| 摘要 |
PURPOSE: A universal receiver is provided to receive both ground wave and satellite broadcasting signal with a single input/output port, thereby realizing a simple hardware structure and decreasing manufacturing costs. CONSTITUTION: If a power switch is turned on, a micro control unit(MCU) supplies power to an analog processor, a digital processor, and an output circuit, and initializes a CPU(S1,S2). The CPU initializes the analog/the digital processors according to a control sequence of an execution program built in a program ROM(S3). The CPU refers to previous state information stored in an electrically erasable and programmable ROM(EEPROM) to control an output switch, and makes a cathode ray tube(CRT) display a previous power-on state channel(S4). The CPU supplies data for being displayed on a light emitting diode(LED) to the MCU. The MCU supplies the data to the LED to make the LED display a present mode state or channel information, and stands by until a user command is inputted(S5). If the user command is inputted, the command is supplied to the CPU by the MCU(S6). If the command is decided as a mode conversion command, the CPU controls the output switch to convert a present mode into a required mode(S7,S8). If the user command is a command except for the mode conversion command, the CPU maintains the present mode(S9). The CPU controls each unit to convert a channel according to the corresponding user command, and displays the converted channel or controls the volume(S10).
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