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    • 4. 发明申请
    • Automatic frequency control processing in multi-channel receivers
    • 多通道接收机中的自动频率控制处理
    • US20040214538A1
    • 2004-10-28
    • US10421002
    • 2003-04-22
    • MOTOROLA, INC.
    • Wayne Wiggins BallantyneThomas Michael King
    • H04B001/00H04B007/00
    • H03J1/0083H03J1/0033H03J1/0041H03J3/185H03J2200/02H03J2200/11
    • A multiple channel receiver (200) includes a communications receiver synthesizer (204) and at least one numerically controlled oscillator (NCO) (406) that produce local oscillator signals that are derived from a common reference oscillator (202). A DSP (212) and CPU (214) perform automatic frequency control (AFC) by adjustment of the reference oscillator (202) based upon a signal received by a receive channel using the local oscillator signal produced by the communications receiver synthesizer (204). The CPU (214) also provides a synchronous indication of adjustments to the reference oscillator (202) to control circuitry for the at least one NCO (406) so that the configuration of the NCO (406) can be altered so as to maintain a substantially constant frequency output during the adjustment of the reference oscillator (202).
    • 多通道接收器(200)包括通信接收机合成器(204)和产生从公共参考振荡器(202)导出的本地振荡器信号的至少一个数控振荡器(NCO)(406)。 DSP(212)和CPU(214)通过使用由通信接收机合成器(204)产生的本地振荡器信号由接收信道接收的信号来调整参考振荡器(202)来执行自动频率控制(AFC)。 CPU(214)还向参考振荡器(202)提供对于至少一个NCO(406)的控制电路的调整的同步指示,使得可以改变NCO(406)的配置,以便保持基本上 在调整参考振荡器(202)期间的恒定频率输出。
    • 8. 发明授权
    • Channel sorting scanning receiver
    • 频道排序扫描接收机
    • US5551071A
    • 1996-08-27
    • US196427
    • 1994-02-15
    • Yasuyoshi NakanoSeiji Harada
    • Yasuyoshi NakanoSeiji Harada
    • H03J1/00H03J7/28H04B1/18
    • H03J7/285H03J1/0041
    • A scan receiving system comprising an antenna circuit, a radio-frequency reception circuit connected to the antenna circuit and for converting a received radio-frequency signal into an audio-frequency signal, an audio-frequency circuit connected to the radio-frequency reception circuit and for amplifying the audio-frequency signal supplied from the radio-frequency reception circuit, an input circuit for inputting a desired reception frequency, and a controller connected to the radio-frequency reception circuit, the audio-frequency circuit and the input circuit, the controller including a plurality of channel memories which are provided in one-to-one correspondence with a plurality of carrier frequency channels so that a plurality of desired reception frequencies inputted through the input circuit are programmed in the plurality of channel memories, the frequencies programmed in the plurality of channel memories being scanned in the order of frequency ascending or descending in accordance with a scan instruction inputted through the input circuit to perform tuning to a reception signal in the radio-frequency reception circuit by successively using the programmed frequencies as reference values to thereby perform reception of a signal from a desired station.
    • 一种扫描接收系统,包括天线电路,连接到天线电路的射频接收电路,并将接收到的射频信号转换为音频信号,连接到射频接收电路的音频电路和 用于放大从射频接收电路提供的音频信号,输入所需接收频率的输入电路,以及连接到射频接收电路,音频电路和输入电路的控制器,控制器 包括与多个载波频率信道一一对应地提供的多个信道存储器,使得通过输入电路输入的多个期望接收频率被编程在多个信道存储器中,在 多个频道存储器按照频率上升或下降的顺序被扫描 以通过输入电路输入的扫描指令,通过连续地使用编程的频率作为参考值来执行对射频接收电路中的接收信号的调谐,从而执行从期望的站的信号的接收。
    • 10. 发明授权
    • Frequency tunable arrangement
    • 频率可调配置
    • US07885623B2
    • 2011-02-08
    • US11629157
    • 2005-05-25
    • Fateh M. SinghVincent FillatreAbdelilah Faleh
    • Fateh M. SinghVincent FillatreAbdelilah Faleh
    • H04B1/16H03B19/00
    • H03J1/0041
    • A frequency tunable arrangement (ICT) comprises a tunable oscillator circuit (TOC) that provides an oscillator signal (OS). A controllable frequency divider circuit (CDIV, DBT1, DBT2, DBT3, MUX) provides a frequency-divided signal (MO) on the basis of the oscillator signal. The frequency-divided signal has a frequency that is equal to the frequency of the oscillator signal divided by a division factor. The controllable frequency divider circuit provides any division factor among a set of division factors (4, 5, 6, 7, 8) in which for any division factor a ratio between that division factor and a lower division factor closest thereto, if existing, does not exceed 1.25.
    • 频率可调配置(ICT)包括提供振荡器信号(OS)的可调振荡器电路(TOC)。 可控分频器电路(CDIV,DBT1,DBT2,DBT3,MUX)基于振荡器信号提供分频信号(MO)。 分频信号的频率等于振荡器信号的频率除以除法因子。 可控分频器电路在一组除法因子(4,5,6,7,8)中提供任何分频因子,其中对于任何分频因子,该分频因子与最接近的分频因子之间的比率(如果存在)为 不超过1.25。