These are sometimes given in brackets: dB(A). In order to come close to the perceived volume of a sound, frequency-dependent weighting filters were introduced for decibels. The intensity with which a certain sound pressure level is perceived depends on the height or frequency of the sound. The pure sound pressure level does not take into account an important characteristic of the human hearing when perceiving volume. What also makes the perception of volume different The zero corresponds to the highest achievable value, accordingly, other values are displayed in the minus range. This scale is used in digital signal processing. This is usually the unit dBFS (decibels relative to full scale). In the HiFi range, it is more common for amplifiers to display negative dB values. This table shows different sound events and the corresponding decibel value: Sound measurement We then inevitably cover our ears and damage to our hearing can occur after a short time. At a volume of 120 dB, the pain threshold for the human ear is reached. A doubling results from an increase from 50 to 60 decibels. A chainsaw with a volume of 120 dB produces a much higher sound pressure level than an average conversation with 60 dB. In order to be able to correctly classify volume data in decibels, one must know that doubling the dB value does not mean doubling the sound pressure level. To product The Decibel table: sound and their dB Decibel on the ears – headphones at Teufel If this is visualized in a curve, it does not rise constantly but becomes steeper and steeper as the curve progresses. Thus, a zero is added to each value on the scale. With a logarithmic scale, the values are increased tenfold at defined intervals. Therefore decibels are used as logarithmic auxiliary units. With a linear scale, this could not really be shown in a meaningful way, because differences would not be visible at low levels. If the sound pressure level is low, we can already perceive small changes in air pressure, but at higher levels, the changes in air pressure must be significantly greater in order to be perceptible. Range, therefore, extends over several orders of magnitude (number of digits for numbers). The perceptible changes in sound pressure lie in a range between 0.00002 Pascal and 20 Pascal. The fact that the correlations in volume data are somewhat more complicated is due to the human hearing. Why do we not find any Pascal but decibel values in the audio range? This is why the term sound pressure level is often used in connection with volume – and the sound pressure is measured in the unit Pascal. What we perceive auditory are changes in air and sound pressure.
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