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Diversity system null for load television

机译:负载电视的分集系统无效

摘要

PURPOSE:To improve the VHF reception function and to cope with disturbance of a picture due to movement by providing a VHF exclusive booster circuit and a boost switching circuit controlling the booster circuit. CONSTITUTION:A level of antennas 1-4 latched by latch circuits 2a -2d is compared with a maximum value level of a maximum detection circuit 4 and the result of comparison is inputted to an antenna changeover circuit 6. Then the antenna with a maximum level for 1H is supported. The selected antenna signal passes through a filter 7a and is separated into UHF and VHF signals. The separated signal is boosted by a UHF booster 8b and a VHF booster 8a, and mixed by a filter 7b and outputted to a TV tuner 1. The booster 8a is controlled by a boost changeover circuit 9 receiving an RF AGC signal and brought into the through-state.
机译:目的:通过提供VHF专用升压电路和控制升压电路的升压开关电路,改善VHF接收功能并应对由于运动而引起的图像干扰。组成:将由锁存电路2a -2d锁存的天线1-4的电平与最大检测电路4的最大值电平进行比较,并将比较结果输入到天线转换电路6。然后,将具有最大电平的天线支持1H。所选择的天线信号通过滤波器7a,并且被分离为UHF和VHF信号。分离的信号由UHF升压器8b和VHF升压器8a升压,并由滤波器7b混合并输出到电视调谐器1。升压器8a由接收RF AGC信号的升压转换电路9控制并进入直通状态。

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