0 Preface There are two main methods for implementing a TV-integrated computer solution on the market today: the first method is to add a digital decoding circuit to the existing TV circuit, and then add a PC motherboard solution. This kind of scheme has been widely adopted in the past few years. It is mainly a simple combination of TV and computer, with low integration and high cost. The second is a dedicated single-chip solution, which is currently the mainstream method of smart cloud TV. It mainly uses the embedded main control board with poor performance, thus realizing the Internet access function of the intelligent cloud TV, but the performance of the chip is low, the main control board circuit is simple, and the performance is poor, so the support for the PC function is limited, and the completion is completed. The normal operation of the PC is not possible, and the cost is high, and the later development is difficult. The third method proposed in this paper is a smart TV computer integration solution, which is solved by transforming the traditional PC motherboard. Because the PC motherboard has powerful functions, high performance, and flexible functions, it is easy to access the touch screen through the USB interface, and solve the distress of the fool user not using the keyboard through the touch screen input, simplifying the user's use, is a smart computer TV integration The fool's application of the machine, and support voice input and output, can meet the future digital needs of the home, the important application of the intelligent TV clouded Internet of Things. 1 touch screen TV computer integrated machine implementation method This solution is to add analog signal receiving and decoding on the PC motherboard, as well as digital signal receiving and decoding circuits, so that the TV signal can be input into the PC motherboard to realize the intelligent cloud TV function, and connected through the USB3.0 interface on the PC motherboard. Into the touch screen, the ultimate realization of the touch-enabled TV computer integrated machine, and support the traditional keyboard and mouse input operation, but also supports microphone input and speaker output. Figure 1 shows the circuit block diagram of a TV-integrated computer with touch screen input. First, the system adds an analog circuit to the PC motherboard for receiving analog TV signals. The RF analog TV signal is received by an integrated tuner (high frequency head), and the video signal is output after demodulation, and then sent to the analog decoding chip on the motherboard. At the same time, the analog video signal input by the AV or the analog video signal input by the S-VIDEO is also input to the decoding chip on the main board. The function of this analog decoder chip on the main board is to convert various analog signals into digital signals through ADC, then digitally process and decode them, and finally output digital signals of ITU656 or ITU601. Second, digital circuits are added to the PC motherboard to enable digital TV signal reception. It is more complicated to let the PC motherboard receive the digital TV signal than to receive the analog signal and complete the signal modulation and demodulation. The digital circuit of the motherboard receives the RF digital TV signal through the tuner (tuner) and completes the channel decoding to output the serial TS stream. . Since the digital television signal is usually an encrypted signal, it is necessary to decrypt the TS stream. The decrypted TS stream is finally sent to the chipset, whereby the chipset completes the MPEG2 source decoding. After the chipset dynamic noise reduction, deinterlacing processing, format conversion, image detail enhancement and other processing operations, the SD and HD TV signals are converted into LVDS signals in a uniform format (eg 1 920 & TImes; 1 080 P/60 Hz), and It is sent to the LCD display to complete the output of the TV signal to realize the TV function. Due to the rich interface of the PC motherboard, the USB interface is more, and the latest USB3.0 interface is supported, the touch screen can be externally connected to complete the input operation of the touch function, which can also replace the traditional keyboard and mouse operation. In addition, this motherboard also has an audio input and output interface, which can complete the input and output of sound. This motherboard also supports the current quad-core VIA processor and supports the latest DDR3 memory. Compared with traditional embedded motherboards, this motherboard is powerful enough to load not only the embedded operating system WINCE or LINUX, but also the latest WIN8 and ANDROID systems. The internal SATA interface can be connected to the hard disk and optical drive, and the remaining USB3.0 interface makes it possible to install the ANDROID system on the USB disk, and the speed of USB3.0 is more than ten times faster than USB2.0. Two built-in PS/2 connectors support traditional keyboard and mouse input. 2 system hardware implementation 2.1 Main device options for motherboard integration Due to the good market prospects of touch-input TV PCs, many IT vendors (such as Lenovo) are entering the field of home appliances from the traditional IT field. Many home appliance companies such as Haier also strive to enter the IT field, so the combination of computer TV touch screens Machine products have become an important competitive place for all major players. Intel, AMD, and VIA are unwilling to lag behind, launching highly integrated, low-power CPUs and chipsets for embedded applications, and even integrating CPUs (above 1 GHz), South Bridge, North Bridge, and other interfaces. together. The board integrates the 1.2 GHz VIA QuadCore-E quad-core E-series processor or the 1.0 GHz VIA Eden X2 processor with the latest VIA VX11H media system chipset to deliver outstanding computing performance for miniaturized systems. The series is part of the X86 architecture and runs the WINDOWS8 and ANDROID4.X embedded operating systems. It can be seen from the system block diagram that the digital HDTV tuner and channel decoding part circuit and the decoding circuit of the analog signal tuner and SD signal are added on the basis of the PC motherboard, thereby completing the receiving function of the analog TV and the digital TV. And through the USB3.0 interface to connect the touch screen, the touch input replaces the traditional keyboard and mouse input. Through the voice input and output port of the PC motherboard, the voice input and output is completed, and standard human-machine communication is realized. Using the latest VIA EPIA-M920Mini-ITX motherboard not only saves development costs, reduces the size of the all-in-one, but also reduces power and heat. 2.2 CPU selection on the PC motherboard The VIA QuadCore E-Series processor integrates four high-performance 64-bit cores to deliver low-power, high-performance multitasking and outstanding multimedia performance for embedded TV PCs. The quad-core 64-bit latest processor allows TV PCs to be integrated The machine runs faster. The VIA QuadCore E-series processors feature low-power, high-performance multi-core architectures that deliver outstanding multi-threading support for low-power multitasking, multimedia playback, high computing power, and Internet browsing. The VIA QuadCore E-series processors support distributed processing and are easy to implement in a variety of multi-display environments. The VIA QuadCore E-series processors support 64-bit operating systems and feature adaptive overclocking with a 4 MB L2 cache and a 1 066 MHz V4 bus. Its low-power design is leading the industry, such as the 1.0+ GHz VIA QuadCore E-series processor (Ultra Low Power Edition) thermal design power running at 18 W in a fanless configuration. The VIA QuadCore E-Series processors also support virtualization technology that runs related software and applications in a virtual environment with no impact on performance. The VIA QuadCore E-series processor uses the VIA PadLock advanced decoding engine to deliver the world's fastest AES encryption and hardware-based operational data encryption, making it an important tool for content protection and system security for operational data. The VIA QuadCore E-Series processors are available in 1.0+ GHz, 1.2+ GHz, and 1.46+ GHz versions. They are manufactured in the latest 40 nm process, 21 mm & TImes; 21 mm VIA NanoBGA2 package with core dimensions Only 11 mm & TImes; 6 mm, fully pin compatible with the VIA C7, VIA Eden, VIA Nano X2 processor series and VIA Eden E processors. 2.3 All-in-one motherboard and chipset selection The VIA EPIA-M920 Mini-ITX motherboard is based on the industry-standard Mini-ITX form factor and measures 17 cm & TImes; 17 cm. The rear panel I/O includes 2 Gigabit Ethernet interfaces (optional) and 2 USB 3.0 interfaces 2 HDMI ports, 1 VGA port, 1 COM port, 2 USB 2.0 ports, audio input and output jacks and microphone jack. Onboard pin header includes 2 LVDS, 1 USB 3.0 interface and 4 additional USB 2.0 ports, 2 SATA ports, 3 RS232 ports for 5 V/12 V, digital I/O, LPC, 1 SD Card (SDHC/SDXC) and 1 PCIe x4 card slot. The board supports up to 16 GB, 1 333 MHz DDR3 memory, and ATX or DC power support. The VIA VX11H media system chipset supports DirectX11 and 3D stereo display, which uses the latest VIA Chromotion 5.0 video processor to provide high-performance hardware HD video decoding. The VIA Chromotion 5.0 video processor delivers hardware acceleration for the latest MPEG-2, MPEG-4, VC1, WMV9 and HD H.264 video formats at 1 080p HD resolution, providing users with an extremely rich entertainment experience.
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