| In recent years, wireless technology is rapidly exception, and be made in a gradual penetration into all areas of daily life, such as wireless access, wireless network, wireless intelligent home appliances and so on.At the same time, as wireless technology innova tion ,people are increasingly keen to use in other applications of such technology. Particularly in some circumstances, the cost of laying and maintaining cable lines is too high or the signal which users need to collect is in a state of motion. These make transfering data by cable is not reliable.The radio frequency transceiver module based on wireless technology just to make up these shortcomings.Based on this concept and ideas, the first course of development of wireless commu nication, development status and future trends has been discussed, and will communicate with the wired way of comparison, dig out the advantages of wireless transmission technology. Secondly, since this system is to be achieved by the transmission of audio signals, so the understandig of audio signal coding / decoding method is essential. Finally, the system's hardware and software is not only the difficult part,but also the important one.Hardware design includes a feature comparison and choice of chips, circuit schematic drawing and design part of the interference. nRF905 Wireless Module, with micro-control MCU, TLV series of audio encoding / decoding chips are selected into reference program, because of its functionality and cost which can meet the design requirements.Compared with some similar ones, these chips can be formed a wireless audio transmission small systems.The software components set the miro-control module,respectively,audio encoding/ decoding module and the wireless transmission module according to modularization settings of system. and procedure for the preparation of the individual key. This makes the system function more perfect and achieves the purpose of combining software and hardware.The characteristics of design is energy saving with safety, high reliability, convenient installation, and strong anti-interference . It can be achieved not only short-range wireless transmission and control of the audio signal , but can carry or embedded into other functional modules and systems, which can achieve wireless transmission of multiple reference signal . |
