软硬件结合的声音抽样与恢复实验

Sound Sampling and Recovery Experiment Based on Software and Hardware

时域抽样是“信号与系统”课程及其工程应用中重要知识点,但课堂教学内容注重理论分析,难以提高学生的学习兴趣。通过设计“敲琴声音抽样”实验,利用计算机声卡中的A/D、D/A转换芯片和Simulink软件,软、硬件结合,实现系统调试、数据录取与数据分析,实现抽样频率可调的实际抽样与恢复实验。通过实验设计、调试以及对实验数据的时频域分析,可加深学生对时域抽样定理的理解,进一步培养其创新精神和实践能力。

Time domain sampling is an important knowledge point,and is closely related to engineering applications in the course of“Signals and Systems”.However,the main content of the teaching focuses on theoretical analysis,by which is difficult to improve students’interest in learning.Thus,we design the“piano sound sampling”experiment by using the analog-digital and digital-analog conversion chips in the computer sound card and Simulink software.The software and hardware are combined to realize the system debugging,data recording and data analysis,complete the actual sampling and recovery experiment with adjustable sampling frequency.Through the design and debugging of the experiment,and the time-frequency domain analysis of the experimental data,students can deepen their understanding of the time-domain sampling theorem,and cultivate their innovative spirit and practical ability.