Modern families have shifted from the pursuit of home luxury decoration to home intelligence, enjoying the diversified information brought by intelligence, as well as the safe, comfortable and convenient living environment. Especially the development of the Internet of Things and 3G mobile technology, intelligent life allows you to truly realize that you are always at home.
The smart home system is a high-efficiency, comfortable, safe, convenient and environmentally-friendly home living environment that uses computers, embedded systems and communication network technologies to provide automation, information and intelligence in a home-based platform. At present, the intelligence of smart home life depends on the efficiency and reliability of information transmission, mainly wired transmission and wireless transmission. Wired transmission has the disadvantages of complicated wiring, poor scalability, inconsistent standards, and difficult construction. It is difficult to obtain a large market space. Radio frequency technology is a short-range, low-complexity, low-data-rate, low-cost wireless communication technology. It requires no rewiring and uses point-to-point RF technology to control the lighting and other equipment of home appliances. The control method is simple and has been widely used in smart homes in recent years. Therefore, the intelligent transmission of information based on wireless radio frequency technology is the focus of current smart home research, and it will provide people with efficient, comfortable, safe and convenient living environment.
First, the system architecture
The smart home system based on wireless radio frequency technology mainly includes a home gateway and several communication sub-nodes. A wireless transceiver module is configured at the home gateway and each wireless communication sub-node, and data and control information are transmitted between the gateway and each child node to realize mutual information flow sharing. The wireless communication sub-node mainly comprises a smart remote controller , a smart sub-controller, and a smart switch.
The home intelligent gateway is the core of the system. It uses a 32-bit reduced instruction set computer ARM processor to build an embedded Linux operating system platform for state setting and query through a keyboard or touch screen liquid crystal display. The intelligent gateway is connected to the Internet and the PSTN, and can convert the received control commands (including local remote command, remote telephone voice command, remote mobile phone command, remote computer command, etc.) into a wireless RF signal, and pass the RF transmission module. Launched to achieve intelligent home control.
The intelligent remote controller communicates with the home gateway through the wireless interface on the one hand, and has an infrared self-learning function on the other hand, which can decode, learn, and store the infrared code values ​​emitted by different infrared remote controllers, and realize multiple infrared remote controllers. One. The buttons on the LCD screen of the smart gateway and the keyboard of the smart remote controller correspond one-to-one in position. The user defines different key descriptions on the buttons of the smart remote controller, and binds the infrared codes with different control functions. The intelligent remote controller sends the learned infrared signal code value to the infrared intelligent control center or the infrared sub-control center through the wireless transmitting module to realize the registration of the infrared code value on the intelligent sub-controller. When entering the smart home control interface on the smart gateway, when pressing the control button of an electrical device, the code value is transmitted through the wireless transmitting module for RF signal transmission; the intelligent sequencer will receive the wireless code value in the established list. The comparison is performed, and the infrared signal is transmitted and transmitted to realize the control of the household electrical appliance. The smart switch can receive the code value of the wireless signal transmitted by the smart gateway or the smart remote controller, and realize the switching action of the household electrical appliance.
Second, characteristics and advantages
With the continuous improvement of the digital community, the maturity of 3G technology and the continuous development of the security market, digital smart home systems have gradually become the mainstream of building intercom systems. Xiamen Lilin Technology has worked hard to cooperate with many well-known universities to systematically integrate cutting-edge technologies such as Internet, multimedia, RF carrier, security, surveillance, detection and sensing, biometrics, etc., and adopt a universal and perfect communication protocol to ensure the system's Transmission capacity and reliability, build a smart home platform that integrates multiple systems. In particular, based on wireless radio frequency technology to build a smart home system, with 3G technology and Internet technology, to achieve remote control functions, greatly improving people's lives.
(1) Optimizing the H.264 codec algorithm
The key to digital smart home systems based on radio frequency technology is how to implement remote control functions with 3G technology and Internet technology, especially how to improve the quality of remote video transmission. Aiming at this problem, this paper focuses on the H.264 codec algorithm, improves the most time-consuming motion estimation module in H.264 encoding process, reduces the computational complexity of H.264 codec, and effectively improves the H.264 encoding. The decoding efficiency ensures better video transmission in the case of low bandwidth.
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