The Mitsubishi Advantage
Ultra-Quiet Technology
Sound in our Daily Environment
Measuring Noise Level
A decibel is a logarithmic unit used to compare a measured signal, with a reference
level. When measuring sound, the reference level (0dBA) is perceived as silence.
The fact that decibels are logarithmic means that a difference of only a few decibels
actually resurts in a large difference in the audible sound level.
For example:
An increase of 3dBA = double the sound level
An increase of 7dBA = 5 times the sound level
Comparing 40dB(A) to 27dB(A)
| | Extremely Quiet | Very Quiet | Low Noise | Noisy | | dBA | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40+ | | Audible (%) | | 8% | | | | 20% | | 30% | | 80% | | | 100% | | |
Less than 10%
the noise by
comparison! |  |
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