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正常人刚能听到的最小的声音叫做听阈,听阈的声强为0分贝; 轻声耳语时30分贝,一般交谈时60分贝,大声吵嚷时80~90分贝, 以下是不同分贝水平的声音对应的情境和影响:0-20分贝:非常安静,几乎感觉不到声音。 20-40分贝:相当于轻声说话,如图书馆里的安静环境。 分贝(dB)是衡量声音强度的单位,0分贝为人耳最小可听声(如羽毛飘落),超140分贝会直接损伤听力(如飞机引擎)。 声音每增加10分贝,强度增强10倍,对耳部冲击呈指数级递增。
对于声音,“分贝”是这样定义的:我们将某一个声压值定义为“标准值”(0分贝),这是一个固定的值;任何一个声音,都和这个标准值相除,取结果的对数(以10为底),再乘以20,这样算出来的就是这个声音的分贝。 本文详细介绍了分贝的概念及其在声音强度测量中的应用,包括功率类与电压类分贝的计算公式,并深入探讨了声压级的概念及音频文件分贝数的计算方法。 用一个分贝测试仪,实测电脑的噪音是多大,见过60分贝的呼噜吗,听力测试! 你达标了吗? ,比较:最响亮的声音,临街噪音实测,开窗50多分贝会影响休息吗?
此计算器对于规划和优化声音系统设置、环境噪声控制以及了解室内外环境中的声音传播至关重要。 它有助于确定距离如何影响声级,这对最大程度地减少噪音污染以及确保音乐会、剧院和公共地址系统中的音质至关重要。
欢迎分享本文,引用请注明出处并链接至本文! 来源:建环视界. 噪声加减在线计算器:分贝相加/相减. 搜索 当前位置: 小程序 噪声计算器 噪声加减在线计算器:分贝相加/相减 “分贝”是这样定义的:我们将某一个声压值定义为“标准值”(0分贝),任何一个声音,都和这个标准值相除,取结果的对数(以10为底),再乘以20,这样算出来的就是这个声音的分贝,由此可见分贝数是可以为负数的。 基于各设备线性工作条件的假设,通过分贝,我们可以根据扬声器前级设备的输出电压变化,准确判断听音位置的声强变化。 例如,当麦克风输出电压翻倍时,从麦克风到混音器、信号处理器、功率放大器,最终到达听音位置的声强会增加6分贝。
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