Design Of Multimedia Module In Video Intercom System

With the development of technology, people needs safer and more convenient living environment, residence community are developing toward intelligent. Video intercom system as the standard configuration of intelligent building is taken more seriously. The traditional video intercom system can not meet the current video intercom system for multimedia needs because of the single function. People hope that the new generation of video intercom system could be more function and more intelligent. Based on this situation, make use of the rich function of embedded systems to achieve multimedia of video intercom system.According to the multimedia needs, the modular design was used in the design of multimedia video intercom system. This design achieved multimedia function of video intercom system without changing the traditional original design and function just by adding a multimedia module.The design of Multimedia Module will be described in this article by dividing into two parts, hardware and software. First of all, chose core processor according to the needs of multimedia function in the hardware design. The SDSC536A chip of SUNPLUS Company was chosen because of its comprehensive performance, stability, price factors etc. SDSC536A chip with powerful MPEG / JPEG engine, audio codec, and a wealth of external interface was very suitable for embedded multimedia applications; then the appropriate peripheral chips and devices were selected according to the core processor performance, features and system requirements. Schematic diagram of Microprocessor, communications interface, SDRAM, FLASH, video,audio, SD cards and so on were designed detailedly and discussed. Then design the schematic diagram of multimedia module, layout PCB circuit, make the first test products.For software design,μC / OS-II embedded operating system was chosen according to multimedia functions and hardware requirements. First structure compiling and debugging platform ofμC / OS-II System, thenμC / OS-II system was transplanted into SDSC536A chip. Then overrall program was designed and multimedia functions were realized seriatim. The system was tested strictly, and be corrected and optimized according to test results.After 10 month of design, multimedia module was finished, so that the video intercom system had functions of taking pictures of visitors, video, digital photo frame, MP3, MP4, SD card and so on. The product which was used after rigorous testing had a good market response. The multimedia module which increased functions and practicality of video intercom system promoted the grade of system, increased highlights and competitiveness of the product, would have broad market prospects.