Television capable of supporting multiple digital television standards

Abstract

The invention provides a television capable of supporting multiple digital television standards, wherein a central processing device transmits a passage selection signal and channel selection signals according to a current working state of the television; a first receiving device receives RF (Radio Frequency) signals of a first standard, and obtains an RF signal of a corresponding channel in the RF signals of the first standard according to a first channel selection signal and converts the RF signal into a first intermediate frequency signal; a first demodulation device demodulates the first intermediate frequency signal into a first transport stream signal; a second receiving device receives RF signals of a second standard, and obtains an RF signal of a corresponding channel in the RF signals of the second standard according to a second channel selection signal and converts the RF signal into a second intermediate frequency signal; a second demodulation device demodulates the second intermediate frequency signal into a second transport stream signal; a first switching device receives the transport stream signals according to the passage selection signal; a decoding device receives and decodes the transport stream signals and then outputs the decoded signals; a display device receives and displays the decoded signal; and an image treatment device connected between the decoding device and the display device is used for performing image enhancement treatment or scaling treatment to the decoding signals.

Description

technical field [0001] The invention relates to a digital TV receiving technology, in particular to a TV supporting multiple digital TV systems. Background technique [0002] At present, the technology capable of supporting the reception of one of the DVB-T, DVB-C or DVB-S standard TVs has matured, and the receiver for receiving the DVB-S2 standard is also being developed and perfected. [0003] In order to be able to receive television signals of multiple formats, the following solutions exist in the prior art: [0004] 1. Realize by using an analog TV plus corresponding DVB-T, DVB-C and DVB-S / S2 set-top boxes. [0005] 2. It is realized through the iDTV TV receiver with built-in DVB-T, plus DVB-C and DVB-S / S2 set-top boxes. [0006] 3. On the basis of the original iDTV with built-in DVB-T, plus the corresponding receiving module made of DVB-C and DVB-S / S2 set-top box chips, Combo's multi-standard digital TV receiver is composed. [0007] However, the above solutions hav...

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Problems solved by technology

During the processing of these two kinds of signals, there will be mixing and separation of different color signals, which will inevitably cause the loss of each color signal and mutual interference; and if the source signal is a video signal in high-definition format, the After reducing the signal to SD signal (the video formats of CVBS and S-Video cannot support HD signal), the SD signal cannot be restored to HD content on the TV side

[0011] The video of the set-top box can also be output in the video color difference signal (YPbPr / YCbCr) format, although this can avoid the inevitable signal loss caused by the working principle of the above two signal formats, but to output the color difference signal in high-definition format, It will greatly increase the cost of the set-top box, and the YPbPr signal is still an analog signal in essence, and it will inevitably introduce noise during the transmission process and reduce the image quality

[0012] Some high-end set-top boxes can provide high-definition signals in digital format (High Definition Multimedia Interface, referred to as HDMI), although this can avoid introducing noise during transmission, but because the front-end set-top box must first scale the source signal to the resolution set by HDMI The signal, and then the TV scales the resolution signal set by HDMI to the resolution signal of the display screen. Such two scaling processes will introduce a certain degree of geometric distortion of the image.

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