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首页> 美国政府科技报告 >Effectiveness of Predictive Computer Programs in the Design of Noise Barriers - A Before and After Approach. Part I. The Data Acquisition System.
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Effectiveness of Predictive Computer Programs in the Design of Noise Barriers - A Before and After Approach. Part I. The Data Acquisition System.

机译：预测计算机程序在噪声屏障设计中的有效性 - 前后方法。第一部分数据采集系统。

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摘要

A digital data acquisition system has been designed to meet the need for a long duration noise analysis capability. By sampling the DC outputs from sound level meters,it has been possible to make twenty-four hour or longer recordings,in contrast to the one-hour recordings on seven-inch analog tape reels. The system is made up of a digital tape recorder,an analog-to-digital converter,an outdoor microphone unit, a weatherproofed microphone,two B & K sound level meters,and other miscellaneous equipment. It has the capability of recording and analyzing data from up to eight channels in linear or decibel format. The operation of the system in terms of its setup, calibraton,and the recording of digitized signals,as well as the computer programs used to analyze the signals,are described in this report. Listings of computer programs and of a sample problem are supplied in the appendixes.

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