Design And Implementation Of Four Channels High Speed Synchronous Sampling In Sound Source Localization System

Auditory system is an important part of the human senses. With the rapid development ofthe digital signal processing technology,electrical technology and intelligent robot technology,sound source localization technology has become important research subjects in the field ofrobotics research.Sound has diffraction characteristics and can effectively circumvent obstaclesto reach the target,so it can make up for the the limitations of visual aspect of robot inpositioning.Data acquisition is to convert the analog signal to digital signal for calculation andprocessing of computer, the scope of its application is more and more widely now.In soundsource localization system, the sampling frequency, synchronization and transmission rate ofdata acquisition have a great influence on the sound sampling, which will affect the positioningprecision and accuracy. A high sampling frequency, convenient interface, high transmissionspeed of the synchronous data acquisition system can effectively improve the precision andaccuracy of the positioning system, which also can be applied to other areas.Combined the performance advantages of USB2.0and FPGA, this paper proposes a designmethod of four channel high speed synchronous acquisition system. Based on the functionrequirement of the system, this paper mainly completed the hardware design and softwaredevelopment.Hardware mainly consists of three parts: the analog-to-digital conversion module,FPGA module and USB module. We choose FPGA of Altera Corporation as the control core, theAD9219AD converter of AD Company, CY7C68013USB control chip of the CypressCompany to complete hardware design, and use Altium Designer software design and draw the4layers PCB. System software development includes the FPGA control logic program, USBfirmware development and writing of the application user interface.In sequential digital logic design, through the use of the abundant resources in FPGA, such as phase-locked loop PLL,double port RAM, shift register, etc., the accurate control of the system clock and high speeddata transmission with USB interface are implemented. The LabVIEW software is used to writeapplication user interface, the communication between the host and device is completed by thedirect call of general USB driver; finally control of the acquisition system in the upper machineis achieved.