State the concept of the decibel?

Answer 1

A unit used to express relative difference in power or intensity, usually between two acoustic or electric signals, equal to ten times the common logarithm of the ratio of the power out to power in.

Answer 2

The 'bel', and its more useful fraction the 'decibel', are units used to describe the
ratio of two powers, as for example, the ratio of the squares of the amplitudes of
two sounds.

Answer 3

Decibels are a unit of measurement of sound.

Answer 4

The decibel is a logarithmic scale to express the intensity of sound. A shift of ten decibels upwards represents a tenfold increase in power.