6. A speech encoding apparatus as claimed in claim 5, wherein: said analysis means generates said pitch track data in a plurality of frames of data for each syllable; and said comparison means further includes first recomparison means for comparing said pitch track data omitting the first frame of data for each syllable with each of said pitch patterns and generating a measure of similarity, and second recomparison means for comparing said pitch track data omitting the last frame of data for each syllable with each of said pitch patterns and generating a measure of similarity.
6. A speech encoding apparatus as claimed in claim 5, wherein: said analysis means generates said pitch track data in a plurality of frames of data for each syllable; and said comparison means further includes first recomparison means for comparing said pitch track data omitting the first frame of data for each syllable with each of said pitch patterns and generating a measure of similarity, and second recomparison means for comparing said pitch track data omitting the last frame of data for each syllable with each of said pitch patterns and generating a measure of similarity. 7. A speech encoding apparatus as claimed in claim 6, wherein: said comparison means further includes third recomparison means for comparing said pitch track data omitting the first and last frames of data for each syllable with each of said pitch patterns and generating a measure of similarity.