| 摘要 |
An NTSC tuner, an ISDB tuner, a CATV tuner, and a CATV modulator are connected to an analog switch box. Demodulation sections, an A/D, clock-reproducing section, and a modulation section are connected between the analog switch box a bus. MPEG2 video decoder sections, an MPEG2 audio decoder sections, an NTSC/EDTV horizontal decoder section, an EDTV vertical decoder section, an MPEG2 video encoder section, and an MPEG2 audio encoder section are connected between the bus and a bus. An audio amplifier, a graphics controller, and A/D conversion sections are connected the bus. The switch box and the buses are connected to a bus controller, which is connected to a CPU, a memory, and a remote-control I/F. These modules are selectively used to receive and process digital broadcasting signals, digital CATV signals or NTSC broadcasting signals. Even while the CPU is performing bootstrap processing immediately after the power switch of the television receiver is turned on, a DMA device is initialized, causing a monitor to display an image being received, no matter whether an operating system has been activated or not.
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