Android smart TV box internal illustration
Everyone has seen so many set-top boxes on the sofa forum. What is inside a set-top box? , Xiaobian did not know the true colors of the original. However, today through the orange TV development prototype, Xiao Bian has finally been ignorant - "We are doing out of the box, are opening something" ~
The first is the overall picture inside the box. The three outstretched lines on the main circuit board are the set-top box smart switch, infrared receiver and external antenna. Can you distinguish them?
The black and red line is the power switch. Some set-top boxes do not have switch buttons, but most of them still retain this design.
This product is an antenna;
This product is an antenna;
This cargo is an antenna; (Important things say three times)
Network set-top boxes, whether external or built-in, are actually equipped with antennas. Since we are generally used at home, the signal is basically similar to the built-in and external. The key is the workmanship. If the workmanship is meticulous, there will be no problems with the built-in and external devices. Therefore, it is better to buy the set-top boxes of well-known brands.
This infrared receiver looks like it is not easy to distinguish...
Below the black heatsink is the most important CPU in the smart set-top box. After dismantling, you can generally find that the heat sink is basically three colors - gold, silver or black.
After the housing is removed, the interface of the smart set-top box is firmly fixed by welding.
Front view, AV interface, USB interface is clearly visible.
From the perspective of signal processing and application operations, STB includes the following layers:
(1) Physical layer and connection layer: Includes high-frequency tuner, QPSK, QAM, OFDM, VSB demodulation, convolutional decoding, deinterleaving, Reed-Solomon decoding, and solution of energy diffusion.
(2) Transport layer: includes demultiplexing, which divides the transport stream into video, audio, and data packets.
(3) Program layer: Includes MPEG-2 video decoding. MPEG/AC-3 audio decoding.
(4) User layer: Including service information, electronic program table, graphical user interface (GUI), browser, remote control, conditional access, data decoding.
(5) Output interface: including sub-analog video and audio interfaces, digital video and audio interfaces, data interfaces, keyboards, and mouse.
The welding process of intelligent hardware is very important, it determines the service life of hardware as a system.
Main circuit board back detail.
With the development of digital television and network technology, the function of digital TV set-top boxes will be more complete and external interfaces will be more abundant. It can be connected to a digital camera through a USB interface, and can be attached to a hard disk for storage of programs via the IDE interface. It is no doubt that interactive set-top boxes have become the mainstream of digital TV set-top boxes. Users can not only watch digital TVs on analog TVs, but also realize a series of functions such as entertainment and Internet access. Smart set-top boxes can be said to have contributed.
The living room culture of the future is condensed in this small box!
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