in this lecture i got to learn the accurate calculation of db ..
5major point of this lecture was-->
1: dB calculation Represent Large Ratios With Simple Numbers.
2: Decibels are logarithmic. They allow simple numbers to express values that would normally require many more digits.
3:
dBW + dBW = dBW
dW - dBW = dB
dBW + dB = dBW
dbW - dB = dBW
dBm + dBm = dBm
dBm - dBm = dB
dBM + dB = dBM
dbM - dB = dBM
4:
Power ratio to dB = 10log 10 (P)
dB to power ratio = 10 ^ (dB / 10)
5:
1 bel = 10 decibel
dB
is actually used in power level measurement for satellite
communication,telephone system, mobile system. That means signal to
noise ratio level to find out value decibel system can be used.