Design scheme of intelligent TV and computer integrated machine based on ANDROID4.X

0 Preface

There are two main methods for realizing the solution of integrated TV and computer in the current market. The first method is to add a digital decoding circuit on the basis of the existing TV circuit, and then add a PC motherboard solution. This type of solution 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 an embedded main control board with poor performance, which realizes the Internet access function of the smart cloud TV, but the chip performance is low, the main control board circuit is simple, and the performance is poor, so the support for PC functions is limited. The normal operation of the PC cannot be achieved, and the cost is relatively high, which makes it difficult to develop later. The third method proposed in this paper is the 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 the touch screen input is used to solve the frustration of fool users who ca n’t use the keyboard, simplifying the user ’s use, is a smart computer TV integrated It is a fool-oriented application of the mobile phone, and supports voice input and output, which can meet the future digital needs of homes, and is an important application of the smart TV cloud-based Internet of Things.

1 Realization method of touch screen TV and computer integrated machine

This solution is to add analog signal receiving and decoding, and digital signal receiving and decoding circuits on the PC motherboard, so that the TV signal can be input to the PC motherboard, so as to realize the intelligent cloud TV function, and connect through the USB3.0 interface on the PC motherboard Into the touch screen, and finally realize the integrated TV and computer with touch function, and supports traditional keyboard and mouse input operations, and also supports microphone input and speaker output. Figure 1 shows the circuit block diagram of a TV and computer integrated machine with touch screen input function.

First of all, this system adds an analog circuit on the PC motherboard to achieve the reception of analog TV signals. The radio frequency analog TV signal is received through the 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 of AV input or the analog video signal of S-VIDEO input is also input to this decoding chip on the motherboard. The function of this analog decoding chip on the motherboard is to convert various analog signals into digital signals after ADC conversion, then digital processing and decoding, and finally output digital signals in the format of ITU656 or ITU601.

Secondly, add digital circuits on the PC motherboard to realize the reception of digital TV signals. It is more complicated for the PC motherboard to receive digital TV signals than to receive analog signals and complete signal modulation and demodulation. The digital circuit of the motherboard receives RF digital TV signals through a tuner (tuner) and completes channel decoding to output a serial TS stream. . Since the digital TV signal is usually an encrypted signal, the TS stream needs to be decrypted. The decrypted TS stream is finally sent to the chipset, and the chipset completes the decoding of the MPEG2 source. After processing operations such as chipset dynamic noise reduction, de-interlacing, format conversion, and image detail enhancement, standard definition and high definition TV signals are converted into LVDS signals in a unified format (such as 1 920 & TImes; 1 080 P / 60 Hz), and Send to the LCD screen to complete the output of the TV signal, so as to realize the TV function. Because the PC motherboard interface is rich, there are more USB interfaces, and supports the latest USB3.0 interface, it can be connected to a touch screen to complete the input operation of the touch function, which can also replace the traditional keyboard and mouse operations. 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 the latest DDR3 memory. Compared with the traditional embedded motherboard, this motherboard has powerful functions, which can not only load the embedded operating system WINCE or LINUX, but also support the latest WIN8 and ANDROID systems. There are 2 SATA ports inside to connect the hard disk and CD-ROM drive, and the remaining USB3.0 ports make it possible to install ANDROID and other systems on the U disk, and the speed of USB3.0 is more than ten times higher than that of USB2.0.

Two built-in PS / 2 interfaces can support traditional keyboard and mouse input.

2 System hardware implementation

2.1 Main device selection for motherboard integration

Due to the good market prospects of touch input TV and computer integrated machines, many IT manufacturers (such as Lenovo) are entering the field of home appliances from the traditional IT field, and many home appliance companies such as Haier are also striving to enter the IT field. Therefore, the integration of computer and TV touch screens Machine products have become an important competition place for major giants. Intel, AMD and VIA are not far behind, and have successively launched high-integration, low-power CPUs and chipsets suitable for embedded applications, and some even integrate CPUs (above 1 GHz), Southbridge, Northbridge and other interfaces in together. This motherboard integrates 1.2 GHz VIA QuadCore-E quad-core E series processor or 1.0 GHz VIA Eden X2 processor and the latest VIA VX11H media system chipset to provide excellent computing performance for miniaturized systems. This series belongs to the X86 system and can run WINDOWS8 and ANDROID4.X embedded operating systems. It can be seen from the system block diagram that the digital high-definition TV tuner and channel decoding circuit and the analog signal tuner and standard-definition signal decoding circuit are added on the basis of the PC motherboard to complete the reception function of analog TV and digital TV , And connect to the touch screen through the USB3.0 interface to achieve touch input instead of traditional keyboard and mouse input. Complete the input and output of voice through the voice input and output port of the PC motherboard to achieve standard human-machine communication. Using the latest VIA EPIA-M920Mini-ITX motherboard not only saves research and development costs, reduces the volume of the all-in-one, but also reduces power and heat.

2.2 CPU selection on PC motherboard

VIA QuadCore E series processors integrate 4 high-performance 64-bit cores to provide low power consumption, high-performance multitasking and excellent multimedia performance for embedded TV and computer all-in-ones. The latest quad-core 64-bit processor allows TV and computer integration The machine runs faster. The VIA QuadCore E series processors use a low-power, high-performance multi-core architecture that provides excellent multi-thread support, enabling low-power multi-task execution, multimedia playback, high computing power, and Internet browsing.

The VIA QuadCore E series processors support distributed processing, making it easy to implement applications in various multi-screen display environments. The VIA QuadCore E series processors support 64-bit operating systems, and also have adaptive overclocking, with a series of performance such as 4 MB L2 cache and 1 066 MHz V4 bus. Its low-power design is in a leading position in the industry, such as the VIA QuadCore E series processor (ultra-low-power version) with a main frequency of 1.0+ GHz. The thermal design power consumption is only 18 W in a fanless configuration. In addition, VIA QuadCore E series processors also support virtualization technology, which can run related software and applications in a virtual environment without affecting their performance. The VIA QuadCore E series processors use the VIA PadLock advanced decoding engine to provide the world's fastest AES encryption and implement hardware-based encryption of operational data, which is an important tool for content protection of operational data and system security. VIA QuadCore E series processors provide three models with main frequencies of 1.0+ GHz, 1.2+ GHz, and 1.46+ GHz. It is produced using the latest 40 nm process technology, 21 mm & TImes; 21 mm VIA NanoBGA2 package, and its core size Only 11 mm & TImes; 6 mm, fully pin compatible with VIA C7, VIA Eden, VIA Nano X2 processor series and VIA Eden E processor.

2.3 Main board and chipset selection

The VIA EPIA-M920 Mini-ITX motherboard is based on the industry-standard Mini-ITX form factor, with a size of 17 cm & TImes; 17 cm. The rear panel I / O includes 2 Gigabit Ethernet ports (optional) and 2 USB 3.0 ports , 2 HDMI interfaces, 1 VGA interface, 1 COM interface, 2 USB 2.0 interfaces and audio input, output jacks and microphone jack. Onboard headers include 2 LVDS, 1 USB 3.0 interface and additional 4 USB 2.0 interfaces, 2 SATA interfaces, 3 RS232 interfaces support 5 V / 12 V voltage, digital I / O, LPC, 1 SD Card (SDHC / SDXC) and 1 PCIe x4 card slot. The motherboard can support up to 16 GB, 1 333 MHz DDR3 memory, in addition, also provides ATX or DC power supply support.

The VIA VX11H media system chipset supports DirectX11 and 3D stereo display. It uses the latest VIA Chromotion 5.0 video processor to provide high-performance hardware HD video decoding. The VIA Chromotion 5.0 video processor provides hardware acceleration for the latest MPEG-2, MPEG-4, VC1, WMV9 and high-definition H.264 video format content at 1 080 p HD resolution, providing users with an extremely rich entertainment experience.

  Class 200 heavy insulation thickness of Polyester-imine / polyamide-imide compound enameled aluminum round wire

EI/ AIW Enameled Aluminium Wire

Enameled Aluminum Wire,Ei/ Aiw Enameled Aluminium Wire,Round Winding Wire,Super Enameled Aluminum Round Wire

HENAN HUAYANG ELECTRICAL TECHNOLOGY GROUP CO.,LTD , https://www.huaonwire.com