基于单片机的电子音乐门铃外文参考.doc

Visual Round wireless doorbell in the voice communications system design and implementation First:Introduction Microelectronics technology, wireless technology and network technology for the development of modern people living environment of security, facilitate the provision of a strong technical support，This presents a smart area for the safety of the new wireless doorbell system visualization Round, On the systems overall structure and working principle and the key technology full-duplex digital voice communications for the design and realization of，Analysis of the digital transmission of voice processing, a frame structure on the design and realization of the CPLD in a wireless doorbell system visualization Round-frame synchronization . Finally, the prototype system by the field test, stable performance, reliable, clear voice, has good practical value. The development of electronic, wireless and network technology provides the strong technical support for security and convenience of modern residential quarters. In this paper, we introduce a new style wireless visual inter-conversation doorbell system, which is used in the intelligent residential quarters. Then explains the structure of this system, and it’s full-duplex digital voice communication is designed and implemented. We emphasize the digital voice process in transmission, and discuss the design of the structure of frame, and the frame synchronization realized in CPLD. Finally, the test result shows a stable and reliable quality, clear voice and fairly practical value. Second:Features At present domestic doorbell has been a lot of visualization products, mainstream product is wired, one-way voice and Simulation. Visual Round wireless doorbell system combines computer technology, wireless communications and digital signal processing technology used in high-frequency wireless transmitter receiver, installation without cabling, would not undermine the effectiveness decoration. Visual Round wireless doorbell