# What is the Full Form of dB?

The full form of dB is Decibel. By comparing it to a reference value, a decibel is a unit used to quantify the strength of an electrical signal or the loudness of a sound. Since the decibel scale is logarithmic, an increase of 10 decibels corresponds to a tenfold increase in the sound or signal’s strength.

Decibel is how we measure sound. It’s represented by the letter ‘dB’. Decibel is a way to compare how loud something is to something else, using a logarithmic scale. This scale is called the power level or field level, depending on what you are measuring.

## What is the Decibel Scale?

Our ears can handle sounds from really quiet to super loud. So instead of using a simple scale, we use a logarithmic scale to show sound levels more accurately. This scale is known as the decibel scale.

• On the decibel scale, the quietest sound you can hear is 0 dB.
• If something is 10 times louder than that, it’s 10 dB.
• If it’s 100 times louder than the quietest, it’s 20 dB.
• And if it’s 1,000 times louder than the quietest, it’s 30 dB.

Since decibel is a unit of measurement for sound intensity. Decibels are used to gauge a signal’s strength for electrical transmissions, though. Decibels can be written as “dB” or as a ratio, such “20 dB” or “20 dB relative to 1 mW.” Because it is more practical and compact than using a linear scale to convey huge ratios, the decibel scale is frequently employed.

Also Read: Career in Sound Engineering

## History of dB

The word “decibel” was created by Alexander Graham Bell, an American engineer, in the early 1900s. Bell was working on making the telephone system better and wanted a simpler way to talk about the differences in power levels.

He first used the word “decibel” in a 1907 paper to the American Association for the Advancement of Science, explaining that it meant one-tenth of a Bel, which is a logarithm of the power level ratio. This idea caught on in telecommunications and has since been used in many other areas to show the difference between quantities on a logarithmic scale.

Also Read: How to Become a Sound Engineer?

## Examples of Decibel Scale Use?

Some of the examples are –

• Sound intensity measurement: Decibels are frequently used to represent how loud a sound is. The louder the sound, the greater the decibel level.
• Comparing electrical signal strength: In electronics, decibels are frequently used to compare electrical signal strength.
• Acoustics: For the measurement of sound pressure level.
• Telephony and audio – Used as a frequency-weighted power for audio noise measurements.
• Video and Digital Photography: The relative loss/gain of decibels are used to evaluate link losses in optical communications and, interestingly, as a measure to characterize light intensity ratios in the fields of optics, video, and digital photography.

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