Combined digital set top boxes based on software radio

Abstract

Disclosed is a composite set-top box based on software defined radio in the digital television field. A function unit comprises a satellite television signal turner, a cable television signal turner, a ground radiated television signal turner, an A / D transformer, a digital down converter, a software defined radio platform, a MPED-2 main chip system, an analog audio-video processing unit, an embedded control circuit, operating keys and a display panel; wherein the software defined radio system composed of a high-performance DSP completes the demodulation of QAM, QPSK and COFDM three modulation signals; an embedded control circuit is used as the main control unit of the whole television; connects and controls the satellite television signal turner, the cable television signal turner and the ground radiated digital television signal turner, the MPEG-2 main chip system and the software defined radio platform through an I<2>C bus and HPI host interfaces; and connects with the operating keys and the display panel through a GPIO interface. The invention achieves the function that the single set-top box simultaneously receives the satellite signals, the cable television signals and the ground radiated digital television signals.

Description

Technical field [0001] The invention relates to a receiving device in the field of digital television, in particular to a composite digital set-top box based on software radio. technical background [0002] A digital set-top box is a device that can provide analog audio and video interfaces so that the existing analog TV can receive and watch digital TV programs normally. The digital set-top box is the main equipment for fully exerting and maintaining the use value of analog TV during the transition period from analog TV broadcasting to digital TV broadcasting. Therefore, in the trial and exploration process from analog TV broadcasting to digital TV broadcasting, digital set-top boxes will play an important role and have a very huge market prospect. [0003] At present, the main transmission methods of digital TV programs can be divided into cable broadcasting, terrestrial broadcasting and satellite broadcasting. Generally speaking, digital cable television broadcasts are mainly ...

AI Technical Summary

Problems solved by technology

However, most of the set-top box technologies disclosed in existing patent documents and the digital set-top boxes currently developed, produced and sold are too single in function, and are difficult to adapt to the current development of digital TV broadcasting and the needs of people to receive various digital TV program broadcasts.

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