6. A method for producing subunit speech patterns according to claim 5 wherein the step of producing an utterance time frame signal corresponding to the reference speech pattern subunit endframe comprises determining the time of occurrence of the reference speech pattern subunit endframe in the sequence of reference speech pattern time frames responsive to said second signal, and selecting the utterance time frame corresponding to the best time alignment at said time of occurrence responsive to the best matching time frame path signals.
6. A method for producing subunit speech patterns according to claim 5 wherein the step of producing an utterance time frame signal corresponding to the reference speech pattern subunit endframe comprises determining the time of occurrence of the reference speech pattern subunit endframe in the sequence of reference speech pattern time frames responsive to said second signal, and selecting the utterance time frame corresponding to the best time alignment at said time of occurrence responsive to the best matching time frame path signals. 8. A method for producing subunit speech patterns according to claim 6 wherein the utterance modifying step comprises generating a scale factor signal representative of the ratio of the number of frames in the utterance to the number of frames in the reference speech pattern, and wherein the step of selecting the utterance time frame having the best time alignment with the determined reference speech pattern subunit endframe comprises detecting the modified utterance time frame corresponding to said determined reference speech pattern subunit endframe responsive to said best matching time frame path signals, and multiplying the detected modified utterance endframe signal by said scale factor signal.