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    Frequency converting system for FM signals
    1.
    发明公开
    Frequency converting system for FM signals 有权
    系统zur Frequenzumsetzung von FM-Signalen

    公开(公告)号：EP1178604A1

    公开(公告)日：2002-02-06

    申请号：EP01108185.8

    申请日：2001-03-30

    申请人： Icom Incorporated

    发明人： Sakurai, Kiyoshi

    IPC分类号： H03J7/06 ,  H03D3/24

    CPC分类号： H03D7/166 ,  H03D3/008 ,  H03D3/242 ,  H03J7/065

    摘要： An FM modulated signal is mixed with a pair of first local signals to be converted to a pair of base band signals by mixers (4I,4Q). The base band signals are respectively mixed with a pair of second local signals by mixers (8I,8Q). The resultant signals are added by an adder (12), thereby yielding an IF signal which is in turn detected. The local oscillator (11) generates a reference signal whose frequency is a predetermined number of times higher than the frequency of a carrier component of the IF signal and generates a second local signal by frequencing-dividing the reference signal. The frequency of the first local signal converges to the one that has a given ratio to the frequency of the reference signal.

    摘要翻译： FM调制信号与一对第一本地信号混合，以通过混频器（4I，4Q）转换成一对基带信号。 基带信号分别通过混频器（8I，8Q）与一对第二本地信号混合。 所得到的信号由加法器（12）相加，从而产生继而被检测的IF信号。 本地振荡器（11）生成频率比IF信号的载波分量的频率高出预定次数的参考信号，并通过对参考信号进行频率分频来产生第二本地信号。 第一本地信号的频率收敛于与参考信号的频率具有给定比率的频率。