| 摘要 |
An integrated control system of an electronic teaching desk, an audio signal amplifying device, and an operating method thereof are provided to prevent damage to each device by supplying or blocking the operational power in a predetermined sequence. An audio signal amplification device of an electronic teaching desk includes an amplifier(100), a controller(50), a display unit(40), and a keyboard(70). The amplifier inputs an audio signal higher than the designated reference level. The amplifier amplifies the signal to one state of the high output and low output. The amplifier generates an alarm signal by detecting one or more one among the opening state and the short-circuit state of the output terminal and the heating state above a predetermined value. The controller is connected to the amplifier and controls the amplifier to operate in one of the high output amplification, the low output amplification, and the amplification interruption by the alarm signal inputted by selecting a standby mode by the inputted command signal. The display unit displays the selected one of the high output amplification, the low output amplification, and the amplification interruption state by the control of a controller. The keyboard inputs the standby mode section signal of the amplifier and the command signal to select the output state. |
