Ground digital television set-top box

The utility model provides a ground digital television set-top box, which comprises a central processing unit, as well as an information channel demodulation unit, an information source decoding unit, a display control module and the like, which are connected with the central processing unit through an internal bus; a scrambling-descrambling unit comprises a smart card reader connected with a smart card interface; the display control module comprises an LED display panel, a button and an infrared remote controller; the information channel demodulation unit comprises a receiving tuner and a demodulation module, and can choose various demodulation manners flexibly; the information channel demodulation unit accesses the information source decoding unit through a multi-way data stream processing unit; the information source decoding unit is divided into an audio decoder and a video decoder, demodulates main picture images and teletext data at the same, automatically adapts to different code manners and rightly restores to original sound and video data for outputting through different output interfaces; and the central processing unit adopts an embedded CPU integrated with a floating point operation unit, and is connected with a high-speed internal memory. The set-top box is also provided with an Ethernet interface, an RS232 interface, a USB interface, a PCI (Programmable Communications Interface) and an expansion interface, realizes multi-channel receiving and has a strong error correction function.