5.30 Decibels Engineers often measure the ratio of two power measurements in dec

Question

5.30 Decibels Engineers often measure the ratio of two power measurements in decibels, or dB. The equation for the ratio of two power measurements in decibels is P. dB = 10 log,0P, (5.20) where P, is the power level being measured, and P, is some reference power level. Assume that the reference power level P, is I watt, and write a pro- gram that calculates the decibel level corresponding to power levels be- tween 1 and 20 watts, in 0.5 W steps. Plot the dB-versus-power curve on a log-linear scale.

Explanation / Answer

P1 = 1;
P2 = 1 : .5 : 20;
dB = 10 * log10(P2 / P1);
semilogx(P2, dB)
xlabel('P_2'); legend('10log(P_2 / P_1)'); grid on

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