本稿では日本漢字音の音節內部における音素配列について、歷史的觀點から調査を行った。 12世紀中頃において、論理的に結合可能な音節の種類は742、そのうち漢字音として實際に使用されている 音節の種類は400である。使用率(結合可能な音節數に對する、實際に使用されている音節の割合)は54%であった。現代語において、論理的に結合可能な音節の種類は474、そのうち漢字音として使用されている音節の種類は295で、使用率は62%であった。したがって、音素成員の削減も含めた音素配列上の規則の變化によって、105音節が現代語までに區別されなくなったことになる。 外的要因によって成立した日本漢字音の音韻體系は、和語の音韻體系に比して、成員が多く、あきまの多い體系であった。現代語に變化していく過程で起こった成員の統合·削減は、結果としてそのあきまを埋める動きをしている。 一方で、連母音の長音化によるオ段長音の增加は、例えば/eJ/や/aR/などの新たなあきまを生み出したが、全體としては區別する音節數を縮小しながら、あきまを少なくしてきたと言える。
A high percentage of Japanese language words-particularly nouns-are Sino-Japanese. The simplicity of the phonotactics that construct Sino-Japanese morphemes has been pointed out by many scholars heretofore. This paper considers from a historical perspective the syllable phonotactics that construct Sino-Japanese morphemes. In the mid-12th century, there were 742 theoretically combinable syllables, 400 of which were actually used as Sino-Japanese. The usage rate (the ratio of actually used syllables to the number of combinable ones) was 54%. In the contemporary Japanese language, there are 474 theoretically combinable syllables, 295 of which are used as Sino-Japanese. The usage rate is 62%. This means that 105 syllables have come to be no longer distinguished between due to phonotactic rule changes, including a reduction in the number of phoneme members. The Sino-Japanese phonetic system, which came into existence based on external factors, has many members and distribution holes compared to the native Japanese one. The combining of and reduction in phoneme members that occurred in the process of the contemporary Japanese language emerging has functioned to fill these distribution holes. On the other hand, while the increase in the long "o" due to the lengthening of sequential vowels has given rise to, for example, new distribution holes such as /eJ/ and /aR/; overall it has reduced the number of them while lessening the number of syllables that are distinguished between.wed as that the "ability for culture education" was a requirement of a NT and was particularly important in TT.
