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The linear scale for loudness doesn’t provide sufficient resolution at low amplitudes to show changes that might actually be perceptible to the human ear.
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NIOSH SLM app (iOS only) The NIOSH app is an easy-to-use noise dosimeter showing your noise exposure in real time. It also displays the noise level in real-time and your average noise level exposure in numerical and graph form. We humans can more easily distinguish the difference between two low amplitude sounds that are close in amplitude than we can distinguish between two high amplitude sounds that are close in amplitude. With this app, youll see a visual display of your noise level on a graph. A linear scale turns out to be a very poor representation of human hearing. Although we perceive a vacuum cleaner to be approximately twice as loud as normal conversation, we would hardly be able to see any difference between their respective air pressure amplitudes if we have to include such a wide range of numbers, spacing them evenly on what is called a linear scale. Thus, our ability to show small changes at low amplitude would not be great. This axis would have to be compressed to fit on a sheet of paper or a computer screen, and we wouldn’t see much space between, say, 100 and 200. Ein maximaler analoger Momentanwert erzeugt dabei näherungsweise einen maximalen positiven oder negativen digitalen Abtastwert, entsprechend der digitalen Wortbreite des A/D-Wandlers eine Aussteuerungsreserve ist nicht vorhanden. The decibel range and resolution of a sound meter display may be similar to the dynamic range of the human ear but usually only in the louder range. We would need numbers ranging from 0 to 10,000,000 on the vertical axis (Figure 4.1). dBFS, englische Abkürzung für Decibels relative to full scale, ist die logarithmische Einheit mit absoluter, oft linearer Skala in einem digitalen tontechnischen System. The decibel scale (dB) measures a sound’s loudness. Imagine a graph of sound loudness that has perceived loudness on the horizontal axis and air pressure amplitude on the vertical axis. From column 3, you can see that the sound of a nearby jet engine has on the order of times greater air pressure amplitude than the threshold of hearing.
![decibel full scale decibel full scale](https://thumbs.dreamstime.com/b/decibel-scale-decibel-scale-sound-level-102089570.jpg)
No doubt you’re familiar with the use of decibels related to sound, but let’s look more closely at the definition of decibels and why they are a good way to represent sound levels as they’re perceived by human ears.įirst consider Table 4.1.