Skip to main content

Trinity College Dublin, The University of Dublin

Trinity Menu Trinity Search

You are here About > Centre for Language & Communication Studies > Phonetics and Speech Laboratory

Phonetics and Speech Laboratory

Established in 1979, the Phonetics and Speech Lab provides for research and teaching that bridges experimental phonetics and phonology from a linguistics perspective and more engineering based approaches to speech modelling. It participates in a number of international research projects, and has collaborative links with many speech laboratories in Europe and beyond. There is a particular interest in research on Irish, but aspects of Hiberno-English and of many languages have also been investigated.


Group Photo
Back row: Liam, Andy, Irena, Anna, Christoph, Maria, Connor, John, Kate, Ornait.
Front row: Antoin, Harald, Ailbhe, Neasa, Christer, Emily.

Research strands

Research for student dissertations may be undertaken in a variety of theoretical and descriptive areas. Major research areas of the Laboratory and related research projects are listed below.

ABAIR: text-to-speech synthesis system for Irish

Project webpage:
The current project ABAIR, funded by the Department of Culture, Heritage and the Gaeltacht, enables the ABAIR team to continue developing state-of-the-art synthesis systems featuring all three major dialects of Irish.

  • Developing text-to-speech for Irish
  • Irish corpora for text-to-speech
  • Voice quality and the naturalness of synthetic speech
  • Other relevant past projects: CABÓGAÍ II, CABÓIGÍN 1, WISPR, CABÓG, Interaction of voice quality and f0, SPACT, VOX

Speech and Language Technology-based Educational Applications

  • Computer-Assisted Language Learning: exploring the benefits of text-to-speech synthesis in educational contexts
  • Design, development, implementation, and evaluation of game-based immersive environments
  • Working towards dialogue-based communicative language learning applications
  • Phonological awareness and early literacy assessment/screening for Irish

Speech and Language Technology-based Accessibility Applications

  • Development of screenreaders for the visually impaired using ABAIR multidialect synthesis
  • ABAIR web reader for Irish
  • Dialect-specific multimedia textbook development
  • Implementation of Liblouis Braille reader
  • See for more information

Voice source and voice quality analysis

See projects: CNGL, FastNet, COST 2103

  • Developing techniques for source filter decomposition
  • Analysis of voice source
  • Linguistic aspects of voice source variation: production studies
  • Tone of voice and the communication of emotion, mood, attitude: synthesis based perception studies
  • Other relevant past projects: Interaction of voice quality and f0, SPACT SPEECHMAPS, VOX, VERIVOX, HUMAINE


See projects: Prosody of Irish Dialects

  • Analysis of intonation of the three main dialects of Irish
  • How intonation and voice quality interact in prosody
  • Linguistic and paralinguistic functions of prosody
  • Analysis of intonation and voice quality in varieties of Irish English
  • Other relevant projects: Interaction of voice quality and f0

Articulatory/acoustic/aerodynamic analysis

See past project: ACCOR

  • Coarticulation and connected speech processes
  • Primary and secondary articulation of the Irish consonants
  • Articulatory database: Irish consonants
  • Development of software for combined analysis of EPG, EMMA, acoustid and aerodynamic signals
  • Other relevant past projects: ACCOR II and COST

Back to top

Projects and collaborations

Principal investigators: Ailbhe Ní Chasaide and Christer Gobl.


    Text-to-Speech (TTS) for Irish 
    Irish synthesis available at: 
    Funded by: the Department of Culture, Heritage and the Gaeltacht

    Text-to-Speech (TTS) for Irish
    Irish synthesis available at:
    Funded by: Foras na Gaeilge
  • Prosody of Irish Dialects
    The use of intonation, rhythm, voice quality for linguistic and paralinguistic signalling
    Previously funded by: Irish Research Council for the Humanities and Social Sciences (IRCHSS)
  • CabairE
    For those learning to read and those who have trouble reading, we are currently developing CabairE, a literacy training tool. CabairE will highlight words and phrases as they are being read out. Users can control the speech tempo, they can have single words or phrases repeated and can magnify the text as needed.

Back to top

  • Voice parameterisation and analysis of linguistically relevant voice source variation. The research is part of a large national collaboration aiming at personalised multilingual access and customer care.
    Web site:

  • Web site:
    Human-Machine Interaction Network on Emotion
    Funded by: EU, Sixth Framework Programme

  • WISPR (2003-2005)
    Welsh and Irish Speech Processing Resources
    Funded by: EU INTERREG IIIA Community Initiative Programme
  • FOCAIL (2002-2003)
    Foclóir Canúna Il-mheánach: towards a multi-media electronic pronunciation dictionary of Irish Dialects
    Funded by: Foras na Gaeilge
  • COST 258 (1997-2001)
    The naturalness of synthetic speech
    EU funded COST action
  • SPACT 1 and 2 (1995-1998)
    Application of speech recognition/synthesis technology in the MIR space station.
    Funded by the European Space Agency, project no. 11695/95/NL/JE.
  • VERIVOX (1997-1998)
    Voice variability in speaker verification.
    EU funded LTR working group under RTD programme in Information Technologies, Project No. 22760.
  • CABÓG (1993-1996)
    A development system for Irish text-to-speech conversion.
    Project funded by ACCUTRON, Limerick and the Irish-American Foundation.
  • SPEECH MAPS (1992-1995)
    Sound-to-gesture inversion in speech.
    EU funded ESPRIT/BRA project, No. 6975.
  • VOX (1992-1995)
    The analysis and synthesis of speaker characteristics.
    EU funded ESPRIT/BRA working group, No. 6298.
  • ACCOR I and II (1989-1992, 1992-1995)
    Articulatory-acoustic correlations in coarticulation
    EU funded ESPRIT/BRA project, No. 3279; EU funded ESPRIT/BRA working group, No. 7098.
  • Back to top


    Courses are taught at undergraduate and postgraduate levels.

    Undergraduate courses

    • LII11003 Introduction to Phonetics and Phonology
    • LI2035 Speech Science and Phonetics
    • LI4031 Speech Analysis and Synthesis
    • SLU22001 Phonetics and Phonologyy
    • LIU11003 Phonetics and Phonology
    • BCLING2 Language and the Mind

    Postgraduate courses

    • LI 7874 Speech Production, Hearing, and Perception
    • LI 7867 Laboratory Phonetics and Phonology
    • LIP12003 Experimental Analysis of Sound Systems
    • LI 7871 Speech Processing 1: spectral analysis
    • LI 7875 Speech Processing 2: acoustic modelling
    • LI 7868 Describing the Sounds of Languages
    • LI7894 An Ghaeilge mar Mheán Teagaisc [Irish as a medium of Instruction]
    • LI7895 Computer-Assisted Language Learning: Design, Implementation and Evaluation
    • LI7897 Speech and Language Technology in Education

    Back to top


    • Semi anechoic chamber
    • Network of PCs using windows and linux
    • Software systems (developed at CLCS) for source-filter decomposition: inverse filtering and voice source model matching
    • Multichannel system for simultaneous recording of articulatory, aerodynamic and acoustic signals
    • In house software system for EMMA and EPG analysis
    • Multispeech and CSL
    • SWELL, Matlab, Alladin and various speech analysis packages
    • Gaeltec aerodynamic system (flow and pressure measurement)
    • Electropalatography (EPG)
    • Movetrack
    • Photo electroglottograph (PEG)
    • Pitchmeter

    Back to top