ZuoMin: The useage of dB

Giving a power (P), the definition of dB is:

$dB(P) = 10log_{10}P$

Why shall we making the definition like this?
Let us exam some example:

$dB(2) =dB(2\times 10^{0})=3$

$dB(20) =dB(2\times 10^{1})=13$

$dB(200) =dB(2\times 10^{2})=23$

$dB(2000) =dB(2\times 10^{3})=33$

From the example above, we can found that dB is very close to the scientific notation.
The coefficient part of the scientific notation is refer to the unit of dB.
The exponent part of the scientific notation is refer to the number of dB above tens.

Therefore, the number covers different scale can be expressed simply in scientific notation as well as dB

ZuoMin

2011年11月7日星期一

The useage of dB

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張貼留言

2011年11月7日 星期一

The useage of dB

沒有留言:

張貼留言

2011年11月7日星期一