@article{pittayaporn-etal-2026-chulalongkorn,
    title = "The Chulalongkorn Corpus of Spoken {T}hai ({CCOST})",
    author = "Pittayaporn, Pittayawat  and
      Yang, Cathryn  and
      Jitwiriyanont, Sujinat  and
      Kirby, James",
    editor = "Piperidis, Stelios  and
      Bel, N{\'u}ria  and
      van den Heuvel, Henk  and
      Ide, Nancy  and
      Krek, Simon  and
      Toral, Antonio",
    journal = "International Conference on Language Resources and Evaluation",
    volume = "main",
    month = may,
    year = "2026",
    address = "Palma de Mallorca, Spain",
    publisher = "ELRA Language Resource Association",
    url = "https://preview.aclanthology.org/ingest-lrec/2026.lrec-main.247/",
    pages = "3154--3160",
    abstract = "The Chulalongkorn Corpus of Spoken Thai (CCOST) is a phonetically annotated corpus of Standard Thai. The corpus comprises approximately 7 hours of interview-style spontaneous speech from 49 speakers (19 male, 30 female) ranging in age from 18 to 83 years old. Speakers represent diverse regional backgrounds across Thailand but were instructed to speak in Standard Thai. Each speaker also read a 206-item monosyllabic word list twice and a set of 25 sentences three times. The annotation pipeline combines automatic speech recognition (ASR) and forced alignment using CLARIN-D{'}s OCTRA and Munich Automatic Segmentation System (MAUS) tools with manual correction by phonetically trained native Thai speakers. Transcriptions include orthographic, word-level, syllable-level, and phone-level annotations including toneme labels. The corpus serves as a resource in the sociophonetic investigation of segmental and tonal variation in spontaneous and controlled speech, enabling examination of individual characteristics as well as group differences across age groups, genders, and regional backgrounds. Hand-corrected annotations will additionally serve to improve forced alignment accuracy for Standard Thai."
}