专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

21. 发明专利

JPS56132828A SPACE DIVERSITY RECEIVING DEVICE 失效
公开(公告)号：JPS56132828A
公开(公告)日：1981-10-17
申请号：JP3629980
申请日：1980-03-24
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAJIMA KOUJIROU , KOMAKI SHIYOUZOU , OKAMOTO SHIGEHARU
IPC分类号： H04B7/08
摘要： PURPOSE:To prevent an omission of a picture frame synchronizing signal, by detecting a resultant power level of the space diversity receiving device through the narrow band filter of specific frequency. CONSTITUTION:Signals which have been received by the main and subsidiary antennas of 1 and 2 are synthesized by the power compounding device 5 through the phase shifter 3 and the phase modulator 4, respectively, also the composite signal is converted to an intermediate frequency signal by the receiving local oscillator 7 and the frequency mixer 6, is amplified by the preamplifier 8, and is provided to the main intermediate amplifier 9 having an AGC function. After that, the output of the preamplifier 8 is partially provided to the level detector 15 through the narrow band filter 14, and its output is inputted to the phase detector 12. The level of said level detector 15 is a level of passing frequency of the filter 14, and by handling this detector output in the same way as regular AGC voltage, in-phase synthesis is executed by said frequency.

22. 发明专利

JPS5672548A SPACE DIVERSITY RECEIVING SYSTEM 失效
公开(公告)号：JPS5672548A
公开(公告)日：1981-06-16
申请号：JP14886779
申请日：1979-11-19
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOMAKI SHIYOUZOU , OKAMOTO SHIGEHARU , HORIKAWA IZUMI
IPC分类号： H04B7/08
摘要： PURPOSE:To compound the interference wave components contained in the signals so that they can be antiphase to each other, and flatten the frequency characteristic, by compounding the signals received by 2 sets of antennas so that the in-band deviation can be reduced. CONSTITUTION:The signals e1 and e2 received by 2 sets of antennas 1, 4 are made to pass through the phase modulator 2 and the phase shifter 5, respctively, and after that, they are compounded by the compounding device 3, and are converted to the IF signal having a constant signal level by the receiver 6. This IF signal is provided to the band characteristic detection circuit 8, the amplitude after compounding or the delay frequency characteristic is observed, and the necessary in-band amplitude or the delay deviation is detected. This in-band deviation signal is provided to the control circuit 9, the phase shifter 5 is controlled, and the deviation is reduced.

23. 发明专利

JPS5374866A PREEPOSITIONED NONNLINEAR DISTORTION REDUCING DEVICE 失效
公开(公告)号：JPS5374866A
公开(公告)日：1978-07-03
申请号：JP15137776
申请日：1976-12-15
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NOJIMA TOSHIO , OKAMOTO SHIGEHARU
IPC分类号： H03F1/32
摘要： PURPOSE:To secure such constitution that the distortion element of the main amplifier is reduced without receiving any limitation of the distortion amount of a distortion generator, and thus to improve the non-linear distortion of a large-power amplifier by using a distortion generator featuring a reduced distortion generation amount.

24. 发明专利

JPH06334582A INFORMATION GUIDE SYSTEM AND PORTABLE RADIO EQUIPMENT 失效
公开(公告)号：JPH06334582A
公开(公告)日：1994-12-02
申请号：JP11882293
申请日：1993-05-20
申请人： NIPPON TELEGRAPH & TELEPHONE , NTT ADVANCED TECH KK
发明人： MASUDA JUNICHI , ARITA KISHIO , OKAMOTO SHIGEHARU , NAGAI YOSHIHIRO , ISHII NAOKI
IPC分类号： H04B7/26
摘要： PURPOSE:To provide the personal information guidance system through which desired information can be known from the head part at all times. CONSTITUTION:When the portable radio equipment 1 sends a communication request to a radio connection device 2 by using a control channel CHc, the radio connection device 2 searches for a free channel from among communication channels CH1-CHn and sends information indicating its number back to the portable radio equipment 1 through the control channel CHc. Then the portable radio equipment 1 sets the frequency of the indicated communication channel, and consequently the radio connection device 2 and portable radio equipment 1 are completely connected. Then when an operator inputs a desired information number through the portable radio equipment 1, this information number is sent to an information storage device 3 through the radio connection device 2 and the information storage device 3 after taking out and temporarily storing the information corresponding to the information number transfers it to the portable radio equipment 1 through the radio connection device 2.

25. 发明专利

JPH01225228A SSB TRANSMISSION EQUIPMENT 失效
公开(公告)号：JPH01225228A
公开(公告)日：1989-09-08
申请号：JP5080388
申请日：1988-03-04
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OKAMOTO SHIGEHARU , OGURO KAZUHIRO
IPC分类号： H03C1/52 , H04B1/04
摘要： PURPOSE:To stably generate the SSB signal of large power with high efficiency by converting an original modulating signal to two circular function signal, obtaining sum and difference signals with executing the balance modulation of an output, amplifying the respective signals and after that, synthesizing the signals. CONSTITUTION:The original modulating signal is inputted through a converter 2 to a cosine function converter 3 and a sine function converter 4 and converted to the two circular function signals. These circular function signals are balance- modulated with carriers, which are mutually different by 90 deg., by the output of a local oscillator 6 and the sum signal and difference signal of those outputs are obtained in an adding circuit 10 and a subtracting circuit 11. These output signals are amplified by amplifiers 12 and 13 and after that, they are synthesized by adding circuits 14 and 16 and a subtracting circuit 15. Then, the output is conducted through a filter 17.

26. 发明专利

JPS623533A MOBILE RADIO COMMUNICATION SYSTEM 失效
公开(公告)号：JPS623533A
公开(公告)日：1987-01-09
申请号：JP14326485
申请日：1985-06-29
申请人： NIPPON TELEGRAPH & TELEPHONE , MITSUBISHI CORP
发明人： OKAMOTO SHIGEHARU , MONMA KOJI , SEKI SEIZO , TAKECHI SUMIO , YAMADA MASARU
IPC分类号： H04Q7/06 , H04B1/38 , H04B7/26 , H04Q7/24 , H04Q7/26 , H04Q7/28 , H04Q7/34 , H04Q7/38
摘要： PURPOSE:To start easily conversation between a mobile radio equipment and a center equipment by allowing the mobile radio equipment to send an identification signal assigned specifically to the said mobile radio equipment as a transmission request radio wave signal and receiving the signal by plural radio base stations. CONSTITUTION:When a sending request button of the mobile radio equipment 3 is operated, a control circuit 36 of the mobile radio equipment confirms the presence of sending restriction and the presence of a carrier sent by other station and then sends a transmission request signal as a radio wave signal. When a signal from a radio base station 2 comes to the center equipment 1, an alarm tone alarming a recipient and the signal from plural radio base stations 2 is analyzed. When the center equipment 1 identifies the signal to be the communication request signal, a communication restriction signal is sent from the control circuit of the center equipment 1 to each radio base station 2. Since the identification signal included in the communication restriction signal is coincident with the own identification signal in the mobile radio equipment 3 sending the communication request signal, an amplifier 34 of the reception circuit and an amplifier 38 of the transmission circuit are operated.

27. 发明专利

JPS60223339A BATTERY SAVING SYSTEM 失效
公开(公告)号：JPS60223339A
公开(公告)日：1985-11-07
申请号：JP7966184
申请日：1984-04-20
申请人： NIPPON TELEGRAPH & TELEPHONE , MITSUBISHI CORP
发明人： OKAMOTO SHIGEHARU , MONMA KOUJI , SEKI SEIZOU , TAKECHI SUMIO , YAMADA MASARU
IPC分类号： H04B1/16 , H04Q7/08 , H04Q7/12 , H04W52/02
摘要： PURPOSE:To attain correspondence to an individual call from a radio base station and also to reduce battery consumption by providing a timer and a reception level detecting circuit, applying a power supply current to a part detecting a reception level by a short time DELTAt at each period T during the standby by the timer to detect a burst state signal transmitted ahead the control signal from the radio base station. CONSTITUTION:A reception level detecting circuit 26 detecting a reception level of a burst signal having a duration time L transmitted prior to the transmission signal of the control signal from a radio base station 2 through the branched output of an intermediate frequency amplifier 16 and a timer 27 outputting a signal by a short time DELTAt at each period T shorter by a time G than the duration time L are provided in a radio mobile equipment, the detected output of the reception level detection circuit 26 and the output of the timer 27 are connected respectively to the control circuit 24, a power supply current is fed to a reception level detecting part shown in one-dashed chain lines when a signal is outputted from the timer 27, and when the detected output of the reception level detecting circuit 26 exists, the power supply current is applied continuously to a transmission/reception circuit to start the control circuit 24.

28. 发明专利

JPS596534B2 JPS596534B2 - 失效
公开(公告)号：JPS596534B2
公开(公告)日：1984-02-13
申请号：JP4280
申请日：1980-01-07
申请人： Nippon Telegraph & Telephone
发明人： OKAMOTO SHIGEHARU , KOMAKI SHOZO , TAJIMA KOJIRO , KIMURA TOORU
IPC分类号： H04B7/08
CPC分类号： H04B7/084

29. 发明专利

JPS5851632A RADIO RELAY SYSTEM 失效
公开(公告)号：JPS5851632A
公开(公告)日：1983-03-26
申请号：JP14963781
申请日：1981-09-24
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TOOYAMA HIDEKI , OKAMOTO SHIGEHARU , NOJIMA TOSHIO , NAKAJIMA NOBUO , NARA TAKEJI
IPC分类号： H04B7/15 , H04B1/52 , H04B7/155
摘要： PURPOSE:To eliminate the blocking of a relay function, by adjusting a phase amplitude adjusting circuit so that the correlation between a detected signal and a specific modulation signal can be zeroed and cancelling a detour signal between transmission and reception antennas. CONSTITUTION:An output signal of a synthesizer 4 is modulated at a modulator 7 and a modulation signal generator 8, amplified 3 for relay and transmitted via a branching filter 5 and a transmission antenna 2. A normal signal out of signals inputted to the amplifier 3 is not subject to a low frequency amplitude modulation, but an interference signal and a feedback signal are subject to the low frequency amplitude modulation. A signal branched at a reception input branching filter 9 is envelope-detected 10 and components in correlation with the modulation signal from the generator 8 out of detected outputs are specified for the relation of phase and amplitude of the interference signal versus the feedback signal. When the correlation component is zero, both the signals are made to the opposite phase equal amplitude.

30. 发明专利

JPS5817710A SWEEP OSCILLATOR 失效
公开(公告)号：JPS5817710A
公开(公告)日：1983-02-02
申请号：JP11437081
申请日：1981-07-23
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NOJIMA TOSHIO , NAGANO KENJI , OKAMOTO SHIGEHARU
IPC分类号： H03B23/00
摘要： PURPOSE:To supply a frequency with very high accuracy in a short time, by detecting and correcting the error of oscillating frequency at each sweep. CONSTITUTION:An output frequency of a voltage controlled oscillator 1 is converted into a suitable low frequency at a frequency converter 12 with respect to an arbitrary frequency and inputted to a programmable counter 15 with gate circuit 14. The counter 15 counts the number of signal waves during the open time of the gate 14 and outputs the difference with a reference number. This difference is added with control voltage information to the present oscillation frequency stored in a memory 18 and temporarily stored to a latch circuit 17 as the oscillation frequency controlling voltage information at the next sweep. The memory is rewritten with the control voltage information after the correction and waits for the next sweep. The storage in a circuit 17 is coverted into an analog control voltage with a D/A converter 20 to control the oscillation frequency of the oscillator 1.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式