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【速搜问答】背景噪声是什么

问答 admin 2个月前 (08-04) 50次浏览 已收录 0个评论

汉英对照:
Chinese-English Translation:

背景噪声也称为“本底噪声”,一般指在发生、检查、测量或记录系统中与信号存在与否无关的一切干扰。但在工业噪声或环境噪声测量中则是指被测噪声源以外的周围环境噪声。

Background noise, also known as “background noise”, generally refers to all interferences that have nothing to do with the presence or absence of signals in the generation, inspection, measurement or recording system. But in the measurement of industrial noise or environmental noise, it refers to the ambient noise outside the measured noise source.

背景噪声,一译“本底噪声”。一般指在发生、检查、测量或记录系统中与信号存在与否无关的一切干扰。但在工业噪声或环境噪声测量中则是指被测噪声源以外的周围环境噪声。如对在工厂附近的街道测量噪声来说,若要测量的是交通噪声,则工厂噪声便是背景噪声。若测量的目的在于测定工厂噪声,交通噪声便成为背景噪声。在噪声测量过程中.必须注意背景噪声的干扰程度。

Background noise. Generally, it refers to all interferences that have nothing to do with the presence or absence of signals in the occurrence, inspection, measurement or recording system. But in the measurement of industrial noise or environmental noise, it refers to the ambient noise outside the measured noise source. For example, if traffic noise is to be measured in the street near the factory, the factory noise is the background noise. If the purpose of the measurement is to measure the factory noise, the traffic noise becomes the background noise. In the process of noise measurement, attention must be paid to the interference degree of background noise.

简述

sketch

背景噪声不能影响人们对主体声音的接听,尤其是在需要安静的时候,音乐不只是声音,更是一种无声的旋律——此时重要的是不能引入一点噪声,如电扇的隆隆声、交通的嘈杂声。噪声评价曲线(NC)是用来鉴定背景噪声的常用标准。

Background noise can not affect people’s listening to the main voice, especially when it is necessary to be quiet. Music is not only a sound, but also a silent melody. At this time, it is important not to introduce a little noise, such as the rumble of electric fans and the noise of traffic. Noise evaluation curve (NC) is a common standard used to identify background noise.

然而,噪声评价曲线只适用于连续且非时变的不含信息的声波。当声波携带重要信息,如精彩的演讲或美妙的旋律,这时就必须有更加严格的标准。

However, it is not suitable for the evaluation of time-varying information only. When sound waves carry important information, such as a wonderful speech or a wonderful melody, there must be stricter standards.

在某些场合,并不是越安静就越好。如果降低背景噪声时可能会突显另一些先前隐藏着的噪声。背景噪声可以在人们毫无觉察的情况下增强到噪声评价值的水平。这种噪声掩蔽法要比控制噪声法经济得多。

In some cases, the quieter the better. If the background noise is reduced, other previously hidden noises may be highlighted. Background noise can be enhanced to the level of noise evaluation value without people’s awareness. This noise masking method is more economical than the noise control method.

有必要为举行特殊活动的场所建立特殊标准。例如在录音棚里,噪声标准的精确度要达到录音设备最低噪声值的水平,但又要高于录音者的听阈,这样在录音一开始,录音者便可清晰的区分噪声源,而这些噪声又不会从磁带上被听到。

It is necessary to establish special standards for venues where special events are held. For example, in the recording studio, the accuracy of the noise standard should reach the lowest noise level of the recording equipment, but it should be higher than the hearing threshold of the recorder. In this way, at the beginning of recording, the recorder can clearly distinguish the noise sources, and the noise will not be heard from the tape.

背景噪声的影响

Influence of background noise

在某场地测定某噪声源的噪声级时,其他噪声源传到该场地的噪声(将这种噪称为背景噪声)通常不可能予以排除,而只能进行总体测量,这就使要测之噪声源的声级产生一定的偏差。这就是背景噪声的影响。

When the noise level of a noise source is measured at a certain site, the noise transmitted to the site by other noise sources (called background noise) is usually impossible to be excluded, but the overall measurement can only be carried out, which makes the sound level of the noise source to be measured produce a certain deviation. This is the effect of background noise.

如果能够排除其他噪声源,这个同题不存在了,但对于多数场合来说,干扰的声源并非特定的,而且为数较多,想予以除是困难的。

If other noise sources can be excluded, the same problem does not exist, but for most occasions, the noise sources are not specific and there are many, so it is difficult to divide them.

然而,排除要测定的噪声源(所谓“象”噪声源)是比较容易的。首先停止对噪声源的发定,仅测定背景噪声的噪声级然后再测定对象噪声源和其他噪声源所构的复合噪声的声级。若背景噪声的强度比合噪声的强度低 10 分贝以上的话,那么由背景噪声所造成的影响将低于 1 分贝,即以视为无背景噪声的干扰。当两者之差小 10 分贝时,按对复合噪声的强度以修正后,可以求得对象噪声源的大概噪声级。

However, it is easy to exclude the noise source to be measured (so-called “image” noise source). Firstly, the determination of noise source is stopped, only the noise level of background noise is measured, and then the sound level of compound noise composed of object noise source and other noise sources is measured. If the intensity of the background noise is more than 10 dB lower than that of the combined noise, the influence caused by the background noise will be less than 1 dB, that is to say, it is regarded as the interference without background noise. When the difference between them is less than 10 dB, the approximate noise level of the object noise source can be obtained by correcting the intensity of the composite noise.


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