Design Of Multi-channel Acoustic Signal Acquisition Device Based On Gigabit Ethernet

Acoustic signal acquisition technology is an important branch of data acquisition technology,which is gradually applied in various industrial and civil fields with the development of science and technology.Acoustic signal acquisition device with excellent performance is very important to improve the accuracy and real-time performance of acoustic signal acquisition and processing system Domestic and foreign acoustic signal acquisition products of this age all have their own shortcomings,such as expensive price,low flexibility,poor portability and so on.Therefore,this dissertation,based on the research of signal acquisition and transmission of acoustic signal,proposes a design scheme of G-bit Ethenet based multi-channel acoustic signal acquisition device,which can realize synchronous sampling,fast processing and also real-time uploading of multi-channel acoustic signals.The system also has certain flexibility and expansibilityThe main work of this dissertation is organized as follows:1.The design of the system overall framework.The system functions and technical targets are defined.Design and realize the system hardware circuit with a sub-and-main board structure.The selection of key chips,the schematic design of each circuit module and the PCB design of the two boards are all based on the functions and the technical targets.2.The design and implemention of FPGA's logic modules.The ADC interface module supports nulti-chip cascade and Synchronous sampling.The FIR digital fliter module with adj ustable parameters is based on DA structure or LMS algorithm The Ethemet MAC module is based on UDP transmission protocol and cyclic redundancy check(CRC).The management module of the system clock is based on integer frequency divider and Xilinx IP core.The connection and the control of these modules are realized by the top management module3.The software and hardware test platform is built to verify the correctness and validity of the system's different functions.System has three main functions,including acoustic signal acquisition function,G-bit Ethernet transmission function and digital filtering function.It has been proved that the system has the ability of 4-channel acoustic signal acquisition with an input range of ±5V and a maximum frequency range of 52.7 kHz.The DAQ device supports AC,DC and IEPE input mode and its dynamic range(SFDR)is up to 100dB,and can be used in anti-UAV system based on audio array.