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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

JPH03167928A FREQUENCY HOPPING SYNCHRONIZING DEVICE 失效
公开(公告)号：JPH03167928A
公开(公告)日：1991-07-19
申请号：JP30661689
申请日：1989-11-28
申请人： JAPAN TECH RES & DEV INST
发明人： MUTO YOSHITAKA , SAWASA HIROYUKI , TACHIKA TOSHIO
IPC分类号： H04L27/14 , H04B1/7156 , H04J13/00 , H04L27/156
摘要： PURPOSE:To attain stable synchronization within a range of an input level enabling data reproduction by taking the hopping synchronization of the frequency hopping communication system through the use of a noise level depending on the sensing and non-sensing of a frequency discriminator. CONSTITUTION:The device is provided with a data reproduction frequency discriminator 61, a noise level discriminator 62 and a data output terminal 13 in place of an envelope detector employed for a conventional device, an output of the frequency discriminator 61 is used as hopping synchronization information, a noise with a larger amplitude than the reception signal is extracted from the output of the frequency discriminator 61 by the noise level discriminator 62 and a lead/lag control circuit 9 discriminates whether or not the phase location of occurrence of noise is led or lagged from the phase of the internal frequency hopping synchronization clock and applies lead/lag control to the clock of a receiver so that the hopping synchronization of a transmitter- receiver is made coincident. Thus, the data reproduction and the hopping synchronization circuit are implemented by a common detector and the synchronization is held stably at an input level able to reproduce the data.

3. 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.

4. 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.

5. 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.

6. 发明专利

JPH01149628A FREQUENCY HOPPING SYNCHRONOUS CIRCUIT 失效
公开(公告)号：JPH01149628A
公开(公告)日：1989-06-12
申请号：JP30894387
申请日：1987-12-07
申请人： JAPAN TECH RES & DEV INST
发明人： MUTO YOSHITAKA , SAWASA HIROYUKI , IGUCHI YOSHIO , UEMURA TAKUYA
IPC分类号： H04J13/00 , H04B1/7156
摘要： PURPOSE:To obtain simple and accurate clock timing by constituting a conventional switch and integration circuit instead of a shift register and an operational amplifier and loop filter instead of a digital comparator. CONSTITUTION:A 4-stage shift register 21 operates at clocks of a period which is 1/4 of a hopping period and is connected so that the register 21 can receive carrier detecting signals outputted from a receiving circuit 1 of a receiving system. A comparator 22 compares the 1st half signal A of the register 21 with a 2nd half signal B. When the frequency hopping timing on the receiving side is faster than that on the transmission side, the carrier detecting signals become 'L' in level in the 1st half of one hopping period and 'H' in level in the 2nd half. Therefore, the content of the register 21 at the moment when one hopping period terminates is '0011' and, since the comparator 22 outputs 'A

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