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    • 4. 发明授权
    • Digital broadcast receiving tuner and receiving device incorporating it
    • 数字广播接收调谐器和包含它的接收设备
    • US07515886B2
    • 2009-04-07
    • US10775225
    • 2004-02-11
    • Hitoshi Ogino
    • Hitoshi Ogino
    • H04B17/02
    • H04W52/52H03G3/3052H03J7/02
    • In a digital broadcast receiving tuner, a down-converter unit converts a high-frequency signal into a baseband signal directly or by once converting it into an intermediate frequency signal. A gain adjuster unit properly adjusts the actual level of the high-frequency signal and/or the intermediate frequency signal in correspondence with an AGC (automatic gain control) controlling voltage supplied from an external source. An amplifier properly adjusts the actual level of the baseband signal. A controlling unit properly controls the actual gain of the amplifier in response to a specific signal independent of the AGC controlling voltage. This configuration makes it possible to constantly secure optimal performance characteristics in whatever condition the received signal may be.
    • 在数字广播接收调谐器中,下转换器单元将高频信号直接转换成基带信号,或者将其转换成中频信号。 增益调节单元根据从外部源提供的AGC(自动增益控制)控制电压,适当调整高频信号和/或中频信号的实际电平。 放大器正确调整基带信号的实际电平。 控制单元响应于独立于AGC控制电压的特定信号,适当地控制放大器的实际增益。 该配置使得可以在接收信号可能的任何条件下不断地确保最佳性能特性。