What Is A Decibel? Can 'Negative' Decibels Exist?

The decibel is used to measure sound levels. It is represented by dB and is widely used in signals, communication, and electronics. The term decibel can be used to express an absolute value or a change in value (+1 dB or -1 dB).
Decibels are similar to the Celsius scale in the sense that it sets 0 as the freezing point of water, which means that this scale measures the temperature of things in relation to the freezing point of water. Likewise, 0 dB is the threshold of human hearing, i.e., the faintest sound the human ear can hear without artificial help.
0 dB means that you are right at the threshold of human hearing. A positive dB means the sound is a few times louder than the threshold, while a negative dB implies that you are a few times softer than that threshold.
#decibel #logarithms #unit
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[@tdumnxy]

I had a moment of clarity when the video used the water freezing point - 0 centigrade i.e. with reference to analogy - finally I think I will remember it! Thanks.

[@tmc1373]

EXCELLENT AND EASY TO UNDERSTAND VIDEO! THANK YOU SO MUCH!

[@ScienceABCII]

Glad it was helpful!

[@Slinkzii]

I'm happy that this random thought I searched up had a video

[@PhuttisunThongsungwon]

same as me

[@matiasvicuna3926]

Gracias

[@Kevguitt]

Very well made video, thanks!

[@mohamedelaminenehar333]

i like it we need more )

[@Dale_Blackburn]

Nice video

[@syahrialrasyid2539]

thanks a lot

[@Beats_and_Shades]

Question.. if i have a sound preset and I turn the master bass volume of that preset all the way down to -10db, do all the bass frequencies disappear or are they just unhearable ? Many thanks

[@ChuckN0rr1st]

No, decibel is just a ratio between source and target signal. If you keep the preset on default, it will be at 0 db (unchanged). If you decrease below zero, you will reduce the volume relative to the original signal. -10db is somewhat ~30% of the originally volume. Your original audio signal is basically that reference point for db adjustment. The video talked about another reference point for decibel measurement. The absolut quietest noise a human could hear. This is often used to describe how much louder our environment is compared to perceived, complete silence.

[@JimBoom92]

sorry but this video created more questions than it answered.

[@galaxie12]

agreed. totally useless for practical purposes.