The sensitivity of a receiver is normally taken as the minimum input signal (S
min) required to produce an output signal with a specific signal-to-noise (S/N) ratio. S/N is a
required minimum ratio, if N is increased, then S must also be increased to maintain the S/N ratio. The threshold value is chosen high enough above the mean noise level so that the probability of random noise peaks exceeding the threshold, and causing false alarms, is acceptably low. It is defined (in log domain/dB) as
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