Digital television
AssigneeFunai Electric Co., Ltd.
InventorKazuteru Adachi
Life of this patent
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Abstract
A digital television combination integrated circuit is employed which includes a video signal D/A converter which converts a digital video signal to an analog video signal, and an audio signal D/A converter which converts a digital audio signal to an analog audio signal; there are provided a level shift circuit which extracts a luminance signal in the video signal which is outputted from the video signal D/A converter, and a low pass filter which extracts the DC component of the output signal of this level shift circuit; and the output signal of this low pass filter is supplied as a control voltage signal for gain control of an audio amplification circuit.
Claims2
A digital television, comprising:
- a digital television combination integrated circuit, including a video signal D/A converter which converts a digital video signal to an analog video signal;
- an audio signal processing circuit which performs processing upon an audio signal according to a control voltage;
- a level shift circuit which inputs the video signal outputted from the video signal D/A converter, and eliminates a synchronization signal portion included in the video signal, thus extracting a luminance signal portion;
- and
- a filter circuit which inputs the output signal of the level shift circuit, and, along with extracting a low frequency component of the luminance signal, also outputs the result to the audio signal processing circuit as a control voltage signal.
Dependencies are inferred from the claim text.