Design And Implementation Of Wireless Recording Syestem

With the development of modern teaching system, the traditional teaching methods can not meet the needs of development, integrated multi-functional teaching system has been widely used in modern education. When using the multimedia, especially in the circumstance of many persons, it requires the aid of a wireless microphone. Wireless microphone gets rid of the shackles of wires, expands the teacher’s activity space. Whether in classroom or meeting, it will involve records, sometimes not only the pen and paper records are needed, but also need voice records. But in the case of many people, the background noise sometimes will be great, or even cover the voice recorded.The purpose of this paper is to design a recording system, especially for the wireless microphone recording, and it has the advantages of small size, low cost, low power and consumption for use etc. For occasions above, the analog audio wireless microphone principle and emission bands are studied, making the recording system universal.Firstly, this paper analyzed the frame of the system as a whole, determine the overall design. Taking the wireless microphone into account, introduce KT1602as receiver chips and MSP430F149microcontroller launched by TI as the core control chip. Secondly, design the power supply circuit system, the code and storage receiving section and a JTAG interface circuit, draw he circuit diagram of each module. This article focuses on the receivers, the performance characteristics of the storage SD card and decoder chip VS1003, working principle and design process. Software implement is based on the IAR software platform by using C language, study the IIC bus, SPI bus and SD card read under the FAT32file system and debug through connection between the JTAG interface and the MSP430development board. In the light of difference of the microphone frequency band of RF signal in microphone, use a EEPROM to set the signals frequency, adjust of the sliding rheostat to choose the channel.The result of system test shows record system can search signal of currently used wireless microphone, and store audio signal on the SD card and play the recording signal through the SD card. The whole system has met the initial design at the beginning.