The decibel scale is a "logarithmic" scale, meaning that in order to move up by the same amount from any starting point, you don't add the same amount, you multiply by the same amount.
For example, if I increase the loudness of my harmonica from 1 watt to 2 watts, while you crank your Electric Guitar up from 1,000 watts to 2,000 watts, both of us doubled our original sound power, and increased our sound by the same number of decibels.
It's important to understand that the number of decibels always means the size of the change from the original amount. Some number of decibels is not a quantity that you can hold in your hand. It's always a comparison between the original and the final. When you see a number of decibels stated, the original value is always lurking somewhere nearby, or else it's clearly understood.
Increasing the original power means adding dB. Decreasing the original power means subtracting dB (or adding negative dB).
Multiplying the original power by 10 is an increase of 10 dB. Dividing the original power by 10 is a decrease of 10 dB.
Technically, the way to calculate the dB of change is
dB = 10 times the log of [(new power) divided by (old power)].
Some quick and easy approximate numbers to remember, so you don't have to calculate it every time:
Multiply or divide by 2 ==> plus or minus 3 dB
Multiply or divide by 4 ==> plus or minus 6 dB
Multiply or divide by 5 ==> plus or minus 7 dB
Multiply or divide by 8 ==> plus or minus 9 dB
Multiply or divide by 10 ==> plus or minus 10 dB (definition)
Example:
-- Increase power from 1 watt to 40 watts ==> Multiply power by 40.
x 40 = product of (10 x 2 x 2) = +10dB + 3db + 3db = +16 dB.
This is exactly the same as the change from 1 billion watts to 40 billion watts ... still +16dB, because it's the changethat counts in dB.
-- Decrease power from 100 watts to 25 watts. Divide 100 by 2 (get 50), then divide 50 by 2 (get 25).
Divide by 2 the first time ==> minus 3 dB. Divide by 2 the second time ==> minus 3 more dB.
So 25 watts is 6 dB below 100 watts.
When referring to the standard decibel scale as a measurement of the intensity of sound, it is important to note that 0 dB is set at 10-12W*m^(-2). In the above equation for dB, if you are using the standard scale, always use 10-12 as your (old power) value.
The decibel scale is a logarithmic scale. Scroll down to related links and look at "Decibel - Wikipedia" and "Sound level meter - Wikipedia".
Psycho acousticians say that 10 dB level difference double the felt loudness. well apex begs to differ!
1 decibel of increase of sound level is the smallest increase (or decrease) in level that may be discerned by the average person. It corresponds to an increase in level of about 25%. [The 10th root of 10 is another similar expression.] The decibel was initially used to measure changes in signal level in a line. Named after Alexander Graham Bell. One Bell - 10dB - sounds twice as loud to those same average individuals.
There is no point in doing either one of these. A decibel, being the log of a ratio, is added to or subtracted from another decibel.
a decibel meter.
The decibel scale is a logarithmic scale. Scroll down to related links and look at "Decibel - Wikipedia" and "Sound level meter - Wikipedia".
decibel scale
It's a logarithmic scale.
Really good
The decibel scale was originally used to quantify signal loss in a telephone circuit. The original unit, bel, was named in honor of Alexander Graham Bell. The decibel was devised by the Bell Telephone Laboratories in the 1920's.
The decibel scale is a logarithmic scale. An increase of 10 points on the decibel scale means that the energy increases by a factor 10; an increase of 20 decibels means an energy increase by a factor of 10 x 10 = 100, etc.
Decibel (dB) * The Bel is the primary unit. However, the scale is too large. So for human hearing, we use the deciBel, where each deciBel is 1/10 of a Bel. this is abbreviated dB.
some of the damages to the ear are bad. Some are good, and some are ok.We use a decibel scale to find this information out. A decibel scale is a scale that shows you the amount of damage something can do to your ear. An example of a decibel scale would be.....loud music = 120dban infection = 90dbsports = 80dbhole in the ear drum = 100dbblows to the head = 50dbsmall bone problems = 40dbfalls or wax = 30dba jet - airplane = 140db150 is the highest or worst db you can get.And 0 db is the lowest or least worst.0-70 are minor problems.70-150 are major problems caused.
ten
The decibel (dB) scale is logarithmic. An increase of power by a factor of 10 is an increase of +10 dB. If power increases by a factor of 100, that is equivalent to +20 dB.The decibel (dB) scale is logarithmic. An increase of power by a factor of 10 is an increase of +10 dB. If power increases by a factor of 100, that is equivalent to +20 dB.The decibel (dB) scale is logarithmic. An increase of power by a factor of 10 is an increase of +10 dB. If power increases by a factor of 100, that is equivalent to +20 dB.The decibel (dB) scale is logarithmic. An increase of power by a factor of 10 is an increase of +10 dB. If power increases by a factor of 100, that is equivalent to +20 dB.
A bar chart can provide a visual representation of the loudness in dB for activities such as concerts, traffic noise, and normal conversation. Each activity can be represented by a labeled bar with corresponding dB levels on the y-axis, giving a clear comparison of their loudness levels. This chart helps easily understand the differences in loudness between various activities.
Take a sound pressure level meter (SPL meter). Try to measure the sound pressure p in pascals or in decibels, referred to the threshold of hearing with 20 micropascals.