Design Of Multi-Channel Audio Signal Synchronization Acquisition System Based On DSP And FPGA

With the development of digital audio technology,people pay more and more attention to audio signal acquisition.In the process of audio signal acquisition,microphone arrays are often used to collect external sound.At present,there are many data acquisition systems on the market,but as far as microphone array data acquisition is concerned,these data acquisition systems cannot fully meet the specific requirements in terms of sampling path,sampling accuracy,synchronization and real-time.In this thesis,a multi-channel audio signal synchronous acquisition system is designed,which is commissioned by Acoustics Research Institute of Chinese Academy of Sciences.In this thesis,the specific needs of the client are analyzed,and a multi-channel audio signal synchronous acquisition system based on DSP and FPGA is designed,which meets the client's requirements for data acquisition of microphone array.In this design,microphone sensor array based on low noise MEMS microphone is used to collect external sound signals,four high precision ADC chips AD7768 are used to synchronously sample and convert 32 audio signals,a low-cost and high-speed FPGA chip EP4CE10E22C8N is used to design the corresponding data interface to receive and cache a large number of converted data,high performance and low power DSP chip TMS320F28335 is used to read and upload the collected data,fast Ethernet MAC controller DM9000A is used to realize real-time data upload to ensure the non-blocking transmission of large traffic data.The 32-channel audio signal synchronous acquisition system designed in this thesis has completed the debugging in the laboratory,and tested the accuracy and synchronization of 32-channel audio signal acquisition.Through the analysis and comparison of the experimental data,the design meets the technical requirements of the client and has been delivered to the Acoustic Research Institute of the Chinese Academy of Sciences for field testing.