Bel

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Bel

Bel (bāl, bĕl), deity of the Middle Eastern religions. The name is a cognate of that of Baal. For Bel in the Bible, see Bel and the Dragon.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Bel

the unit for a relative logarithmic quantity (the logarithm of the ratio between two physical quantities of the same name) that is used in electrical engineering, radio engineering, acoustics, and other branches of physics. It is designated by the letter B and is named after the American inventor of the telephone, A. G. Bell. The number of bels N, which corresponds to the ratio of two energy quantities P1 and P2 (which relate to power, energy, energy density, and so on), is expressed by the formula N = log (P1/P2); for “force” magnitudes F1 and F2 (voltage, current strength, pressure, field strength, and others), it is expressed as N = 2 log (F1/F2). The tenth part of a bel, called a decibel (dB), is usually used.

bel

[bel]
(physics)
A dimensionless unit expressing the ratio of two powers or intensities, or the ratio of a power to a reference power, such that the number of bels is the common logarithm of this ratio. Symbolized b; B.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

bel

A unit of sound level which denotes the ratio between two quantities proportional to power; the number of bels equals the logarithm of this ratio, to the base 10; 1 bel=10 decibels.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

bel

a unit for comparing two power levels, equal to the logarithm to the base ten of the ratio of the two powers.
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

bell character

The control code used to sound an audible bell or tone in order to alert the user (ASCII 7, EBCDIC 2F).

deciBel

A unit of measurement of the loudness or strength of a signal. One deciBel is considered the smallest difference in sound level that the human ear can discern. Created in the early days of telephony as a way to measure cable and equipment performance and named after Alexander Graham Bell, deciBels (dBs) are a relative measurement derived from two signal levels: a reference input level and an observed output level. A deciBel is the logarithm of the ratio of the two levels. One Bel is when the output signal is 10x that of the input, and one deciBel is 1/10th of a Bel.

Sound Levels
A whisper is about 20 dB. A normal conversation is typically from 60 to 70 dB, and a noisy factory from 90 to 100 dB. Loud thunder is approximately 110 dB, and 120 dB borders on the threshold of pain. In 1883, the volcano on the Indonesian island of Krakatoa erupted. A hundred miles away, the sound level reached more than 170 dB, deafening everyone who survived. See dBm.
```INCREASE IN POWER LEVELS (WATTS)Formula is dB=10*log(P1/P2)DeciBels   Output Signal Strength
3dB           2x
6dB           4x
10dB (1 Bel)  10x
20dB         100x
30dB       1,000x
40db      10,000x

ATTENUATION OF AMPLITUDE (VOLTS or AMPS)Formula is dB=20*log(A1/A2)DeciBels   Output Signal Strength
-3dB        0.707x
-6dB        0.5x
-10dB        0.316x
-20dB        0.1x
-30dB        0.032x
-40db        0.010x
```

Bels and Bells Quite a lot was named after Alexander Graham Bell. Throughout the 20th century, the Bell name was ubiquitous. It will live on with the deciBel.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
The heartbreaking announcement about her death, made by her family, said: "Our brave Belle sadly lost her fight and passed away peacefully on the 5th April.
Bible Belles is a multimedia publishing company dedicated to changing girls' lives through the female heroes of the Bible.
"The Belles are looking forward to their celebrations this year, competing in October and to another fantastic 25 years!
East Durham then threw on a third striker, but to no avail, the Belles keeper, Ash Trainer, pulling off some great saves.
The locations are interchangeable, but these vibrant Pascagoula memories are cherished by the 'Goula Belles.
Meanwhile Daniel has been ordered not to "dance the feet" off his belle at this year's festival.
"The Belles had a fantastic time working with staff and students from Caludon Castle school and really hope the single is a great success and the people of Coventry get right behind them."
In the final the Belles met the hosts in a repeat of last year's final.
The Belles's video application was judged against more than 1,000 other UK acts and was one of only three chosen for The Last Bandstanding event.
Belle then meets one of the castle's residents 6 Chip (Nathan Mack), a teacup.

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