1. A computer-readable medium storing instructions for controlling a computing device to process phonemes for use in recognizing a received phoneme having an associated received-signal vector using a stored plurality of phoneme classes, each of the plurality of phoneme classes comprising class phonemes, the instructions comprising, for each class phoneme: generating an expanded stored-phoneme vector from the class phoneme; and transforming the expanded stored-phoneme vector into an orthogonal form associated with a hypersphere having a center and a radius, wherein a received phoneme may be recognized by generating an expanded received-signal vector into an orthogonal form for analysis in the hypersphere.