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1. 发明专利

JPH031729A BROAD-BAND COMMUNICATION EQUIPMENT 失效
公开(公告)号：JPH031729A
公开(公告)日：1991-01-08
申请号：JP13633689
申请日：1989-05-30
申请人： JAPAN TECH RES & DEV INST , MITSUBISHI ELECTRIC CORP
发明人： MUTO YOSHITAKA , SAWASA HIROYUKI , MURAKAMI MASAHIKO
IPC分类号： H04J13/00 , H04B1/713 , H04B7/005
摘要： PURPOSE:To obtain a broad-band frequency communication equipment with less characteristic degradation without complicating the equipment by flattening the frequency characteristic of the entire equipment including a radio wave propagation path. CONSTITUTION:A transmission output of a transmitter 1 radiates from a transmission antenna 2 and a broad band frequency hopping signal reaching a reception antenna 4 through the propagation path 3 is inputted to a receiver 5. The frequency characteristic of the transmission reception antennas 2, 4 and the frequency characteristic of the reception 5 are selected to have less passing loss at a high frequency and to have a relative gain, then the frequency characteristic of the transmitter 1 is adjusted to make the entire frequency characteristic flat. Thus, since the frequency characteristic of the transmission/reception antennas, the transmitter and the reception is made flat while including that of the propagation path, the broad-band communication equipment with less characteristic degradation is obtained without complicating the equipment.

2. 发明专利

JPH03167929A TRANSMITTER 失效
公开(公告)号：JPH03167929A
公开(公告)日：1991-07-19
申请号：JP30661789
申请日：1989-11-28
申请人： JAPAN TECH RES & DEV INST
发明人： MUTO YOSHITAKA , SAWASA HIROYUKI , MURAKAMI MASAHIKO
IPC分类号： H04L27/10 , H04B1/7136 , H04J13/00
摘要： PURPOSE:To attain hopping with small sized transmitter over a wide range without making the transmitter complicated by using a changeover device to switch plural band pass filters in response to the frequency hopping or varying the tuning frequency of the tuning type band pass filter. CONSTITUTION:A modulation output signal from a modulator 1 is fed to a mixer 3. Another input to the mixer 3 is an output of a frequency synthesizer 2 and the output is a frequency hopping signal controlled by a digital output of a hopping pattern generator 4. Let the output at a time of the frequency synthesizer 2 be fL, the output of the mixer 3 is caused at upper side (fL+fm) and at lower side (fL-fm). A band pass filter 5 passes the lower frequencies of the output of the mixer 3 and a band pass filter 6 passes upper frequencies. A changeover device 7 selects any of the band pass filters 5, 6 in response to the hopping by the control of the hopping pattern generator 4. That is, two of (fL+fm) and (fL-fm) are selected as the transmission output with respect to one output fL of the frequency synthesizer 2.

3. 发明专利

JPH02309833A COMMUNICATION EQUIPMENT 失效
公开(公告)号：JPH02309833A
公开(公告)日：1990-12-25
申请号：JP13014989
申请日：1989-05-25
申请人： JAPAN TECH RES & DEV INST
发明人： MUTO YOSHITAKA , SAWASA HIROYUKI , MURAKAMI MASAHIKO
IPC分类号： H04K1/04 , H04B1/7156 , H04J13/00
摘要： PURPOSE:To simplify the synchronizing circuit and to reduce the synchronization acquisition time by providing a low speed clock generator and a high speed clock generator to switch the hopping speed. CONSTITUTION:A low speed clock generator 6 and a high speed clock generator 7 are provided and they are used switchingly. That is, an input to a reception antenna 1 is amplified by a high frequency amplifier 2 and fed to a mixer 4. Another input to the mixer 4 is an output of a local oscillator 3 and the output is hopped at a frequency parted by a difference of an intermediate frequency apart from an input of the reception antenna 1 with a digital output of a hopping pattern generator 5. Then the low speed clock generator 6 and a switch 15 are provided and the low speed clock generator 6 controls the hopping pattern generator 5 till the synchronization acquisition is established. Thus, the synchronizing circuit is simplified and the synchronization acquisition time is reduced.

4. 发明专利

JPH0222940A FREQUENCY SYNTHESIZING DEVICE 失效
公开(公告)号：JPH0222940A
公开(公告)日：1990-01-25
申请号：JP17183688
申请日：1988-07-12
申请人： JAPAN TECH RES & DEV INST
发明人： MUTO YOSHITAKA , SAWASA HIROYUKI , IGUCHI YOSHIO , MURAKAMI MASAHIKO
IPC分类号： H04K1/00 , H04B1/7136 , H04B1/7143 , H04J13/00
摘要： PURPOSE:To reduce an unstable section in the switching of a frequency and to improve transmission efficiency by providing two tuning type band-pass filters at an output stage, and switching and using them selectively by a switching control signal. CONSTITUTION:A frequency synthesizer 1 outputs a hopping signal whose frequency channel changes in prescribed sequence by a frequency control signal. It is assumed that the output signal performs frequency hopping in sequence of the frequency channels F1, F2,... as shown in figure (a). Switches 2 select the tuning type band-pass filters 3a and 3b alternately with a switching control signal with a timing (the timing synchronized with the frequency control signal) shown in Fig. (a), and the output signal is filtered and outputted from the frequency synthesizer 1. In such a way, it is possible to reduce a period where data becomes unstable at the time of switching the frequency, and to improve the transmission efficiency.

5. 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.

6. 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.

7. 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

8. 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.

9. 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。

10. 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.

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