公开(公告)日：1988-09-22

申请号：JP6327087

申请日：1987-03-18

Applicant: TOSHIBA CORP

Inventor： HIROSE TSUGIHIRO ,  NAKAMURA MAKOTO

IPC: H04L1/20

Abstract: PURPOSE:To always monitor the quality of a circuit with no insertion of a specific signal for check of the circuit quality by performing the soft decision (multi-value decision) of the output of a demodulator to obtain reliability degree data on each information bit and to carry out statistic processing by an amount equal to an information bit string of prescribed length and deciding the circuit quality. CONSTITUTION:A soft deciding circuit 1 gives the soft decision (multi-value decision) to an analog output signal of a demodulator and outputs soft decision data. A bit reliability degree calculation circuit 3 converts the soft decision data into the reliability degree data to show the reliability degree of each information bit. A bit string reliability degree calculation circuit 4 performs the statistic processing of said reliability degree by an amount equal to the number of bits of the prescribed length and converts in into the reliability degree data of an information bit string of the prescribed length. A circuit quality deciding circuit 5 refers to said reliability degree data on the information bit string to decide whether the circuit quality higher or lower than a prescribed level and outputs the result of this decision. Thus it is not required to insert a specific signal for check of the circuit quality into the transmission data. Therefore, the circuit quality is monitored with no deterioration in transmission efficiency.

公开(公告)号：JPS61234152A

公开(公告)日：1986-10-18

申请号：JP7475385

申请日：1985-04-09

Applicant: TOSHIBA CORP

Inventor： KOBAYASHI HIROSHI ,  HARUYAMA HIDEO ,  HIROSE TSUGIHIRO

IPC: H04L27/12 ,  H04L27/148

Abstract: PURPOSE:To obtain a frequency shift keying (FSK) modulator which is highly stable, has a narrow band, and does not required any adjustment and, at the same time, to prevent the complication of the constitution, by obtaining an FSK-modulated wave by switching two kinds of carriers, between both of which a prescribed frequency difference is secured and both of which are phase- synchronized to a data signal to be modulated, in accordance with the value of the data signal to be modulated. CONSTITUTION:A frequency divider 11 divides a clock signal CLK into four parts and produces the 1st carrier Cm1 of 6MHz and another frequency divider 12 divides the clock signal CLK into six parts and produces the 2nd carrier Cm2 of 4MHz. The 3rd frequency divider 13 divides the clock signal CLK into 12 parts and produces a data clock TXCLK of 2MHz. The 1st and 2nd carriers Cm1 and Cm2 are switched to each other by means of a switching means composed of a D-type flip flop 14, AND gates 15 and 16, and OR gate 17 in accordance with the value of a data signal TDX to be modulated. Then the OR of the two carriers Cm1 and Cm2 is taken by the OR gate 17. Therefore, a digit-like FSK-modulated wave TF whose phase is continuous before and after frequency shifting is outputted from the OR gate 17.

公开(公告)号：JPS59178840A

公开(公告)日：1984-10-11

申请号：JP5272183

申请日：1983-03-30

Applicant: Toshiba Corp

Inventor： KOBAYASHI HIROSHI ,  HARUYAMA HIDEO ,  HIROSE TSUGIHIRO

IPC: H04L25/03 ,  H04L1/24

CPC classification number: H04L1/24

Abstract: PURPOSE:To minimize an error rate or the probability of misidentification of an occurred event by providing a threshold value identifying the level calculated based on the distribution of a value of physical quantity observed at the receiving side in data transmission. CONSTITUTION:In transmitting a binary data taking a voltage level as a medium, a voltage observed by a voltage-alphabet converter 9 has a probability distribution corresponding to each input alphabet based on distortion and output error of an alphabet-voltage transducer 6 and noise and distortion on a transmission line 7, and when it is known that the adjacent binary values follows to the normal distribution consisting respectivey of average value L'1 and variance sigma1 and average value L'2 and variance sigma2 , a threshold value generator 10 outputs a threshold value giving the minimum error rate (sigma2L'1+sigma1L'2)/(sigma1+sigma2) to the binary value.

Abstract translation: 目的：通过提供基于数据传输中在接收侧观察到的物理量值的分布来确定计算出的电平的阈值来最小化发生事件的错误率或错误识别的概率。 构成：在传送采用电压电平作为介质的二进制数据的情况下，由电压 - 字母转换器9观察到的电压具有基于字母电压换能器6的失真和输出误差对应于每个输入字母表的概率分布，噪声和 传输线7上的失真，并且当已知相邻的二进制值遵循由平均值L'1和方差σ12以及平均值L'2和方差σ22组成的正态分布时，a 阈值发生器10将给出最小误差率（sigma2L'1 + sigma1L'2）/（sigma1 + sigma2）的阈值输出到二进制值。

公开(公告)号：JPS6342244A

公开(公告)日：1988-02-23

申请号：JP18520986

申请日：1986-08-08

Applicant: TOSHIBA CORP

Inventor： HIROSE TSUGIHIRO

IPC: H04B7/24 ,  H04B7/26 ,  H04L1/16 ,  H04L13/00 ,  H04L29/08

Abstract: PURPOSE:To decrease the capacity of a reverse direction transmission line, and to remarkably contrive the improvement of the utilization efficiency of a communication channel, by sharing a slot for sending out a retransmission request signal, by plural receiving stations. CONSTITUTION:Retransmission request signals corresponding to data bursts 1, 2,..., (n) on a forward transmission line are synchronized by the synchronization control circuit 35 of a receiving station 22 so as to be sent out to slots 1, 2,..., (n). Therefore, in a transmitting station, by only detecting the existence of the retransmission request signal, for instance, in the slot 1, it is known that said existence is requesting the retransmission of the data burst 1. Also, even if retransmission request signals are sent out almost simultaneously from plural receiving stations 22, and a collision occurs, it can be known that the retransmission is requested from at least one or more stations. In accordance with this retransmission request, the transmitting station executes the retransmission to a receiving station.

公开(公告)号：JPS62296055A

公开(公告)日：1987-12-23

申请号：JP13378687

申请日：1987-05-29

Applicant: TOSHIBA CORP

Inventor： KOBAYASHI HIROSHI ,  HIROSE TSUGIHIRO ,  HARUYAMA HIDEO ,  KANO JIRO ,  KOJIMA YOSHIO ,  KODACHI ATSUNARI

IPC: E04F15/024 ,  E04F15/18

公开(公告)号：JPS61145995A

公开(公告)日：1986-07-03

申请号：JP26882484

申请日：1984-12-20

Applicant: TOSHIBA CORP

Inventor： KOBAYASHI HIROSHI ,  HIROSE TSUGIHIRO ,  HARUYAMA HIDEO

IPC: H04Q3/62 ,  G06F13/372 ,  H04J3/06 ,  H04L12/28 ,  H04Q3/60 ,  H04Q3/64 ,  H04Q11/04

Abstract: PURPOSE:To make it possible to set up a resonable timing of signal transmission without a load for a central processor by controlling adequately a signal transmission timing which is obtained from a test signal of each line concentration/ distribution terminal and a transmission delay time measured by a return time of the test signal. CONSTITUTION:The central processor 1 transmits datum DO1, DO2-DOn inserting dummy datum with time-sharing to each line concentration/distribution terminal 2a, 2b-2n using a transmission line 4. The central processor receives the transmitted datum DI1, DI2-DIn which are sent out from line concentration/ disbrituion terminals 2a, 2b thru 2n with fixed timing at a transmission path 3 on a time-sharing. A signal a contains an addressing signal which indicates a line concentration/distribution terminal and a window frame to measure a delay time. The test signal from the line concentration/distribution terminal indicated by an addressing signal is transmitted in this window time period.

公开(公告)号：JPS59115633A

公开(公告)日：1984-07-04

申请号：JP22521682

申请日：1982-12-22

Applicant: Toshiba Corp

Inventor： KOBAYASHI HIROSHI ,  HIROSE TSUGIHIRO ,  HARUYAMA HIDEO

IPC: H04B3/04 ,  H04B3/10 ,  H04L12/28 ,  H04L27/10

CPC classification number: H04L12/2801 ,  H04B3/10 ,  H04L27/10

Abstract: PURPOSE: To improve the quality of transmission and to attain sure detection of collision by detecting a reference signal level of each interface device and adjusting gains of receiving and transmission amplifiers according to the result of detection to make a receiving signal level constant.
CONSTITUTION: A reference level signal generator 6 generates a reference signal of a prescribed level at the application of power to each MODEM5 or at each time interval decided depending on the traffic on transmission line and transmits the signal onto a receiving transmission line 2 via a head end 3. The gain of the receiving and transmission amplifiers of each MODEM5 is adjusted by detecting the level of the reference signal transmitted in this way. Further, the information of a receiving signal level detected by a level detector 17 is given to a collision discriminator 19, which detects collision by utilizing the principle that the signal level is increased when signals are collided with each other on the transmission line. Its collision detecting signal is supplied to an information processor 4. Then, the information transmission by the CSMA/CD system is controlled.
COPYRIGHT: (C)1984,JPO&Japio

Abstract translation: 目的：提高传输质​​量，通过检测每个接口设备的参考信号电平，确保检测到碰撞，根据检测结果调整接收和发送放大器的增益，使接收信号电平保持不变。 构成：参考电平信号发生器6在对每个MODEM5施加电力时产生规定电平的参考信号，或者根据传输线上的业务量确定的每个时间间隔产生一个规定电平的参考信号，并通过磁头将信号发送到接收传输线2 通过检测以这种方式发送的参考信号的电平来调整每个MODEM5的接收和发送放大器的增益。 此外，由电平检测器17检测到的接收信号电平的信息被提供给冲突判别器19，该检测器通过利用当信号在传输线路上相互碰撞时信号电平增加的原理来检测冲突。 其冲突检测信号被提供给信息处理器4.然后，控制由CSMA / CD系统发送的信息。