The power SNR of an imaging system is 4 dB. The dominating noise in this system is white noise with average power of 4 mW. Calculate the average power of the signal.

10.0 mW

Explanation:

By definition, the SNR of any system is expressed as follows:

where

S = average power of the signal

N= average noise power

In this case this relationship can be written as follows, repalcing by the givens:

Rearranging terms, and taking log₁₀ on both sides, we have:

⇒ Pavg = 10 mW