ln() vs. log()
|
05-13-2022, 10:38 PM
Post: #27
|
|||
|
|||
RE: ln() vs. log()
Actually, Bel is the original unit and the power of signal S, measured in Bel is
log (S / Sref) [using base-10 log] As this unit was not convenient enough, a smaller unit became more popular. It is the deci Bel, which is a tenth part of a Bel. Hence the symbol is dB, with a lower case d and an upper case B. As the unit is the tenth part of the Bel, a 10-times multiplier should be applied to the magnitude. So the power of signal S, measured in dB is 10 log (S / Sref) [using base-10 log] Bels and deciBels are intended to compare powerlike quantities. As the power of an electrical signal is related to the square of the voltage, V (or, for that matter, the square of the current, I), it is usually possible to state that the power of signal S, measured in dB is 20 log (V / Vref) or 20 log (I / Iref) [using base-10 log] However, this is valid only if the voltage (or current) of the signal and the reference are measured over the same impedance value. Otherwise, these formulas cannot be used. Please disregard any idiomatic or formatting mistake. (04-18-2016 01:25 PM)Tugdual Wrote: Also decibel is Andrés C. Rodríguez (Argentina) Please disregard idiomatic mistakes. My posts are mostly from old memories, not from current research. |
|||
« Next Oldest | Next Newest »
|
Messages In This Thread |
ln() vs. log() - Don Shepherd - 04-17-2016, 10:06 PM
RE: ln() vs. log() - Massimo Gnerucci - 04-17-2016, 10:15 PM
RE: ln() vs. log() - Han - 04-17-2016, 10:19 PM
RE: ln() vs. log() - Dave Shaffer - 04-17-2016, 11:50 PM
RE: ln() vs. log() - Tim Wessman - 04-18-2016, 01:37 AM
RE: ln() vs. log() - StephenG1CMZ - 04-25-2016, 03:59 PM
RE: ln() vs. log() - Katie Wasserman - 04-18-2016, 02:48 AM
RE: ln() vs. log() - Han - 04-18-2016, 03:05 AM
RE: ln() vs. log() - wojtek - 04-18-2016, 03:42 AM
RE: ln() vs. log() - Alejandro Paz(Germany) - 04-18-2016, 04:00 AM
RE: ln() vs. log() - Jeff_Kearns - 04-18-2016, 10:51 AM
RE: ln() vs. log() - Thomas Radtke - 04-18-2016, 01:14 PM
RE: ln() vs. log() - jebem - 04-19-2016, 02:00 PM
RE: ln() vs. log() - Dieter - 04-19-2016, 09:47 PM
RE: ln() vs. log() - Tugdual - 04-18-2016, 01:25 PM
RE: ln() vs. log() - emece67 - 04-18-2016, 02:41 PM
RE: ln() vs. log() - Andres - 05-13-2022 10:38 PM
RE: ln() vs. log() - Csaba Tizedes - 04-18-2016, 04:38 PM
RE: ln() vs. log() - Joe Horn - 04-19-2016, 05:33 AM
RE: ln() vs. log() - jebem - 04-19-2016, 12:48 PM
RE: ln() vs. log() - Csaba Tizedes - 04-20-2016, 07:33 AM
RE: ln() vs. log() - emece67 - 04-20-2016, 08:45 AM
RE: ln() vs. log() - emece67 - 04-20-2016, 10:23 AM
RE: ln() vs. log() - JurgenRo - 04-21-2016, 07:52 PM
RE: ln() vs. log() - Marcus von Cube - 04-24-2016, 02:38 PM
RE: ln() vs. log() - Dieter - 04-25-2016, 06:38 AM
RE: ln() vs. log() - Thomas Klemm - 05-13-2022, 11:15 AM
RE: ln() vs. log() - KeithB - 05-16-2022, 01:18 PM
|
User(s) browsing this thread: 1 Guest(s)