| 摘要 |
PURPOSE: A tuning device of a set top box and a tuning method thereof are provided to enable a digital signal searcher to re-search a digital broadcasting signal if an analog broadcasting signal is not searched, thereby continuously receiving a recovered digital broadcasting service without re-selecting a broadcasting channel. CONSTITUTION: A channel tuning unit(401) receives a broadcasting signal from a selected broadcasting channel. A digital signal processor(411) processes a digital broadcasting signal to display the signal on a display. An analog signal processor(413) processes an analog broadcasting signal to display the signal on the display. A digital signal searcher(403) searches whether the digital broadcasting signal is inputted to the channel tuning unit(401). An analog signal searcher(405) searches whether the analog broadcasting signal is inputted. A search signal generator(407) generates a search signal to search the digital broadcasting signal. A controller(409) transmits the searched digital broadcasting signal to the digital signal processor(411), and transmits the analog broadcasting signal to the analog signal processor(413). If the analog broadcasting signal is not searched, the controller(409) controls the digital signal searcher(403) to re-search the digital broadcasting signal.
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