decibl with reference to one milliwatt

简明释义

毫瓦分贝

英英释义

例句

1.The sound level of this concert is measured at 100 decibels with reference to one milliwatt.

这场音乐会的声级测量为100以1毫瓦为参考的分贝。

2.The noise level in a library is typically about 40 decibels with reference to one milliwatt.

图书馆的噪音水平通常约为40以1毫瓦为参考的分贝。

3.When testing microphones, we often refer to their sensitivity in decibels with reference to one milliwatt.

在测试麦克风时，我们经常以以1毫瓦为参考的分贝来说明它们的灵敏度。

4.Rock concerts can exceed 120 decibels with reference to one milliwatt, which can be damaging to hearing.

摇滚音乐会的音量可以超过120以1毫瓦为参考的分贝，这可能会损害听力。

5.A whisper is generally around 30 decibels with reference to one milliwatt.

耳语的音量通常在30以1毫瓦为参考的分贝左右。

作文

In the field of acoustics and electronics, understanding sound levels and signal strength is crucial. One of the most common units used to measure these levels is the decibel. The term decibel with reference to one milliwatt refers specifically to a logarithmic unit that expresses the ratio of a particular power level to a standard reference power level, which is one milliwatt (mW). This reference point is significant because it provides a consistent baseline for comparing different sound intensities or signal strengths.The decibel scale is not linear; instead, it is logarithmic, meaning that each increase of 10 dB represents a tenfold increase in power. For example, a sound measured at 30 dB is ten times more powerful than one measured at 20 dB. This characteristic makes the decibel scale particularly useful for representing a wide range of sound levels, from the faintest whispers to the loudest rock concerts.When we say decibel with reference to one milliwatt, we are often discussing audio equipment and telecommunications. In audio systems, this measurement helps engineers determine how loud a speaker will be when it receives a certain amount of power. For instance, if a speaker has a sensitivity rating of 90 dB at 1 mW, it means that it will produce 90 decibels of sound when supplied with one milliwatt of electrical power. This information is essential for designing sound systems that can deliver the desired volume without distortion.In telecommunications, the concept of decibel with reference to one milliwatt is equally important. Signal strength is often measured in dBm, where 'm' stands for milliWatt. A signal strength of 0 dBm indicates a power level of one milliwatt, while a signal strength of -30 dBm indicates a much weaker signal, equivalent to just 0.001 mW. Understanding these measurements allows engineers to optimize signal transmission and ensure reliable communication.Moreover, the use of decibel with reference to one milliwatt extends beyond audio and telecommunications. It is also relevant in fields such as acoustics, where it helps in assessing noise pollution levels. For instance, city planners may use decibel measurements to evaluate the impact of traffic noise on residential areas. By measuring the sound intensity in decibels, they can implement regulations to mitigate excessive noise and enhance the quality of life for residents.In conclusion, the phrase decibel with reference to one milliwatt is a fundamental concept in various scientific and engineering disciplines. It serves as a critical reference point for measuring sound levels and signal strengths, enabling professionals to make informed decisions in their respective fields. Whether in audio engineering, telecommunications, or environmental science, understanding decibels in relation to one milliwatt allows for better design, optimization, and regulation of sound and signals in our everyday lives.

在声学和电子学领域，理解声音水平和信号强度至关重要。最常用来测量这些水平的单位之一是分贝。术语以一毫瓦为参考的分贝特指一种对数单位，表示特定功率水平与标准参考功率水平（即一毫瓦（mW））的比率。这个参考点很重要，因为它提供了一个一致的基线，用于比较不同的声音强度或信号强度。分贝尺度不是线性的；相反，它是对数的，这意味着每增加10 dB表示功率增加十倍。例如，测得30 dB的声音比测得20 dB的声音强大十倍。这一特性使得分贝尺度特别适合表示从最微弱的耳语到最响亮的摇滚音乐会的广泛声音水平。当我们说以一毫瓦为参考的分贝时，我们通常是在讨论音频设备和电信。在音频系统中，这种测量帮助工程师确定扬声器在接收一定功率时的音量。例如，如果一个扬声器的灵敏度评级为90 dB（1 mW），这意味着当其供电为一毫瓦时，它将产生90分贝的声音。这些信息对于设计能够在不失真的情况下提供所需音量的音响系统至关重要。在电信领域，以一毫瓦为参考的分贝这一概念同样重要。信号强度通常以dBm为单位测量，其中'm'代表毫瓦。0 dBm的信号强度表示功率水平为一毫瓦，而-30 dBm的信号强度则表示信号较弱，相当于仅0.001 mW。理解这些测量允许工程师优化信号传输，确保可靠的通信。此外，使用以一毫瓦为参考的分贝的概念不仅限于音频和电信。它在声学等领域同样相关，帮助评估噪音污染水平。例如，城市规划者可以使用分贝测量来评估交通噪音对居民区的影响。通过测量声音强度（以分贝为单位），他们可以实施法规以减轻过大的噪音，并提高居民的生活质量。总之，短语以一毫瓦为参考的分贝是各个科学和工程学科中的基本概念。它作为测量声音水平和信号强度的重要参考点，使专业人士能够在各自领域做出明智的决策。无论是在音频工程、电信还是环境科学中，理解与一毫瓦相关的分贝都能更好地设计、优化和调节我们日常生活中的声音和信号。