Digital TV set top box for realizing information return based on wireless module
2009
The invention relates to a digital TV set top box for realizing information return based on a wireless module and belongs to the technical field of communication devices. The digital TV set top box consists of a downlink demodulating-decoding subsystem and an uplink return sending subsystem, wherein the downlink demodulating-decoding subsystem comprises a demodulating-decoding chip as well as a peripheral circuit consisting of a tuner, an infrared remote control, a smart card, an audio/video output, an E ROM, an audio/video memory, an FLASH and an SDRAM; and the uplink return sending subsystem comprises a GSM wireless module, an SIM card base and a 232 interface level conversion circuit. Compared with the existing PSTN return, the digital TV set top box does not need to occupy or changeuser lines; compared with the existing IP network return, the digital TV set top box does not need to recreate an IP network; and compared with the existing internal interacting mode, the digital TVset top box does not need to conduct two-way network reformation. The digital TV set top box can obviously lower user cost, and is beneficial to the combination of a cable TV network and wireless communication network service, the expanding of cable TV digitization, the development of value added service, as well as the expanding of a new video-on-demand datacast service.
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