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七、操作显示面板操作显示面板由键盘矩阵及扫描电路、显示电路、红外线遥控接收器等组成。用户通过操作面板按键或遥控,实现人机对话功能。显示电路主要通过数码显示器来显示当前节目的频道号或其他一些设备参数的显示。八、开关稳压电源有线电视数字机顶盒的电源主要采用脉宽调制式开关稳压电源。开关稳压电源的组成原理方框图如
Seven, the operation of the display panel The operation of the display panel consists of keyboard matrix and scanning circuit, display circuit, infrared remote control receiver and other components. Users through the control panel keys or remote control, to achieve human-machine dialogue. The display circuit mainly displays the channel number of the current program or other device parameters through the digital display. Eight, switching power supply Digital TV set-top box power supply mainly uses PWM switching power supply. Switching power supply components of the principle block diagram