What is a db
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A decibel (dB) is a logarithmic unit used to measure the ratio between two values of physical quantities, such as sound pressure, voltage, or power. In audio, it is not an absolute measurement like an inch or a gallon; instead, it describes how much greater or smaller one level is compared to a specific reference point.
- 1.Identify the specific reference point being used, such as dB SPL for acoustic pressure, dBu for analog voltage, or dBFS for digital levels.
- 2.Use decibels to measure the ratio between two signals rather than a fixed quantity, as 0dB simply means the output equals the input.
- 3.Apply the logarithmic scale to handle the massive range of human hearing, which spans from the quietest whisper to a jet engine.
- ×Never assume '0dB' means silence; in digital audio (dBFS), 0dB is the maximum limit before clipping, while in acoustic space (dB SPL), it is the threshold of human hearing.
- ×Avoid confusing power ratios with voltage ratios, as a 6dB increase doubles voltage, but only a 3dB increase doubles power.
A change of 3dB represents a doubling of power, but it takes a 10dB increase for the human ear to perceive a sound as 'twice as loud.'
Based on AI training data — may not reflect current information.
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