Mandarin Corpus Research Articles

Genetic algorithm for the efficient selection of disyllabic word lists used in Mandarin speech discrimination tests

Speech audiometric tests have been widely used for advanced hearing diagnoses and in rehabilitation. However, there are no standardised speech tests for more than 90% of the world's population, who do not speak English. A major problem in the design of a speech audiometric test is that the selection of test materials is subject to multiple criteria, and its complexity rises dramatically as the structure of test items changes from phonemic or monosyllabic forms to disyllabic or polysyllabic forms. A genetic algorithm is presented that can automatically select a set of disyllabic words from a large Mandarin corpus. The selection accords with the following principal criteria for the items constituting a speech discrimination test: similarity in structure, familiarity to the subjects, and a phonemically balanced composition. The performance of the genetic algorithm was evaluated by computation of the distance between a target vector, specifying the desired distribution of initial and final syllables and tone patterns for daily disyllabic word usage, and the vector derived by the search results of the algorithm. The use of the genetic algorithm was illustrated by its application to the selection of test lists from two Mandarin corpora. The results showed that, for a given corpus, at least 12 disyllabic word lists with a distance of less than 20 could be generated within 72 h. The genetic algorithm performed an efficient, robust and low-complexity search of the problem space and can be easily modified to adapt to the material selection of other languages.

Monosyllabic word merger in Mandarin

Spoken language reduction in spontaneous speech constitutes an important part of the process of language change. Utilizing a Mandarin corpus, this article examines monosyllabic word merger with pronouns in the first syllable position. The shortened form marks a respective vocalic or consonantal element stemming from the source syllables. This article proposes that there exists a target syllable for a pair of monosyllabic words, but it is not unique. Depending on the syllable structure of the source syllables, different lines of developments of target syllables are possible. When the combination of the source syllables allows a development into a well-formed Mandarin syllable, the output is a good candidate for a coalescent compound. Furthermore, when the immediately neighboring vocalic parts constitute a front-back contrast or they are identical, it is likely that word merger is produced. Durational results also show that a monosyllabic word merger is usually longer than a single syllable.The author would like to thank the reviewers of the journal Language Variation and Change and two of my colleagues, Professor Ying-chin Lin and Professor Jackson T.-S. Sun, for their constructive comments. The study presented in this article was financially supported by the National Science Council, grant NSC-92-2411-H-001-075 and by the Ministry of Education, grant 91-E-FA06-4-4.