Decibel (FRESH ⇒)

: Many free apps are available on the Google Play Store or Apple App Store. While convenient for general checks, they may lack the calibration required for official evidence.

: Adding a second identical sound source (e.g., two identical 60 dB vacuum cleaners) increases the total level by only 3 dB , resulting in 63 dB, not 120 dB. Decibel

The is a logarithmic unit used to express the ratio between two values, most commonly sound intensity or electrical power. Unlike linear scales (like inches or pounds), the decibel scale compresses vast ranges of numbers into manageable figures, reflecting how human senses—specifically hearing—actually perceive change. Core Concepts : Many free apps are available on the

, the threshold of human hearing. In digital audio, (Full Scale) measures signal level relative to the maximum a system can handle before clipping. Examples of Common Decibel Levels The is a logarithmic unit used to express

: A decibel always requires a reference point. In acoustics ( dB SPL ), the reference is