Speaker independent isolated word automatic speech recognition using computer generated phonemes

A speaker independent isolated word speech recognition system is developed based on computer generated phonemes (CGP). A CGP is a vector of features that has been generated to represent a region of speech. The CGP creation algorithm looks for stable sounds in the incoming word through the use of a similarity measure. When a stable sound is detected a CGP is created to represent it. In addition to the creation of CGPs for stable vocal tract sounds, when unvoiced fricatives occur at either the beginning or end of a word a representative CGP is created. Using a heavily constrained dynamic time warping algorithm, the CGPs of the incoming word are then compared against reference templates, which consist of previously created strings of CGPs. The identity of the reference template which is closest in distance to the incoming test word is chosen as the estimate of the test word.