- published: 14 Sep 2014
- views: 182909
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. A decibel is one tenth of a bel, a seldom-used unit.
The decibel is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory. In electronics, the gains of amplifiers, attenuation of signals, and signal-to-noise ratios are often expressed in decibels. The decibel confers a number of advantages, such as the ability to conveniently represent very large or small numbers, and the ability to carry out multiplication of ratios by simple addition and subtraction.
The decibel symbol is often qualified with a suffix, that indicates which reference quantity or frequency weighting function has been used. For example, dBm indicates a reference level of one milliwatt, while dBu is referenced to approximately 0.775 volts RMS.
Rebel racer speeding on
Will you ever reach the sun?
Blazing chrome, gleam machine
Fastest thing you've ever seen
Melting rubber clear a turn
You can smell the tires burn
Rapid speed, really steaming
Beyond the realms of death
With each unspoken breath
There's nothing you can't face
In a death race
Straightforeward course not hard to hold
Into the mists, nights so cold
You create a battle zone
Engine grinds to the bone
Smell of gas fills the air
Fuel leak, best beware
Driving hard, no second thought
Warning lights, don't get caught
Aiming for the blazing sun
So close he thinks the battle's won
Fuel blows from a single spark
Fireball lights up the dark
Rebel racer is no more
Battle's lost, black smoke and gore
Time forgets another soul
One more mark on the death toll
Beyond the realms of death
With each unspoken breath
Explosion leaves no trace