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dB = 20*Log(p1/p2) I need to solve for p1 what is the formula?

 Oct 21, 2015

Best Answer 

 #2
avatar+26387 
+30

dB = 20*Log(p1/p2) I need to solve for p1 what is the formula?

 

\(\begin{array}{rcll} dB &=& 20\cdot \log{ \left( \frac{p_1}{p_2} \right) }\\\\ dB &=& \log{ [ \left( \frac{p_1}{p_2} \right)^{20} ] } \qquad &| \qquad 10^{()}\\\\ 10^{dB} &=&10^{ \log{ [ \left( \frac{p_1}{p_2} \right)^{20} ] } } \\\\ 10^{dB} &=& \left( \frac{p_1}{p_2} \right)^{20} \qquad &| \qquad 1^{\frac{1}{20}}\\\\ 10^{\frac{dB}{20}} &=& \frac{p_1}{p_2} \qquad &| \qquad \cdot p_2 \\\\ p_2\cdot 10^{\frac{dB}{20}} &=& p_1\\\\ \boxed{~ \mathbf{ p_1 } \mathbf{=} \mathbf{p_2\cdot 10^{\frac{dB}{20}} } ~}\\\\ \end{array}\)

laugh

 Oct 22, 2015
edited by heureka  Oct 22, 2015
edited by heureka  Oct 22, 2015
edited by heureka  Oct 22, 2015
edited by heureka  Oct 22, 2015
edited by heureka  Oct 22, 2015
edited by heureka  Oct 22, 2015
 #1
avatar+6251 
+5

\(dB = 20 \log\left(\dfrac {p_1}{p_2}\right) \\ \dfrac {dB}{20} = \log\left(\dfrac {p_1}{p_2}\right) \\ \dfrac {dB}{20} = \log(p_1)-\log(p_2) \\ \log(p_1) = \dfrac {dB}{20} + \log(p_2) \\ p_1 = 10^{\left( \frac {dB}{20} + \log(p_2)\right)}\)

.
 Oct 22, 2015
 #2
avatar+26387 
+30
Best Answer

dB = 20*Log(p1/p2) I need to solve for p1 what is the formula?

 

\(\begin{array}{rcll} dB &=& 20\cdot \log{ \left( \frac{p_1}{p_2} \right) }\\\\ dB &=& \log{ [ \left( \frac{p_1}{p_2} \right)^{20} ] } \qquad &| \qquad 10^{()}\\\\ 10^{dB} &=&10^{ \log{ [ \left( \frac{p_1}{p_2} \right)^{20} ] } } \\\\ 10^{dB} &=& \left( \frac{p_1}{p_2} \right)^{20} \qquad &| \qquad 1^{\frac{1}{20}}\\\\ 10^{\frac{dB}{20}} &=& \frac{p_1}{p_2} \qquad &| \qquad \cdot p_2 \\\\ p_2\cdot 10^{\frac{dB}{20}} &=& p_1\\\\ \boxed{~ \mathbf{ p_1 } \mathbf{=} \mathbf{p_2\cdot 10^{\frac{dB}{20}} } ~}\\\\ \end{array}\)

laugh

heureka Oct 22, 2015
edited by heureka  Oct 22, 2015
edited by heureka  Oct 22, 2015
edited by heureka  Oct 22, 2015
edited by heureka  Oct 22, 2015
edited by heureka  Oct 22, 2015
edited by heureka  Oct 22, 2015

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