Variable Norm Exponential Gain Estimation
, by William Gray

A multichannel norm ratio is presented which measures the distribution of exponentially gained seismograms as
a function of the gain constant. Minimization of the ratio yeilds an optimum gain constant for achieving a
uniform output distribution. Newton's method is used to minimize the general norm ratio. A Fibonacci search
method is used to minimize the ratio when the inputs are distributed as a double exponential and the outputs
are to be as uniform as possible.