decibels definition psychology
The decibel (dB) is a measure of the ratio between two quantities, and is used in a wide variety of measurements in acoustics, physics and electronics.While originally only used for power and intensity ratios, it has come to be used more generally in engineering.n radio electronics, the decibel is used to describe the ratio between two measurements of electrical power. It can also be combined with a suffix to create an absolute unit of electrical power. For example, it can be combined with m for milliwatt to produce the  dBm .