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1. 发明专利

JPH0730684A COMMUNICATION EQUIPMENT 失效
公开(公告)号：JPH0730684A
公开(公告)日：1995-01-31
申请号：JP17559493
申请日：1993-07-15
申请人： MITSUBISHI ELECTRIC CORP
发明人： MURAKAMI MASAHIKO
IPC分类号： H04K1/02 , H04M3/56 , H04M11/00 , H04N7/14 , H04N7/16 , H04N21/442
摘要： PURPOSE:To compensate the transmission delay of a call control signal, to prevent the disturbance of video, and to prevent uncomfortable noises to hear. CONSTITUTION:The device is provided with a call control management circuit 25 to be connected with the opposite line, secret device 22 outputting the secret- processing video information signals to be transmitted and voice signals to the opposite terminal and resolving the secret of the video information signals and voice signals accepted from the opposite terminal, and a secret mode switching circuit 23 switching the secret mode through which the data pass the secret device 22 to raw mode through which data do not pass. Thus, the circuit 23 is controlled so that the operation of the secret device 22 is stopped in the lapse of the call control signal transmission delay time from the on-hook at the end of the communication.

2. 发明专利

JPH03291032A RECEIVER 失效
公开(公告)号：JPH03291032A
公开(公告)日：1991-12-20
申请号：JP9425290
申请日：1990-04-09
申请人： MITSUBISHI ELECTRIC CORP
发明人： MURAKAMI MASAHIKO
IPC分类号： H04J13/00 , H04B1/7156
摘要： PURPOSE:To detect and compare output levels of a filter bank, to detect the position of a hopping pattern and to reduce the synchronization acquisition time by providing the filter bank and a hopping pattern storage discrimination section to a high frequency amplifier stage. CONSTITUTION:A reception signal inputted to an antenna 10 enters a filter bank 12, the result is inputted to a level detector 3 via filters 1a-1n and high frequency amplifiers 2a-2n to detect an output level of the amplifiers 2a-2n at an optional time. A changeover device 4 selects a desired high frequency signal from the filter bank 12 with a switching signal from a control signal generator and gives the selected signal to a mixer 5. The mixer 5 receives an output of a local signal generator 8, an intermediate frequency amplifier 6 amplifies the said output when the high frequency signal switched by the changeover device 4 and the output of the generator 8 are in hopping with synchronization and a demodulator 7 detects and decodes the signal. A hopping pattern detector 11 detects the position of the hopping pattern and controls the generator 8 to generate an estimated hopping frequency thereby establishing synchronization.

3. 发明专利

JPH0344462B2 失效
公开(公告)号：JPH0344462B2
公开(公告)日：1991-07-08
申请号：JP7661283
申请日：1983-04-28
申请人： MITSUBISHI ELECTRIC CORP
发明人： MURAKAMI MASAHIKO , HIROO AKIRA
IPC分类号： H04B7/24 , H04B1/7156 , H04J13/00 , H04L12/403 , H04W4/04 , H04W74/06

4. 发明专利

JPH02150153A VOICE CONFERENCE SYSTEM 失效
公开(公告)号：JPH02150153A
公开(公告)日：1990-06-08
申请号：JP30214788
申请日：1988-12-01
申请人： MITSUBISHI ELECTRIC CORP
发明人： MURAKAMI MASAHIKO
IPC分类号： H04M3/56 , H04B14/04
摘要： PURPOSE:To make it unnecessary to repeatedly encoding and decoding a signal, and to decrease the deterioration of a tone quality by synchronizing a signal at a point with the signal from the other point at one point, and digitally adding and obtaining the necessary signal out of the synchronized signals. CONSTITUTION:Signals A1 to C1 from respective points A to C timing-regulated by timing regulating circuits 15 and 16 are mutually synchronized, and their phases correspond. Signals A1 and B1 except for a signal C1 at the point C of itself are digitally added by an adder 17, and supplied through a D/A converter 4 to a speaker 2. The signal A1 and B1, and A1 and C1 except for B1 or C1 at sending destinations are respectively digitally added by an adder 18, further encoded by a voice encoder 6, then sent to the respective points B and C. In such a way, since the signals necessary for the respective transmission destinations are added on the basis of the digital signal after the synchronization of the signals of the respective points at one point, decoding is smoothly executed at the respective points, and encoding and decoding and practically required only for once.

5. 发明专利

JPS6125341A Digital communication equipment 失效
标题翻译：数字通信设备
公开(公告)号：JPS6125341A
公开(公告)日：1986-02-04
申请号：JP14630384
申请日：1984-07-13
申请人： Mitsubishi Electric Corp
发明人： MURAKAMI MASAHIKO
IPC分类号： H04J13/00 , H04B1/715
CPC分类号： H04B1/715
摘要： PURPOSE:To eliminte intermission of sound by providing an interleave circuit and an error correction coder to a transmitter and providing an interleave circuit and an error correction decoder to a receiver so as to decrease disturbance due to frequency hopping. CONSTITUTION:The error correction coder 13 and an interleave circuit 12a are provided between an information - binary series converter 3 and a modulator 4 of a transmitter 1 of a digital communication equipment, the coder 13 and the circuit 12a rearrange the data and transmit the result to a channel 8 from a power amplifier 7. Further, an interleave circuit 12b and the error correction decoder 14 are provided between a demodulator 10 of the receiver 2 and a binary series - information converter 9 connected to an information user D, the circuit 12b and the decoder 14 rearrange the decoded data from the decoder 10 and the result is fed to the converter 9. Then the effect of disturbance in the frequency hopping system is reduced to avoid intermission of sound.
摘要翻译：目的：通过向发射机提供交错电路和纠错编码器，为接收机提供交错电路和纠错解码器，以减少由于跳频引起的干扰，从而消除声音间断。构成：纠错编码器13和交错电路12a设置在数字通信设备的信号二进制串行转换器3和发射机1的调制器4之间，编码器13和电路12a重新排列数据并发送结果另外，交织电路12b和纠错解码器14设置在接收机2的解调器10和连接到信息用户D的二进制串行信息转换器9之间，电路12b 并且解码器14将来自解码器10的解码数据重新排列，并且将结果馈送到转换器9.然后减少跳频系统中的干扰的影响，以避免间歇的声音。

6. 发明专利

JPS63126332A FREQUENCY HOPPING RECEIVER 失效
公开(公告)号：JPS63126332A
公开(公告)日：1988-05-30
申请号：JP27227486
申请日：1986-11-15
申请人： MITSUBISHI ELECTRIC CORP
发明人： KAWAKAMI TOSHIKAZU , MURAKAMI MASAHIKO
IPC分类号： H04J13/00 , H04B1/713
摘要： PURPOSE:To quicken the changeover of a frequency channel by providing plural high frequency amplifiers so as to deviate its changeover time. CONSTITUTION:A reception signal of an antenna 1 is fed to a mixer 3 through any of high frequency amplifiers 2a-2c and formed into an intermediate fre quency signal and fed to a signal processing unit 8 via an IF filter 5, an IFA 6 and a detector 7. A local oscillation signal to a mixer 3 is switched in a predetermined procedure based on the information on the processing unit 8 and the local oscillation signal corresponding to the reception frequency channel is fed to the mixer 3. The information on the processing unit 8 is sent to a control signal generator 9, where an optimum high frequency amplifier corre sponding to the selected channel is selected. The control signal in this case deviates the switching time.

7. 发明专利

JPS63279629A SYNCHRONIZING CIRCUIT 失效
公开(公告)号：JPS63279629A
公开(公告)日：1988-11-16
申请号：JP11514287
申请日：1987-05-12
申请人： KEISATSUCHIYOU CHOKAN , MITSUBISHI ELECTRIC CORP
发明人： FUKUMA KEIJI , MURAKAMI MASAHIKO
IPC分类号： H04B1/713 , H04B1/7156 , H04J13/00 , H04L7/00
摘要： PURPOSE:To attain sure synchronization acquisition by holding the synchronization for a prescribed time even when a reception level is fluctuated and stopping the operation of a timer during the synchronization acquisition so as to hold the synchronization stably even under fading. CONSTITUTION:A reception level is fluctuated due to fading or the like during the synchronization holding and the level notch time from a threshold level is a shorter time by the setting of a synchronization holding timer 6, the circuit is synchronized stably. On the other hand, a timer control circuit 7 is operated to stop the operation of the synchronization acquisition timer 6. Thus, even when the timer 6 is operated due to noise, the occurrence of mis-synchronization or excess of synchronization time is prevented.

8. 发明专利

JPS6223643A TRANSMISSION AND RECEPTION EQUIPMENT 失效
公开(公告)号：JPS6223643A
公开(公告)日：1987-01-31
申请号：JP16555585
申请日：1985-07-24
申请人： MITSUBISHI ELECTRIC CORP
发明人： MURAKAMI MASAHIKO
IPC分类号： H04K1/00 , H04B1/69 , H04B1/692 , H04L27/12 , H04L27/14
摘要： PURPOSE:To simplify constitution and to reduce the synchronizing time by using a spread code generating circuit for frequency hopping (FH) and direct spread (DS) and synchronize the phase of a FH pattern with that of a DS code in a transmission/reception device of the spread spectrum communication system. CONSTITUTION:The spread code generating circuit 8 is used for the FH and DS. In case of the transmission, the information input is coded and a spread modulation circuit 2 multiplies the code with a PN code (pseudo random number code) of the circuit 8. The direct spread signal is subject to radio modulation by a modulation circuit 3 and mixed with an output of a frequency synthesizer circuit 9 by a mixer 4. The output frequency of the circuit 9 is changed according to the series generated by the circuit 8. An FH pattern and the DS code are synchronized in phase at the transmission wave as shown in figure so that direct spread of one period (8-bit in figure) at one hop of the frequency is applied. Then the uncertainty of the phase of a high speed code series of the DS code is changed from 8-bit into 2-bit by the synchronization of the FH pattern.

9. 发明专利

JPS61208329A SYNCHRONOUS SPREAD SPECTRUM COMMUNICATION SYSTEM 失效
公开(公告)号：JPS61208329A
公开(公告)日：1986-09-16
申请号：JP5015685
申请日：1985-03-12
申请人： MITSUBISHI ELECTRIC CORP
发明人： MURAKAMI MASAHIKO
IPC分类号： H04B1/7073 , H04J13/00
摘要： PURPOSE:To improve the frequency utilizing efficiency by using a signal subjected to correction of antenna parting distance to a timing signal synchronously with a spread code as a system synchronization reference to join and separate to/from the system optionally. CONSTITUTION:The spread codes of fixed stations 1a, 1b are synchronized and the communication is started and the signal is used as the system synchronization standard. In this case, the distance between transmission and reception antenna separating distance between the fixed stations 1a and 1b is corrected by a timing adjusting device 6. Thus, a fixed station joining newly the system constituted in this way joins the system at any time by matching the spread code with the system reference. Since no master and no slave station exists in remaining stations, even if one station stops its function due to a fault or damage, the remaining stations have the system synchronization reference and the remaining performance of the system still exists. When the station joined once to the system is parted once from the system and desires re-join, when the system synchronization is kept by a highly stable clock 13, it is possible to join the system again without synchronization.

10. 发明专利

JPS6187441A Receiver of frequency hopping communciation system 失效
标题翻译：频率控制通信系统的接收者
公开(公告)号：JPS6187441A
公开(公告)日：1986-05-02
申请号：JP20866484
申请日：1984-10-04
申请人： Mitsubishi Electric Corp
发明人： MURAKAMI MASAHIKO
IPC分类号： H04J13/00 , H04B1/7156
CPC分类号： H04B1/715 , H04B1/7156 , H04B2001/7152
摘要： PURPOSE:To prevent mis-synchronization even when a large disturbing wave is received by comparing an automatic gain control voltage level of each amplifier at high and intermediate frequencies and controlling the operation of a synchronous controller in response to the compared output. CONSTITUTION:An input signal from an antenna is amplified by an automatic gain control high-frequency amplifier 2 and inputted to a mixer 4. A local oscillator 3 generates a hopping output and inputs it to a mixer 4 at a frequency apart by an intermediate frequency from the antenna input signal by using a digital output from a hopping pattern generator 5. The generator 5 is actuated by an output of a lead phase clock generator 6 when the operating clock is not synchronized and actuated with a subsequent clock generator 7 when synchronized. An output of the mixer 4 is inputted to an intermediate frequency amplifier 9 through a BPF8. When a strong disturbing wave is inputted to an antenna, the input to the amplifier 2 is large and the input to the amplifier 9 is small, then the AGC voltage of both the amplifiers is compared (12), the comparison output holds the state of a synchronizing discriminator to prevent mis-synchronism by the disturbing wave.
摘要翻译：目的：通过比较高频和中频各放大器的自动增益控制电压电平，并通过比较输出来控制同步控制器的运行，即使接收到大的干扰波也可防止误动作。构成：来自天线的输入信号由自动增益控制高频放大器2放大并输入到混频器4.本地振荡器3产生跳频输出，并将其输入混频器4，频率以中频分频通过使用来自跳频图案发生器5的数字输出，从天线输入信号。当同步时，当工作时钟不同步并且与随后的时钟发生器7一起致动时，发生器5由引导相位时钟发生器6的输出驱动。混频器4的输出通过BPF8输入到中频放大器9。当向天线输入强扰动波时，放大器2的输入量大，放大器9的输入量小，则两个放大器的AGC电压进行比较（12），比较输出保持一个同步鉴频器，用于防止干扰波的错位同步。

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