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    • 2. 发明申请
    • TELEVISION RECEPTION CIRCUIT AND TELEVISION RECEPTION APPARATUS
    • 电视接收电路和电视接收装置
    • US20080211970A1
    • 2008-09-04
    • US12033411
    • 2008-02-19
    • Yasuo TAKESHITATakuya SUZUKAHyoung Wook CHOI
    • Yasuo TAKESHITATakuya SUZUKAHyoung Wook CHOI
    • H04N5/50
    • H04N5/52H03G3/3052
    • A television reception circuit includes a high-frequency amplifier amplifying a received television signal, a mixer frequency-converting the amplified television signal to an intermediate-frequency signal, a filter attenuating a component outside a prescribed frequency band in the resultant intermediate-frequency signal, a first AGC circuit outputting a first gain control signal for setting a level of the intermediate-frequency signal output from the mixer to a prescribed value, a second AGC circuit outputting a second gain control signal for setting a level of the signal that has passed through the filter to a prescribed value, and a switch selecting any one of the first gain control signal and, the second gain control signal and outputting the selected gain control signal to the high-frequency amplifier, and the high-frequency amplifier amplifies the television signal with gain based on the gain control signal received from the switch.
    • 电视接收电路包括放大接收的电视信号的高频放大器,将放大的电视信号频率转换为中频信号的混频器,对所得到的中频信号中规定的频带以外的分量进行衰减的滤波器, 输出用于将从混频器输出的中频信号的电平设定为规定值的第一增益控制信号的第一AGC电路,输出第二增益控制信号的第二AGC电路,用于设定已经通过的信号电平 所述滤波器达到规定值,以及开关,选择所述第一增益控制信号和所述第二增益控制信号中的任何一个,并将所选择的增益控制信号输出到所述高频放大器,并且所述高频放大器放大所述电视信号 具有基于从开关接收的增益控制信号的增益。