A method and apparatus for speaker recognition is provided that matches
the noise in training data to noise in testing data using spectral
addition. Under spectral addition, the mean and variance for a plurality
of frequency components are adjusted in the training data and the test
data so that each mean and variance is matched in a resulting matched
training signal and matched test signal. The adjustments made to the
training data and test data add to the mean and variance of the training
data and test data instead of subtracting from the mean and variance.