CALL-SLT: A Spoken CALL System based on grammar and speech recognition

Manny Rayner, Nikos Tsourakis, Claudia Baur, Pierrette Bouillon, Johanna Gerlach

Abstract


We describe CALL-SLT, a speech-enabled Computer-Assisted Language
Learning application where the central idea is to prompt the student
with an abstract representation of what they are supposed to say, and
then use a combination of grammar-based speech recognition and
rule-based translation to rate their response. The system has been
developed to the level of a mature prototype, freely deployed on the
web, with versions for several languages. We present an overview of
the core system architecture and the various types of content we have
developed. Finally, we describe several evaluations, the last of which
is a study carried out over about a week using 130 subjects recruited
through the Amazon Mechanical Turk, in which CALL-SLT was contrasted
against a control version where the speech recognition component was
disabled. The improvement in student learning performance between the
two groups was significant at p < 0.02.


Keywords


CALL, speech, grammar, evaluation

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References


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