| 摘要 |
An apparatus for automatically selecting an audio signal of a digital television including: an amplifier for selectively receiving a digital audio signal among signals that are being outputted from at least two audio sources and amplifying it to a predetermined level; an integrating unit for detecting the level of the amplified signal and integrating it; and a controller for selecting a digital audio signal upon judgement that there is a digital audio signal if the integrated signal level is above a certain level, and outputting a control signal to select an analog audio signal upon judgement that there is no digital audio signal if the integrated signal level is below a certain level. With this construction, upon judgement whether there is a digital audio signal, if there is a signal, the digital audio signal is automatically received from a corresponding source, while, if there is no signal, an audio signal is received from other source, and whatever received is externally transmitted through an amplifier, thereby providing users with convenience in use.
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