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In every pattern recognition problem there exist the need for variable and feature selection and, in many cases, feature generation. In pattern recognition, the term variable is usually understood as the raw measurements or raw values taken from the subjects to be classified, while the term feature is used to refer to the result of the transformations applied to the variables in order to transform them into another domain or space, in which a bigger discriminant capability of the new calculated features is expected; a very popular cases of feature generation are the use of principal component analysis (PCA), in which the variables are projected into a lower dimensional space in which the new features can be used to visualize the underlying class distributions in the original data [1], or the Fourier Transform, in which a few of its coefficients can represent new features [2], [3]. Sometimes, the literature does not make any distinction between variables and features, using them indistinctly [4], [5].

Optimal Feature Generation with Genetic Algorithms and FLDR in a Restricted-Vocabulary Speech Recognition System