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首页> 外文会议>International Congress on Sound and Vibration >AN IMPLEMENTATION ON PROTOTYPE COMPACT SYSTEM OF TWO-CHANNEL ACOUSTIC DISTANCE MEASUREMENT METHOD MEASURABLE FROM OM BASED ON THE STANDING WAVE CONSIDERING DIRECT CURRENT COMPONENT AND PHASE SPECTRUM
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AN IMPLEMENTATION ON PROTOTYPE COMPACT SYSTEM OF TWO-CHANNEL ACOUSTIC DISTANCE MEASUREMENT METHOD MEASURABLE FROM OM BASED ON THE STANDING WAVE CONSIDERING DIRECT CURRENT COMPONENT AND PHASE SPECTRUM

机译：基于直流分量和相位谱的常设波可测量的双通道声距测量方法的原型紧凑型系统的实现

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The distance to a target is basic information in many engineering fields. Recently, the acoustic distance measurement (ADM) method based on the phase interference between transmitted and reflected waves has been proposed. The power spectrum of an observed signal is a periodic function whose period is inversely proportional to the distance between microphone and target. So this ADM is a practical method that just applies Fourier transform to the power spectrum. Furthermore, the theoretically expanded ADM method has been proposed, which can measure the distance from 0 m by introducing analytic signal instead of power spectrum, where the analytic signal is derived from the power spectra of observed signals of two-channel (2ch) microphones. However, when the distance from a target is very close, the expanded ADM method has error due to Direct Current (DC) components of the power spectra. Besides, authors attempted to implement the ADM method measurable from 0 m with the power spectra into compact system. However, the compact system did not have enough computational power. This paper describes a fundamental study on the ADM method by using the phase spectra of observed signals of 2ch microphones instead of the power spectra and an implementation of the ADM method into prototype compact system introducing high speed microcomputer system, considering DC component of the power spectra. More concretely although the phase spectrum is also a periodic function whose period is inversely proportional to the distance between microphone and target, it has no DC components. We confirmed the validity of the new ADM method measurable from 0 m with phase spectrum by performing a computer simulation and by applying it to an actual sound field and also confirmed the effectiveness of prototype compact system by implementing this ADM theory.
机译：到目标的距离是许多工程领域中的基本信息。最近，提出了基于透射和反射波之间的相干扰的声学距离测量（ADM）方法。观察信号的功率谱是周期性的函数，其周期与麦克风和目标之间的距离成反比。因此，该ADM是一种实用的方法，即将傅里叶变换应用于功率谱。此外，已经提出了理论上扩展的ADM方法，其可以通过引入分析信号而不是功率谱来测量0 M的距离，其中分析信号来自来自双通道（2CH）麦克风的观察信号的功率谱。但是，当从目标的距离非常接近时，由于功率谱的直流电流（DC）组件，扩展的ADM方法具有错误。此外，作者试图将可测量的ADM方法与0米以0米进行测量，进入紧凑型系统。但是，紧凑的系统没有足够的计算能力。本文介绍了通过使用2Ch麦克风的观察信号的相位谱而不是功率谱的相位光谱和ADM方法的实施方式对高速微型计算机系统的原型紧凑型系统，考虑到高速微电脑系统的基本研究。 。更具体地说，虽然相谱也是一个周期性的函数，但其​​周期与麦克风与靶之间的距离成反比，但它没有DC组件。通过执行计算机仿真并将其应用于实际声场，我们确认了从0M测量的新ADM方法的有效性，并通过实现该ADM理论来确认原型紧凑系统的有效性。

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