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1. 发明申请

WO2010051179A2 RF TRANSMITTER AND METHOD OF OPERATION 审中-公开
标题翻译： RF发射机和操作方法
公开(公告)号：WO2010051179A2
公开(公告)日：2010-05-06
申请号：PCT/US2009061219
申请日：2009-10-20
申请人： MOTOROLA INC , KODNER LIONID , BLAY GENADI , KAUFMAN KALMAN , YACOBI AVISHAI A
发明人： KODNER LIONID , BLAY GENADI , KAUFMAN KALMAN , YACOBI AVISHAI A
IPC分类号： H04L25/02 , H04B1/04 , H04L27/34
CPC分类号： H04L27/368 , H04L27/364 , H04L2027/0016 , H04L2027/0018
摘要： An RF transmitter (100) for transmitting a QAM signal includes a baseband signal generator (101) to produce a baseband modulation signal, a phase shifter (133) to apply a change in phase affecting the baseband signal or a signal derived from it or to mixed with such a signal, a phase shift controller (131) to apply a control signal to control the phase shifter, and an analyzer (126) to analyze the baseband signal to detect low signal periods when a parameter which is a function of amplitude of the signal is not greater than a threshold, the phase shift controller being operable to receive from the analyzer an indication of the low signal periods and to apply the control signal so that the change in phase is applied by the phase shifter only during a selected period when the affected signal has a low power corresponding to a low signal period of the baseband signal.
摘要翻译：用于发送QAM信号的RF发送器（100）包括：产生基带调制信号的基带信号发生器（101）;移相器（133），用于施加影响基带信号的相位变化或从中产生的信号或与这样的信号混合的移相控制器（131），用于施加控制信号以控制移相器;以及分析器（126），用于分析基带信号以检测低信号周期，当参数是幅度所述信号不大于阈值，所述相移控制器可操作以从所述分析器接收所述低信号时段的指示并施加所述控制信号，使得仅在选定时段期间由所述移相器施加所述相位变化当受影响的信号具有对应于基带信号的低信号周期的低功率时。

2. 发明申请

WO2010080374A3 METHOD AND SYSTEM FOR REDUCING HOWLING IN A HALF-DUPLEX COMMUNICATION SYSTEM 审中-公开
标题翻译：用于减少双工通信系统中的故障的方法和系统
公开(公告)号：WO2010080374A3
公开(公告)日：2010-10-07
申请号：PCT/US2009067957
申请日：2009-12-15
申请人： MOTOROLA INC , GEAN NISSIM , AVAYU ITZHAK , YACOBI AVISHAI A
发明人： GEAN NISSIM , AVAYU ITZHAK , YACOBI AVISHAI A
IPC分类号： H04W88/02 , H04W4/10
CPC分类号： H04B1/44 , H04M9/08
摘要： A method for reducing howling in a half-duplex communication system containing radios is presented. Prior to receiving an audio signal transmitted from a sending radio to receiving radios in the half-duplex communication system, the sending radio emits a talk-permit tone from a speaker. If any receiving radios are sufficiently close to the sending radio, they receive the talk-permit tone on their microphones. In that event, those radios, detect whether the talk-permit tone exceeds a predetermined threshold, and if that result occurs, the volume of each detecting radio speaker is automatically limited to a maximum allowed volume.
摘要翻译：提出了一种用于减少包含无线电的半双工通信系统中的啸声的方法。在从发送无线电发送到在半双工通信系统中接收无线电的音频信号之前，发送无线电从扬声器发出通话许可音。如果任何接收无线电台充分靠近发射无线电台，他们将在麦克风上接收到通话许可音。在这种情况下，这些无线电装置检测通话允许音是否超过预定阈值，如果发生该结果，则每个检测无线电扬声器的音量被自动限制为允许的最大音量。

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