- published: 23 Feb 2012
- views: 18725
The neper is a logarithmic unit for ratios of measurements of physical field and power quantities, such as gain and loss of electronic signals. It has the unit symbol Np. The unit's name is derived from the name of John Napier, the inventor of logarithms. As is the case for the decibel and bel, the neper is not a unit in the International System of Units (SI), but it is accepted for use alongside the SI.
Like the decibel, the neper is a unit in a logarithmic scale. While the bel uses the decadic (base-10) logarithm to compute ratios, the neper uses the natural logarithm, based on Euler's number (e ≈2.71828). The value of a ratio in nepers is given by
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The neper is defined in terms of ratios of field quantities (for example, voltage or current amplitudes in electrical circuits, or pressure in acoustics), whereas the decibel was originally defined in terms of power ratios. A power ratio 10log(ratio) dB is equivalent to a field-quantity ratio 20log(ratio) dB, since power is proportional to the square (Joule's laws) of the amplitude. Hence the neper and dB are related via:
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Stupcat Humor 2016 - Historia neper bira
I...sit on the stairs...got time on my hands
...have nowhere to go...feelin' good and I know...
Whatever you do don't make me come down...
Don't make me come down...
You will have trouble...
Why...do you hurt me...i'm such a nice guy
Put a knife in my heart...then turn it around
You laugh while I bleed...as I bleed to death...
If I bleed to death...you've got trouble...
(chorus)
Hit me again and I'll spit in your face...
Love me again and I'll cut you right back...
Smile at me and I'll Frown at you...
You will be in trouble....
I'm feeling alone...I pick up the phone...
when nobody's home...I need to go out
I'm runnin' the streets...no shirt on my back
no shirt on my back...lookin for trouble...
Hit me again and I'll spit in your face...
Love me again and I'll cut you right back...
Smile at me and I'll frown at you...
You will be in trouble...
I'm...coming to you...I wanna make love....
You're not in the mood...so I leave you alone...
I'll get magazines...go play with myself...
go play with myself...go play with trouble
I've got a disease...It's inside my head...
so I go to bed...to whom it concerns...
I haven't a clue...I haven't a clue...
well maybe it's you...givin' me trouble
(chorus twice)
Hit me again and I'll....etc...