| 摘要 |
PURPOSE: A complex medium processing system is provided to watch digital CATV broadcasting and perform data communication such as the Internet through TV. CONSTITUTION: The first signal processing device includes a QAM(Quadrature Amplitude Modulation) demodulating/FEC(Forward Error Correction) processing unit, a transport demultiplexer and decryption unit(34), and an MPEG(Moving Picture Expert Group) video decoder(35). The first signal processing device separates demodulated video/audio data in response to a digital signal inputted through a wire, and decompresses video compression data. The second signal processing device processes a data communication signal, and provides graphics data. A graphics processor and video overlay(38) selects data from the first and second signal processing devices, and generates the first or second analog signal. The graphics processor and video overlay(38) blends the output signals of the first and second signal processing devices at a selected blending rate, and generates the third analog signal. A video encoder(39) converts the first, second or third analog signal from the graphics processor and video overlay(38) into a signal suitable for display. A PLD(Programmable Logic Device)(33) controls the blending rate of the graphics processor and video overlay(38).
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