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公开(公告)号：US07305219B2
公开(公告)日：2007-12-04
申请号：US11022815
申请日：2004-12-28
申请人： Mariko Matsumoto , Shigeru Ono
发明人： Mariko Matsumoto , Shigeru Ono
IPC分类号： H04B7/00
CPC分类号： H03J1/0066 , H03J7/02 , H03J7/026 , H03J2200/02 , H03L7/085 , H03L7/16 , H03L7/235
摘要： A portable radio terminal for realizing automatic frequency control (AFC) for automatically controlling the oscillation frequency of an oscillator includes a unit for intermittently performing AFC operation, and a unit for shortening an AFC operation stop period when the frequency shift of the oscillation frequency is large. An AFC control method is also disclosed.
摘要翻译： 用于实现用于自动控制振荡器的振荡频率的自动频率控制（AFC）的便携式无线电终端包括用于间歇地执行AFC操作的单元和用于缩短振荡频率的频移较大时的AFC操作停止时段的单元 。 还公开了AFC控制方法。
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公开(公告)号：US5513388A
公开(公告)日：1996-04-30
申请号：US080407
申请日：1993-06-18
申请人： Gen Suganuma
发明人： Gen Suganuma
摘要： An automatic frequency control circuit mounted on a mobile station in mobile communication. The automatic frequency control circuit performs feedback control of an oscillation frequency of a local oscillator used in conversion of a reception frequency to an intermediate frequency signal in response to the count result of the frequency of the intermediate frequency signal. If a receiver is not in the hand-off state, counting is performed for comparatively long time; if in the hand-off state, counting is performed for comparatively short time conforming to required stabilization performance at hand off. Occurrence of variations in count values caused by fading is detected, and only the count values worthy of trust are used as a base of control. A level drop caused by fading is compensated by self-oscillation.
摘要翻译： 一种安装在移动台上的自动频率控制电路。 响应于中频信号的频率的计数结果，自动频率控制电路对接收频率转换为中频信号的本地振荡器的振荡频率进行反馈控制。 如果接收机不处于切换状态，则进行相对较长时间的计数; 如果处于切换状态，则在相当短的时间内进行计数，以符合所需的稳定性能。 检测到由衰落引起的计数值变化的发生，只有值得信任的计数值被用作控制的基础。 由衰落引起的电平降低由自振振荡补偿。
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公开(公告)号：US5457716A
公开(公告)日：1995-10-10
申请号：US188981
申请日：1994-01-31
申请人： Yi M. G. G. Ang , Cheng H. Ho
发明人： Yi M. G. G. Ang , Cheng H. Ho
摘要： A selective call radio frequency (RF) communication device (105) includes a receiver (203) for receiving and converting an RF signal into a converted signal. A controller (206) generates binary message information, a synchronization command signal and an address detection signal. An alert device (207) indicates the receipt of the message information. A frequency counter (427) measures the frequency of the converted signal and also determines the associated binary state of the binary message information. A measurement memory (439) stores the converted signal frequency measurements. The frequency control generator (440) generates a frequency control signal in response to the synchronization command signal being generated. The frequency control signal is a function of the stored converted signal frequency measurements and the associated binary states. The controllable local oscillator (215) supplies a local oscillator signal to the receiver, the local oscillator signal having a frequency controlled by the frequency control signal.
摘要翻译： 选择呼叫射频（RF）通信设备（105）包括用于接收RF信号并将其转换为转换信号的接收机（203）。 控制器（206）生成二进制消息信息，同步命令信号和地址检测信号。 警报装置（207）指示接收到消息信息。 频率计数器（427）测量转换信号的频率，并且还确定二进制消息信息的相关二进制状态。 测量存储器（439）存储经转换的信号频率测量。 频率控制发生器（440）根据产生的同步命令信号产生频率控制信号。 频率控制信号是存储的转换信号频率测量值和相关联的二进制状态的函数。 可控本地振荡器（215）向接收机提供本地振荡器信号，本地振荡器信号具有由频率控制信号控制的频率。
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公开(公告)号：US4910470A
公开(公告)日：1990-03-20
申请号：US285147
申请日：1988-12-16
申请人： David E. Borth , James F. M. Kepler
发明人： David E. Borth , James F. M. Kepler
摘要： There is provided a method of and apparatus for Automatic Frequency Control (AFC) of pure sine waves (PSW). It comprises discriminating to detect frequency differences between a received pure sine wave and a reference frequency, integrating the frequency differences to average the differences, and adjusting the reference frequency to eliminate the frequency difference. It is further characterized by digitizing, in quadrature, the received pure sine wave, mixing the received pure sine wave with a complex sinusoid to translate the pure sine wave to baseband, quadrature filtering the mixed sine wave, cross-product discriminating to detect frequency differences between a received pure sine wave and a reference frequency, integrating the frequency differences to average the differences, selectively calculating the mean variance between the pure sine wave and the reference frequency, and adjusting the reference frequency of a Voltage Controlled Oscillator to eliminate the frequency difference.
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公开(公告)号：US3611152A
公开(公告)日：1971-10-05
申请号：US3611152D
申请日：1968-07-12
摘要： An automatic tuning device using pure electrically variable reactance elements as tuning elements for an antenna-tuning circuit, high-frequency tuning circuit, local oscillator circuit and the like in a receiver, said automatic tuning device being capable of positively maintaining the receiver tuned to a received frequency even if a field intensity varies or becomes extinct and effecting correction control to provide accurate tuning constants concurrently with signal selection during the automatic signal-seeking operation.
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公开(公告)号：US3110021A
公开(公告)日：1963-11-05
申请号：US85660559
申请日：1959-12-01
发明人： WALLER HERBERT H
CPC分类号： H03J7/026 , G01S1/02 , G01S7/4008 , G05D3/12
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公开(公告)号：US07606545B2
公开(公告)日：2009-10-20
申请号：US11023161
申请日：2004-12-28
申请人： Mariko Matsumoto , Shigeru Ono
发明人： Mariko Matsumoto , Shigeru Ono
IPC分类号： H04B1/06
CPC分类号： H03J1/0066 , H03J7/02 , H03J7/026 , H03J2200/02 , H03L7/085 , H03L7/16 , H03L7/235
摘要： A portable radio terminal for realizing automatic frequency control (AFC) for automatically controlling the oscillation frequency of an oscillator includes a unit for intermittently performing AFC operation, and a unit for shortening an AFC operation stop period when the frequency shift of the oscillation frequency is large. An AFC control method is also disclosed.
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公开(公告)号：US07474717B2
公开(公告)日：2009-01-06
申请号：US10535632
申请日：2003-11-20
申请人： Bo Lindell , Robert Kristiansson
发明人： Bo Lindell , Robert Kristiansson
IPC分类号： H04L27/06
CPC分类号： H04L27/12 , H03J1/0041 , H03J7/026 , H03J2200/02 , H03L1/00 , H03L1/02 , H03L7/14
摘要： A control unit supplies a new control value to a frequency source. The value is determined by the frequency source frequency and the reference frequency. The control unit further calculates a rate of change value based at least on the new and a previous control value if there is communication with the reference frequency generator and stores these values in corresponding stores. Another control unit calculates a new control value based on the rate of change value from the rate of change store and the last used control value from the control value store and supplies the new control value to the frequency source if there is no communication with the reference generator.
摘要翻译： 控制单元向频率源提供新的控制值。 该值由频率源频率和参考频率决定。 如果与参考频率发生器进行通信，则控制单元至少基于新的和先前的控制值来计算变化率值，并将这些值存储在相应的存储器中。 另一个控制单元基于来自控制值存储器的变化率存储器和最后使用的控制值的变化率值来计算新的控制值，并且如果不与参考值通信，则将新的控制值提供给频率源 发电机。
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公开(公告)号：US07043216B2
公开(公告)日：2006-05-09
申请号：US10052777
申请日：2002-01-23
申请人： Mariko Matsumoto , Shigeru Ono
发明人： Mariko Matsumoto , Shigeru Ono
IPC分类号： H04B1/06
CPC分类号： H03J1/0066 , H03J7/02 , H03J7/026 , H03J2200/02 , H03L7/085 , H03L7/16 , H03L7/235
摘要： A portable radio terminal for realizing automatic frequency control (AFC) for automatically controlling the oscillation frequency of an oscillator includes a unit for intermittently performing AFC operation, and a unit for shortening an AFC operation stop period when the frequency shift of the oscillation frequency is large. An AFC control method is also disclosed.
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公开(公告)号：US20060013345A1
公开(公告)日：2006-01-19
申请号：US10535632
申请日：2003-11-20
申请人： Bo Lindell , Robert Kristiansson
发明人： Bo Lindell , Robert Kristiansson
IPC分类号： H04L27/06
CPC分类号： H04L27/12 , H03J1/0041 , H03J7/026 , H03J2200/02 , H03L1/00 , H03L1/02 , H03L7/14
摘要： A control unit supplies a new control value to a frequency source. The value is determined by the frequency source frequency and the reference frequency. The control unit further calculates a rate of change value based at least on the new and a previous control value if there is communication with the reference frequency generator and stores these values in corresponding stores. Another control unit calculates a new control value based on the rate of change value from the rate of change store and the last used control value from the control value store and supplies the new control value to the frequency source if there is no communication with the reference generator.
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