Author Topic: how to add dB (decibels)  (Read 2032 times)

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how to add dB (decibels)
« on: July 02, 2009, 01:38:39 PM »
It took me awhile to figure this out, so figured it'd be useful for someone if I posted this.

I was trying to figure out how to add decibel values, such as 5dB and -25dB. Decibels operate on the log scale with an arbitrary reference zero point so they can't just be added through simple addition.

let a=5 and b=-25

the equation is 10*log(10^a+10^b)

I'm summing rf signal attenuation caused by multiple successive mediums. These pages helped me:




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