4. The apparatus recited in claim 3 wherein each phoneme recognizer includes a high-activation filter prior to the principle component analysis processor for retaining category specific data points conjectured to be robust toward undesirable interference or noise.
3. The apparatus recited in claim 1 wherein each phoneme recognizer comprises: a low variance filter for retaining category-specific data points conjectured to encode the most relevant cognitive information pertaining to the corresponding category, and; a principle component analysis processor for selecting and reducing dimensions of the filter output to a feature vector.