| 摘要 |
PURPOSE: A device for selecting input signal of a digital TV is provided to search signals from several audio sources. Therefore, the device selects corresponding audio source automatically. CONSTITUTION: The device for selecting input signal of a digital TV comprises an audio signal inputting part(101), an amplifying part(102), an integrating part(103), and a controlling part(104). The audio signal inputting part(101) inputs audio signal from several sources. The amplifying part(102) amplifies the audio signal inputted from the sources to prescribed level. The integrating part(103) integrates the signal amplified to prescribed level in the amplifying part(102). The controlling part(104) generates control signal which selects the sources according to result of integration of the integrating part(103). The amplifying part(102) is a schmidt triggering amplifying part having a schmidt trigger specification The integrating part(103) comprises a diode(D), a resistance(R), and a capacitor(C).
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