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    • 5. 发明申请
    • Radio receiver and reserved band filter
    • 无线电接收机和保留频带滤波器
    • US20060270370A1
    • 2006-11-30
    • US11139792
    • 2005-05-31
    • Michael Bergman
    • Michael Bergman
    • H04B1/18
    • H04B1/1036
    • A radio receiver or a filter circuit for an FM radio receiver, the radio receiver or the filter circuit having a first radio frequency (RF) or band pass filter, which may be selectively electrically or operatively connected between an input and a mixer when a tuner is tuned to a first RF range, or which may be for passing a first RF range, and a second RF or band pass filter, which may be selectively electrically connected between the input and the mixer when the tuner is tuned to a second RF range, or which may be for passing a second RF range different from the first RF range. The filter circuit may have a control circuit selectively electrically or operatively connected with the first RF filter and the second RF filter for inserting the first RF filter into a signal path when the FM radio receiver is tuned.
    • 用于FM无线电接收机的无线电接收机或滤波器电路,无线电接收机或具有第一射频(RF)或带通滤波器的滤波器电路,当调谐器或调谐器可以选择性地电或操作地连接在输入和混频器之间时 调谐到第一RF范围,或者可以是用于传递第一RF范围的第二RF或第二RF或带通滤波器,当调谐器被调谐到第二RF范围时,第二RF或带通滤波器可以选择性地电连接在输入和混频器之间 ,或可以用于通过不同于第一RF范围的第二RF范围。 滤波器电路可以具有选择性地电或可操作地与第一RF滤波器和第二RF滤波器连接的控制电路,用于当调频无线电接收机调谐时将第一RF滤波器插入信号路径。