Five-in-one tuner for television signals

Abstract

The invention discloses a five-in-one tuner for television signals. The five-in-one tuner comprises a radio frequency preprocessing module A, a down-conversion module, a digital video broadcasting-terrestrial / cable (DVB-T / C) / Asia television (ATV) demodulation module, a radio frequency preprocessing module B, a zero intermediate frequency processing module, a DVB-satellite / satellite-second generation (S / S2) demodulation module and a decoding module, wherein the radio frequency preprocessing module A is used for performing filtering and inter-level impedance matching on DVB-T / C and ATV signals; the down-conversion module is used for converting the DVT-T / C and ATV signals into low intermediate frequency signals; the DVT-T / C / ATV demodulation module is used for demodulating the low intermediate frequency signals, and outputting audio and video signals or a serial / parallel data stream; the radio frequency preprocessing module B is used for performing filtering and high frequency amplification on DVB-S / S2 signals; the zero intermediate frequency processing module is used for performing frequency conversion on the DVB-S / S2 signals to obtain I / Q signals; the DVB-S / S2 demodulation module is used for demodulating the I / Q signals; and the decoding module is used for decoding the data stream. The five-in-one tuner can realize the compatible demodulation and decoding output of DVB-T, DVB-C, ATV, DVB-S and DVB-S2 television signals.

Description

technical field [0001] The invention relates to an electronic tuner, in particular to a five-in-one tuner which is compatible with DVB-T, DVB-C and ATV TV signal low-intermediate frequency output, and also includes DVB-S and DVB-S2 TV signal demodulation . Background technique [0002] The emergence of digital TV programs makes the TV receiving system must have the ability to receive analog signals and multi-standard digital signals at the same time. The existing TV signals include DVB-T, DVB-C, ATV, DVB-S and DVB-S2, where DVB-T is a terrestrial digital TV signal, DVB-C is a cable digital TV signal, and ATV is an analog TV signal , DVB-S is a standard-definition digital satellite TV signal, and DVB-S2 is a high-definition digital satellite TV signal. The basic receiving function of the TV receiving system is to receive analog TV signals and digital TV signals, among which the working frequency for receiving DVB-T, DVB-C and ATV is: 45MHz-860MHz, and the working frequency ...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, the RF part of digital TV reception and analog TV reception in the 45MHz-860MHz segment is difficult to take into account DVB-T, DVB-C and ATV because of the indicators, usually two tuners are used to process them separately, and two intermediate frequencies are required. At the same time, the original tuner circuit is complex, difficult to debug, and large in size; digital TV signals in the 950MHz-2150MHz segment also need another tuner to process

This increases the design difficulty of the TV set and makes it difficult to carry out thin and light design

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