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The aim of this study is to select and formulate criteria for the assessment of tools and exercises that are using computer-assisted pronunciation training (CAPT). We examined ten different CAPT tools selected on the basis of an informal questionnaire among 10 colleagues working in a German-French CAPT project. Although the applied assessment must still be regarded as informal, and although the selected CAPT tools might not be an optimal sample for representing the state of the art, the results clearly show that there is a lot to improve regarding the clarity of instruction, the quality of exercises, the robustness of the diagnosis, the clarity and appropriateness of scoring, the diversity of feedback methods, the assumed benefit for various types of users as well as the usage of ASR. Despite various good approaches regarding graphics and game-like exercises there are obviously missing links between the pedagogical expertise in phonetic training on the one hand, and software development including usability engineering on the other.
The IFCASL corpus is a French-German bilingual phonetic learner corpus designed, recorded and annotated in a project on individualized feedback in computer-assisted spoken language learning. The motivation for setting up this corpus was that there is no phonetically annotated and segmented corpus for this language pair of comparable of size and coverage. In contrast to most learner corpora, the IFCASL corpus incorporate data for a language pair in both directions, i.e. in our case French learners of German, and German learners of French. In addition, the corpus is complemented by two sub-corpora of native speech by the same speakers. The corpus provides spoken data by about 100 speakers with comparable productions, annotated and segmented on the word and the phone level, with more than 50% manually corrected data. The paper reports on inter-annotator agreement and the optimization of the acoustic models for forced speech-text alignment in exercises for computer-assisted pronunciation training. Example studies based on the corpus data with a phonetic focus include topics such as the realization of /h/ and glottal stop, final devoicing of obstruents, vowel quantity and quality, pitch range, and tempo.