Design Of Digital Audio Amplifying Terminal In Form Of Bus

With the rapid development of digital technology and network technology,the products based on these combinations had been industrial upgraded sustainably in the future.Although it is gradually that audio electronic technology into the era of comprehensive digital networking intelligent,the pace is not consistent between different areas of each branch,compared with the recording system,audio amplifying system lags behind the process.In nowadays,there are more and more audio amplification terminal equipment and signal data,the resulting problem is that power cable wiring harder,line attenuation loss serious because of using analog signal transmission in traditional equipment.It has already unsuitable for long distance transmission in the building.According to the above problem,this subject is to design a digital audio amplifying terminal by controlled remotely.With principle analysis and system scheme comparison,choosing power over Ethernet supply technology,to solve the problem of complex power cable wire and power supply in the safety voltage;It helps to reduce high power consumption and low efficiency by using class D power amplifier in single chip;Using professional digital audio processing and transmission technology CobraNet,and professional audio bus protocol IIS,it can set terminal equipment by using professional digital audio processing and transmission technology controlled by PC software remotely.The part of hardware in this project,designed the audio transmission module based on technology of CobraNet,AD/DA module and peripheral circuit,POE power supply voltage conversion,and the single chip audio power amplifier module which is according to the requirements of system function design.In the part of software,it customs firmware program software and make files of the control program,so as to control PC hardware system remotely.This design can achieve 5W output under the condition of safety voltage range,high efficiency,low total harmonic distortion and the gain,pressure,limit equilibrium and PEQ parameters balance by remote control.