Design And Implementation Of Wireless Recording System Based On The ATmega16

With the wide spread of computers and multimedia technology, Multimedia teaching has been in the increasing popularity from colleges to middle schools, Apart from schools, The meeting also introduced the technology, with the help of multimedia technology, on the basis of the traditional text documents, the meeting added to the intuitive picture and data reporting, making the meeting colorful, easy to understand.The classroom teaching or meeting may be recorded, some important content even be recording. Besides, the film and television program production also need to be recording. Nowadays the ordinary voice recorder can only hand-held recording, but the audience usually far from the lecturer, the background noise volume is too high in the recorded sound, so it is difficult to achieve a satisfactory effect.This thesis is to design a small-size, low-cost, low-power, no-distortion, easy-to-use wireless recording system to meet the purposes of classroom recording, but also can be used in conferencing systems and television program production, so it has a very broad development prospect in the future.This thesis make depth study on the wireless microphone which is widespread used in the above occasions, make the system automatically lock and stability receive the signal of the major wireless microphone on the market. The system has a strong commonality, which greatly reduce the costs.On the hardware the system choose the Atemel company’s AVR series microcontroller ATmega16as the CPU, choose the PHILIPS TEA5767to receive the FM band, the Sony CXA1691and phase-locked loop MCD2005RX combination to receive VHF200MHz band, the received signal will be saved by the WTV-NAND in the MP3or WAV format, and can be uploaded to the computer via the USB, the recording files can also be live played, all the operation can be operated by infrared remote, which enhance the user’s convenience.On the software using the C programming language, on one hand, the system can received the fixed known frequency wireless microphone signal, on the other hand, the system can automatically search for the unknown microphone signal and lock it, the signal strength, recording time, microphone frequency and so on related information can be displayed on the LCD screen, which enhance the user experience.The experimental results show the following:this products can automatically search for unknown wireless microphone signal and lock it to receive, saved on the recording chip. The entire system has reached the original design, achieved a satisfactory recording effect.