Microcomputer Based Measurement and Simulation for Introductory Acoustics

该程序利用微型计算机来测量和记录时间分辨声信号，并模拟真实物理系统中的驻波和传播声波。新的实验室实验和模拟正在为两门对非理科生开放的声学课程开发，分别是音乐声学和电子声音物理。新设备包括六台带有声卡的微型计算机、一台联网激光打印机和六台计算机接口、数字合成函数发生器。在实验室实验中，用微型计算机记录和分析稳态和瞬态声音信号。人们正在开发软件来计算和显示波的振荡，模拟真实的物理意义，比如管乐器内部的驻波和弦和膜的机械振动。复杂的函数发生器与微型计算机连接，以方便频率相关的测量，如扬声器和放大器响应的测试。该计划扩展了一个非常成功的入门声学实验室，该实验室将快速傅立叶变换频谱分析仪用于频率分析音乐声音。学生可以从时间和频率互补的角度，以同等的精确度和准确性来研究重要的声学现象。

This program utilizes microcomputers to measure and record time- resolved acoustical signals and to model standing and propagating acoustic waves in real physical systems. New laboratory experiments and simulations are being developed for two acoustics courses open to non-science-majors, entitled Musical Acoustics and Physics of Electronic Sound. The new equipment includes six microcomputers with sound cards, a networked laser printer, and six computer-interfaced, digitally synthesized function generators. In laboratory experiments, steady-state and transient sound signals are recorded and analyzed with microcomputers. Software is being developed to calculate and display wave oscillations in simulations of real physical significance, such as standing waves inside wind instruments and mechanical vibrations of strings and membranes. Sophisticated function generators are interfaced to microcomputers to facilitate frequency-dependence measurements, such as tests of loudspeakers and amplifier response. The program extends a highly successful introductory acoustics laboratory that incorporated fast Fourier transform spectrum analyzers to frequency analyze musical sounds. Students can benefit from the ability to study with equal precision and accuracy important acoustical phenomena from the complementary perspectives of time and frequency.