12. A method for recognizing a speech pattern as a string of predetermined reference words according to claim 11 further characterized in that said time registering comprises: restricting the range of time registration starting frames for the current level responsive to the time registration speech segment endframes of the immediately preceding level; and storing for each time registration speech segment endframe the best correspondence signal for said endframe, a signal representative of the best correspondence signal reference word for said endframe, and a signal representative of the time registration speech pattern starting frame corresponding to the best reference word for said endframe.
12. A method for recognizing a speech pattern as a string of predetermined reference words according to claim 11 further characterized in that said time registering comprises: restricting the range of time registration starting frames for the current level responsive to the time registration speech segment endframes of the immediately preceding level; and storing for each time registration speech segment endframe the best correspondence signal for said endframe, a signal representative of the best correspondence signal reference word for said endframe, and a signal representative of the time registration speech pattern starting frame corresponding to the best reference word for said endframe. 13. A method for recognizing a speech pattern as a string of predetermined reference words according to claim 12 further characterized in that the restriction of said level starting frames comprises: detecting the minimum of the preceding level best correspondence signals responsive to the time registration best correspondence signals of the preceding level, and selecting time registration speech segment starting frames for the current level responsive to the best correspondence signals of the preceding level and the detected minimum best correspondence signal of the preceding level.