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    • 3. 发明公开
    • Mobile communication terminal having an initial frequency acquisition mechanism
    • 具有初始频率获取机制的移动通信终端
    • EP0845860A1
    • 1998-06-03
    • EP97120122.3
    • 1997-11-17
    • NEC CORPORATION
    • Ichihara, Masaki
    • H03J7/22H03J1/00
    • H03J7/22H03J1/0058
    • In a mobile communication terminal, a switch 10 is initially set to an initial setting mode at time of turning on a power supply. A reference oscillator control circuit is initialized, and in this state, the output frequency of a reference oscillator is usually greatly shifted. The base station search is first conducted, and as a result, if the base station cannot be grasped, an offset signal is generated by a frequency offset generating circuit 12, to shift the output frequency of a reference oscillator 6 through a reference oscillator control circuit 5. This operation is repeated until the base station is grasped so that the base station search is continued while the output frequency of the reference oscillator 6 is being shifted. When a grasp of the base station succeeds, the switch 10 is switched to an AFC side to conduct automatic frequency adjustment.
    • 在移动通信终端中,在打开电源时开关10最初被设置为初始设置模式。 参考振荡器控制电路被初始化,并且在这种状态下,参考振荡器的输出频率通常会大幅移动。 首先进行基站搜索,结果,如果不能掌握基站,则由频偏生成电路12生成偏移信号,以通过基准振荡器控制电路将基准振荡器6的输出频率移位 该操作重复进行,直到基站被抓住,从而在基准振荡器6的输出频率被移位的同时基站搜索继续。 当掌握基站成功时,开关10切换到AFC侧进行自动频率调整。
    • 5. 发明公开
    • A signal quality detecting circuit for FM receivers
    • Schallung zurSignalqualitätsbestimmungfürFM-Empfänger。
    • EP0430469A2
    • 1991-06-05
    • EP90312233.1
    • 1990-11-08
    • FORD MOTOR COMPANY LIMITEDFORD-WERKE AKTIENGESELLSCHAFTFORD FRANCE S. A.
    • Kennedy, John FrancisKuo, Yao Hsien
    • H04B1/16H03J7/22
    • H04B1/1027H04B1/1661
    • A signal quality detecting circuit for an FM receiver, said receiver including an IF detector generating an intensity signal indicating the received field strength of the FM signal being received and including an FM demodulator generating an automatic frequency control signal indicating a frequency error at which said FM signal is being received, said signal quality detecting circuit comprising, level detector means (32) adapted to be coupled to said IF detector for producing a first signal when said intensity signal is greater than a predetermined intensity, window detector means (33) adapted to be coupled to said FM demodulator for producing a second signal when said automatic frequency control signal is within a predetermined window, noise filter means (31) adapted to be coupled to said IF detector for generating a filtered noise signal derived from said intensity signal, said filter means rejecting frequencies containing components related to the intelligence contained in said FM signal, peak detector means (31) coupled to said noise filter means for producing a third signal when said filtered noise signal is below a predetermined peak value, and logic means coupled to said level detector means, said window detector means, and said peak detector means for producing an indicating signal (35) in response to the simultaneous occurrence of said first, second, and third signals to indicate that a high quality FM signal is being received.
    • 一种用于FM接收机的信号质量检测电路,所述接收机包括:IF检测器,产生指示正在接收的FM信号的接收场强的强度信号,并包括FM解调器,FM解调器产生指示频率误差的自动频率控制信号, 所述信号质量检测电路包括:电平检测器装置(32),适于在所述强度信号大于预定强度时与所述IF检测器耦合以产生第一信号,窗口检测器装置(33)适于 耦合到所述FM解调器,用于当所述自动频率控制信号在预定窗口内时产生第二信号,噪声滤波器装置(31)适于耦合到所述IF检测器,用于产生从所述强度信号导出的滤波噪声信号,所述噪声滤波器装置 滤波器意味着拒绝包含与所述FM中包含的智能有关的组件的频率 所述峰值检测器装置(31)耦合到所述噪声滤波器装置,用于当所述滤波噪声信号低于预定峰值时产生第三信号,以及耦合到所述电平检测器装置,所述窗口检测器装置和所述峰值检测器 用于响应于所述第一,第二和第三信号的同时发生而产生指示信号(35)的装置,以指示正在接收高质量的FM信号。
    • 10. 发明公开
    • A signal quality detecting circuit for FM receivers
    • FM接收机的信号质量检测电路
    • EP0430469A3
    • 1992-05-27
    • EP90312233.1
    • 1990-11-08
    • FORD MOTOR COMPANY LIMITEDFORD-WERKE AKTIENGESELLSCHAFTFORD FRANCE S. A.
    • Kennedy, John FrancisKuo, Yao Hsien
    • H04B1/16H03J7/22
    • H04B1/1027H04B1/1661
    • A signal quality detecting circuit for an FM receiver, said receiver including an IF detector generating an intensity signal indicating the received field strength of the FM signal being received and including an FM demodulator generating an automatic frequency control signal indicating a frequency error at which said FM signal is being received, said signal quality detecting circuit comprising, level detector means (32) adapted to be coupled to said IF detector for producing a first signal when said intensity signal is greater than a predetermined intensity, window detector means (33) adapted to be coupled to said FM demodulator for producing a second signal when said automatic frequency control signal is within a predetermined window, noise filter means (31) adapted to be coupled to said IF detector for generating a filtered noise signal derived from said intensity signal, said filter means rejecting frequencies containing components related to the intelligence contained in said FM signal, peak detector means (31) coupled to said noise filter means for producing a third signal when said filtered noise signal is below a predetermined peak value, and logic means coupled to said level detector means, said window detector means, and said peak detector means for producing an indicating signal (35) in response to the simultaneous occurrence of said first, second, and third signals to indicate that a high quality FM signal is being received.