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71. 发明专利

JPS61114610A Dc amplifier with automatic gain control 失效
标题翻译：直流放大器具有自动增益控制
公开(公告)号：JPS61114610A
公开(公告)日：1986-06-02
申请号：JP23546284
申请日：1984-11-08
申请人： Mitsubishi Electric Corp
发明人： NANBARA TOMOHIKO , KITAYAMA TADAYOSHI , NAKAMURA ICHIRO , SEGAMI KOICHI , MOTOJIMA KUNIAKI
IPC分类号： H04B1/16 , H03G3/20 , H03G3/30
摘要： PURPOSE: To simplify a circuit and to improve control accuracy by providing a DC offset voltage detection circuit so as to make control of the gain and DC offset possible by detecting only a positive peak value of an output signal in case detecting the peak value of an output signal.
CONSTITUTION: A DC offset voltage detection circuit 17 is provided. The circuit 17 extracts a DC offset voltage from an output signal voltage of a main amplifier circuit 5. A level shift circuit 18 boosts the DC level by a half of the specified amplitude of the circuit 5 to obtain a potential 22. The potential 22 is made always constant even when the DC bias of the output is fluctuated. Since the LOW level of a negative signal of the circuit 5 is detected by a positive peak detection circuit 7a and its output voltage is a value lower by the base- emitter voltage of a transistor from the actual peak voltage. Thus, the output of the detection circuit 7a is controlled to be equal to the output voltage 23 to realize the stable state.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：为了简化电路并通过提供直流偏移电压检测电路来提高控制精度，以便在检测到峰值的情况下检测输出信号的正峰值可以实现增益和直流偏移的控制输出信号。构成：提供DC偏移电压检测电路17。电路17从主放大器电路5的输出信号电压提取DC偏移电压。电平移位电路18将DC电平升高电路5的规定幅度的一半以获得电位22.电位22为即使输出的直流偏压波动，也始终保持恒定。由于电路5的负信号的低电平由正峰值检测电路7a检测，并且其输出电压是由实际峰值电压由晶体管的基极 - 发射极电压降低的值。因此，检测电路7a的输出被控制为等于输出电压23，以实现稳定状态。

72. 发明专利

JPS58170149A SIGNAL MONITORING SYSTEM 失效
公开(公告)号：JPS58170149A
公开(公告)日：1983-10-06
申请号：JP5183882
申请日：1982-03-30
申请人： MITSUBISHI ELECTRIC CORP
发明人： KITAYAMA TADAYOSHI , OOSHIMA KAZUYOSHI , SUGANO NORIO , ITOU KATSUYOSHI
IPC分类号： H04B10/079 , H04B10/27 , H04L12/44
摘要： PURPOSE:To realize a system capable of detecting simply a collision of signals, by deciding a collision of signals if a receiving signal is detected within a period from the starting time of transmission at own station through the delay time of transmission for the signal of own station. CONSTITUTION:When the optical signal of another station is received before the reception of the optical signal of own station, an output signal 15c of a waveform shaping circuit 9 is fed to an integration circuit 12. Then the circuit 12 delivers an output signal 18b of integration circuit in response to the input of the signal 15c. The signal 18b exceeds the threshold value 17 of decision at a time point 24, and a comparator 13 delivers a significant signal to an AND circuit 21b. The circuit 21b secures an AND of outputs of a transition detecting circuit 20b and the comparator 13 and then delivers a collision detecting significant signal 25. When no collision of signals occurs, a receiving signal 15a delivered from the circuit 9 is supplied to the circuit 12. Then the circuit 12 delivers an output signal 18c of integration circuit.

73. 发明专利

JPS58170139A DETECTING SYSTEM OF SIGNAL COLLISION 失效
公开(公告)号：JPS58170139A
公开(公告)日：1983-10-06
申请号：JP5183682
申请日：1982-03-30
申请人： MITSUBISHI ELECTRIC CORP
发明人： OOSHIMA KAZUYOSHI , KITAYAMA TADAYOSHI , SUGANO NORIO , ITOU KATSUYOSHI
IPC分类号： H04B10/27 , H04B10/079 , H04L12/413 , H04L12/44
摘要： PURPOSE:To obtain a signal collision detector having high reliability and a low cost for an optical fiber network, by monitoring the level of received optical signal and detecting the collision of signals by detecting the change of levels of the received optical signal in case a collision of signals occurs on a transmission line. CONSTITUTION:When a collision occurs on a transmission line between the light transmitted from own station and the light transmitted from another station, an output signal waveform 35 given from an amplifier 8 has a large amplitude at and after the generation of the collision. An integration value output 36 delivered from an integration circuit 29 exceeds an output signal 33 given from an integration circuit 28 at a time point 37. Then a significant signal is delivered to a colision signal line 16 from a deciding circuit 30. The output of the circuit 29 is set at the value smaller than the sum of the output of the circuit 29 with respect to the signal of own station and the output of the circuit 29 with respect to the signal of another station. As a result, it is possible to detect a collision against the signal of any station that occurs under transmission of own station.

74. 发明专利

JPS5869151A DECODING CIRCUIT 失效
公开(公告)号：JPS5869151A
公开(公告)日：1983-04-25
申请号：JP16815281
申请日：1981-10-21
申请人： MITSUBISHI ELECTRIC CORP
发明人： KITAYAMA TADAYOSHI , KAWARABAYASHI SHIGEYUKI
IPC分类号： H03M5/12 , H04L7/00 , H04L7/08 , H04L25/49
摘要： PURPOSE:To decode a biphase code surely and to simplify a decoding circuit, by correctly detecting the bit pattern of a synchronizing word, and selecting the pulse train as a sampling pulse. CONSTITUTION:A signal (a) is applied to a signal input terminal D of the 1st and 2nd FFs 4, 5, and pulses (b) and (c) a half a pulse (p) picked up at the repetitive period of T/2 from the signal (a) are respectively added to a clock terminal C of the FFs 4, 5. Outputs (d) and (e) of the FFs 4, 5 are respectively applied to the 1st and 2nd synchronizing word detecting circuits 6, 7 and AND gates 10, 11. Outputs of the pulses (b) and (c) from a 1/2 frequency divider 1 are applied to the circuits 6, 7 respectively, a correct bit pattern is outputted from the circuits 6, 7 to set the 1st and 2nd monostable FFs 8, 9. Outputs (h) and (i) of the FFs 6, 7 are applied to the gates 10, 11, the logic of the outputs of the gates 10, 11 is taken at an OR gate 12 to surely decode a biphase code and to output an output (j).

75. 发明专利

JPS5866437A CODE TRANSMITTER 失效
公开(公告)号：JPS5866437A
公开(公告)日：1983-04-20
申请号：JP16530381
申请日：1981-10-16
申请人： MITSUBISHI ELECTRIC CORP
发明人： KITAYAMA TADAYOSHI , SUGIYAMA YASUO
IPC分类号： H04B10/556 , H03M5/04 , H04B10/00 , H04B10/524 , H04L25/06 , H04L25/38 , H04L25/49
摘要： PURPOSE:To suppress a sag within a allowable range and at the same time to decrease the drift time, by selecting practically the low band cut-off frequency at sag and and at f0 (f0=1/T, T: bit frequency) to 1.4X10 f0. A specific value is selected out of the above-mentioned range from the requirement to both N and D for a phase code. The same procedure is available also to an FM code.

76. 发明专利

JPS5864849A CODE TRANSMITTER 失效
公开(公告)号：JPS5864849A
公开(公告)日：1983-04-18
申请号：JP16388081
申请日：1981-10-14
申请人： MITSUBISHI ELECTRIC CORP
发明人： KITAYAMA TADAYOSHI
IPC分类号： H03M5/12 , H04L7/00 , H04L7/02 , H04L25/49
摘要： PURPOSE:To avoid code errors even on a transmission line deteriorated in low frequency characteristics, by providing a decoding circuit which uses the code bit of the latter half the period, among signals generated through a bi-phase encoding circuit. CONSTITUTION:An NRZ code added with a synchronizing code, and having A logic at one-bit period T is inputted to a bi-phase encoding circuit 1, the circuit 1 outputs an NRZ code of two bit having A-A or -AA logic at period T/2 and and inputs the coce to a demodulator 4 via a modulator 2 and a transmission line 3. A 1/2-frequency divider 5 generates a pulse (c) in the period T and a pulse (d), phase difference of T/2 with the pulse (c) and they are respectively inputted to the clock terminal of FFs 9, 10. The output of the demodulator 4 is inputted to a terminal D of the FFs 9, 10 via an inverte 8. The output of the FFs 9, 10 is inputted to synchronizing word detecting circuits 11, 12 and a switching gate 18, respectively. The circuits 11, 12 transmits the output to FFs 13, 14 when the synchronizing word and the bit pattern are coincident, and the output of the FFs 13, 14 is inputted to the switching gate 18 to output a signal (k).

77. 发明专利

JPS5812449A OPTICAL FIBER MULTIPLE ACCESS COMMUNICATION DEVICE 失效
公开(公告)号：JPS5812449A
公开(公告)日：1983-01-24
申请号：JP11116781
申请日：1981-07-14
申请人： MITSUBISHI ELECTRIC CORP
发明人： MATSUMOTO MASAHIRO , OOSHIMA KAZUYOSHI , KITAYAMA TADAYOSHI , MATSUI TERUHITO , ITOU KATSUYOSHI
IPC分类号： H04B10/27 , H04B10/00 , H04B10/03 , H04B10/038 , H04B10/079 , H04B10/275 , H04B10/524 , H04L12/42
摘要： PURPOSE:To make the level of an optical signal, which arrives at an optical receiver, constant, by permitting data stations, which use a looped trunk line optical fiber as a common transmission line, to communicate with one another through an optical repeating device. CONSTITUTION:Optical signals with wavelength lambda1 transmitted from data stations 13-17 are coupled with a trunk line optical fiber 1 by T-shaped optical couplers 12a-12e, and transmitted in both the ways of the optical fiber. The optical signals propagating through the fiber 1 are received by an optical repeating device 18 theough the T-shaped optical couplers 12a-12e. The received optical signals are repeated and amplified by the device 18 to be converted into light signals with wavelength lambda2, which are sent out. Those optical signals are distributed to the stations 13-17 through the coupler 11, fiber 1, and couplers 12a- 12e respectively. If the breaking of the fiber 1 occurs, a trunk line controller 9 detects that and operates its optical switch from an open-circuit state to a closed-circuit state, so that both ends of the fiber are connected by the optical transmission line of the optical switch.

78. 发明专利

JPS57196639A LEVEL MONITORING CIRCUIT FOR PHOTORECEIVER 失效
公开(公告)号：JPS57196639A
公开(公告)日：1982-12-02
申请号：JP8325981
申请日：1981-05-28
申请人： MITSUBISHI ELECTRIC CORP
发明人： KITAYAMA TADAYOSHI
IPC分类号： H04B10/00 , H04B10/07 , H04B10/67 , H04B10/69
摘要： PURPOSE:To detect an optical reception level, by providing a logarithmic amplifier outputting a voltage proportional to a logarithm which is a difference between the breakdown voltage of an avalanche photodiode (APD) and a bias voltage. CONSTITUTION:An optical signal is photoelectrically converted and multiplied for electrons at an APD1 and a voltage drop is produced across a resistor 2. This voltage drop is amplified at an amplifier 3 for output and the peak value of the output is detected at a peak detection circuit. A differential amplifier 9 amplifies a difference between the peak voltage and a reference voltage and a voltage amplified at a DC amplifier 10 is a bias voltage of the APD1. The difference between this bias voltge and the breakdown voltage is amplified at a differential amplifier 12 and converted into a logarithm at a logarithmic amplifier 14. When the difference between the output of the amplifier 14 and a prescribed reference voltage is amplified at an amplifier 16, the logarithmic value of the peak of the optical signal can be obtained.

79. 发明专利

JPS56112130A OPTICAL DATA WAY EQUIPMENT 失效
公开(公告)号：JPS56112130A
公开(公告)日：1981-09-04
申请号：JP1521880
申请日：1980-02-08
申请人： MITSUBISHI ELECTRIC CORP
发明人： KITAYAMA TADAYOSHI , SUGIYAMA YASUO , MATSUMOTO MASAHIRO , MINO YASUSHIROU
IPC分类号： H04B10/00 , H04B10/27 , H04B10/275 , H04J3/08 , H04L12/42
摘要： PURPOSE:To couple the optical station by means of an optical data way, by measuring the optical branch device having a function for coupling an output signal from the optical station to the optical fiber, and arranging it at the position which is to be controlled. CONSTITUTION:An optical signal reaches the optical station 1 through the optical fiber 1n, the optical branch path 21a of the optical branch device 21, and the branch optical fiber 1a. The output of the optical station 1 reaches the optical station 2 through the branch optical fiber 1b, the optical coupling path 21b of the optical branch device 21, the optical fiber 11, the optical branch path 22a of the optical branch device 22, and the optical fiber 2a. The output of the optical station 2 reaches the next optical station connected to the optical branch device through the branch optical fiber 2b, the optical coupling path 22b of the optical branch device 22, the optical fiber 12, the optical by-pass path 23c of the optical branch device 23, and the optical fiber 13. In case of the branch device to which the optical station is not connected, the control signal is turned off.

80. 发明专利

JPS55115383A BIAS CIRCUIT FOR LASER DIODE 失效
公开(公告)号：JPS55115383A
公开(公告)日：1980-09-05
申请号：JP2275479
申请日：1979-02-27
申请人： MITSUBISHI ELECTRIC CORP
发明人： KITAYAMA TADAYOSHI , NAGANO MUNEHIKO
IPC分类号： H01S5/068
摘要： PURPOSE:To stabilize a light output despite the change in the threshold current of a laser diode due to temperature change, by utilizing the voltage across the base and emitter of a transistor or the temperature characteristics of said voltage and the terminal voltage of the diode. CONSTITUTION:A laser diode 1 is connected to the collector of a transistor 5 through a modulation signal input terminal 8. A resistor 9 whose resistance is set for temperature compensation is coupled to the emitter of the transistor. Bias resistors 10, 11 for the transistor 5 are coupled in parallel with the connected circuit including the transistor and the diode 1. The connection node of the resistors 10, 11 is connected to the base of the transistor 5. A DC power source 7 is coupled in parallel with the circuit including the transistor 5. Since the light output of the diode is stabilized by the temperature characteristic of the transistor circuit against the ambient temperature, the bias circuit is rendered simple and cheap.

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