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公开(公告)号：JP2003032141A
公开(公告)日：2003-01-31
申请号：JP2001214822
申请日：2001-07-16
申请人： Audio Technica Corp , 株式会社オーディオテクニカ
发明人： HARIMA TATSUJI
摘要： PROBLEM TO BE SOLVED: To provide a two-way wireless communication device that can prevent reception interference due to a leaked signal from its own transmission circuit in a reception mode.
SOLUTION: The two-way wireless communication device is provided with a control means 15 that revises an oscillated frequency of the transmission circuit 11 to a standby state frequency f2 giving no interference onto a received frequency of a reception circuit 12 in the reception mode and restores the oscillated frequency of the transmission circuit 11 to a transmission frequency f1 the same as the reception frequency in a transmission mode in the bidirectional wireless communication device that adopts the same frequency for the transmission frequency and the reception frequency and conducts two- way communication by alternately selecting the transmission mode or the reception mode.
COPYRIGHT: (C)2003,JPO摘要翻译： 要解决的问题：提供一种双向无线通信装置，其能够在接收模式中防止来自其自身的发送电路的泄漏信号的接收干扰。 解决方案：双向无线通信设备设置有控制装置15，其将发送电路11的振荡频率修改为在接收模式中对接收电路12的接收频率不产生干扰的待机状态频率f2，并恢复 传输电路11的振荡频率与在双向无线通信设备中的传输模式中的接收频率相同的传输频率f1，其采用相同的频率用于传输频率和接收频率，并且通过交替地进行双向通信 选择传输模式或接收模式。
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公开(公告)号：JP2002330085A
公开(公告)日：2002-11-15
申请号：JP2001131307
申请日：2001-04-27
申请人： ALPS ELECTRIC CO LTD
发明人： IZUMIYAMA TORU
摘要： PROBLEM TO BE SOLVED: To simplify the constitution and reduce the cost by lessening the parts to be used. SOLUTION: This transceiver is equipped at least with first, second, and third changeover switches 3, 6, and 12 for switching a transmission mode and a reception mode, a power amplifier 4, an intermediate frequency circuit 13 on transmission side, a low-noise amplifier 5, an intermediate frequency circuit 14 on reception side, and a mixer 8 for frequency conversion, and first changeover switch 3 is provided between the power amplifier 4 and the low-noise amplifier 5, and the second changeover switch 6 is provided between the power amplifier 4 and the low-noise amplifier 5 and the mixer 8, and the third changeover switches 12 is provided between the mixer 8 and the intermediate frequency circuit 13 on transmission side and the intermediate frequency circuit 14 on reception side, and the mixer 8 is constituted of a passive mixer having a bidirectional function.
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公开(公告)号：JP2002198859A
公开(公告)日：2002-07-12
申请号：JP2000394325
申请日：2000-12-26
摘要： PROBLEM TO BE SOLVED: To provide a compact and low-power consumption transmitter-receiver. SOLUTION: A first image rejection mixer 1 mixes a received signal with a first local signal having a frequency lower by a half the channel frequency spacing than a desired channel frequency. A second image rejection mixer 2 mixes a reception signal with a second local signal having the same frequency as the channel frequency spacing with an intermediate frequency signal, and outputs a resultant signal to a demodulator circuit. For transmission, the frequency of a first local signal source is changed.
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25.发明专利
公开(公告)号：JP2002118489A
公开(公告)日：2002-04-19
申请号：JP2001219893
申请日：2001-07-19
申请人： CIT ALCATEL
摘要： PROBLEM TO BE SOLVED: To provide a method for selecting a radio channel where, allocated to both transmission directions simultaneously at different units, possibility of interference is reduced, related to an asymmetric radio communication system. SOLUTION: When a first remote unit 11 wishes to set up a communication with a first fixed unit 12, both units explore, independently, the signal level present in each one of the available radio channels. Once the first fixed unit 12 knows a radio channels not suitable to set up the communication for it, it broadcasts this to the remote unit 11. Next, the first remote unit 11 must pair one of the radio channels suitable for the first fixed unit 12 with one of those suitable for it. If the first remote unit 11 finds an available radio channel suitable for the two units, the desired communication is established over the radio channel available and suitable for both units. If it does not manage to find a radio channel available and suitable for both units, then the process is repeated.
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公开(公告)号：JP2002016525A
公开(公告)日：2002-01-18
申请号：JP2000196549
申请日：2000-06-29
申请人： SEIKO PRECISION KK
发明人： ONOZUKA MASANAO
IPC分类号： H04B1/54
摘要： PROBLEM TO BE SOLVED: To provide a wireless communication unit that easily sets the operating frequency to a frequency which will not cause crosstalks. SOLUTION: The wireless communication unit is provided with: a transmission section 1 that transmits a 1st signal with a desired frequency; a reception section 2 that receives a 2nd signal that is transmitted with a desired frequency; and a frequency setting circuit 3 that sets the desired frequency; and further a reception strength measurement circuit 4 that measures the reception strength of the 2nd signal. A control circuit 5 sequentially revises the desired frequency set by the frequency setting circuit 3, in a state with a transmission reception section 1 making no transmission, and monitors the reception strength of the 2nd signal measured by the reception strength measurement circuit 4 by each desired frequency that is set, while being revised sequentially. It is preferred that the frequency with the smallest reception strength be set to be the desired frequency. Moreover, it is preferred that a display section 6 display the measured reception strength.
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公开(公告)号：JP2001186204A
公开(公告)日：2001-07-06
申请号：JP36859499
申请日：1999-12-27
发明人： ADACHI MASARU
摘要： PROBLEM TO BE SOLVED: To provide digital radio equipment which can correct required frame timing even in the case of using an antenna switch and in which the timing is not greatly shifted even when long-time transmission such as data transmission is performed. SOLUTION: This equipment has a receiver provided with a timing reproducing means for reproducing a reproduction symbol clock signal, a frame reproducing means reproducing a received frame signal, a reference oscillating means for generating a reference symbol clock signal and a reference clock signal, and a timing error detecting/correcting means for generating a transmission frame signal with corrected timing with a received signal from the reproduction symbol clock signal, the reference symbol clock signal, the reference clock signal and the received frame signal, a transmitter provided with a modulating means that constructs the transmission data frame of an information signal on the basis of the transmission frame signal and outputs a transmission signal obtained by modulating a carrier signal, and the antenna switch switching the received signal and the transmission signal. The equipment detects the error of the reference symbol clock signal when the received signal is received and corrects the timing of the transmission frame signal when the transmission signal is transmitted.
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公开(公告)号：JP2001168811A
公开(公告)日：2001-06-22
申请号：JP34759899
申请日：1999-12-07
发明人： FUKUMA YUICHIRO , HOSHINA YASUSHI
摘要： PROBLEM TO BE SOLVED: To provide a transmitter-receiver that can obtain a desired wave by suppressing an interference wave, even when a signal level of the interference wave is higher than that of the desired wave to a degree that the level exceeds a dynamic range of an analog/digital converter. SOLUTION: This transmitter-receiver is provided with a transmission signal generating means 1, a 1st digital/analog converter 2a that applies digital/analog conversion to an output of the transmission signal generating means 1, a 1st transmitter 3a that transmits an output of the 1st digital/analog converter 2a, a transmission antenna 4 that emits an output of the 1st transmitter 3a, a receiving antenna 6 that receives an object received signal and an interference signal emitted from the transmitting antenna 4, an adaptive filter 5 that converts the output of the transmission signal generating means 1 into a signal with an opposite phase to and equal amplitude to those of the interference signal, a 2nd digital/analog converter 2b that applies digital/ analog conversion to an output of the adaptive filter 5, a 2nd transmitter 3b that transmits an output of the 2nd digital/analog converter 2b, a synthesizer 7 that synthesizes an output of the 2nd transmitter 3b with an output of the reception antenna 6, a receiver 8 that receives an output of the synthesizer 7 and an analog/digital converter 9, that applies analog/digital conversion to an output of the receiver 8.
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公开(公告)号：JP2000286742A
公开(公告)日：2000-10-13
申请号：JP9178599
申请日：1999-03-31
申请人： TOSHIBA CORP
发明人： TORII KENICHI
摘要： PROBLEM TO BE SOLVED: To obtain a radio communication unit that transmits data at a high speed without using a frequency synthesizer that switches a frequency at a high speed. SOLUTION: This radio communication unit is provided with an antenna input section 100, a reception section 120, a transmission section 150, and an input output section 200. A voltage controller oscillator 132 in the reception section 120 is utilized for both transmission and reception. Since the frequency outputted from a voltage controlled oscillator 132 is made identical to both and transmission and reception, the switching between the transmission and the reception is instantly conducted and then the time slots can effectively be utilized and high speed transmission is attained.
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