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A Model for Multimodal Dialogue System Output Applied to an Animated Talking Head
KTH, School of Computer Science and Communication (CSC), Centres, Centre for Speech Technology, CTT. KTH, School of Computer Science and Communication (CSC), Speech, Music and Hearing, TMH, Speech Communication and Technology.ORCID iD: 0000-0003-1399-6604
KTH, School of Computer Science and Communication (CSC), Centres, Centre for Speech Technology, CTT. KTH, School of Computer Science and Communication (CSC), Speech, Music and Hearing, TMH, Speech Communication and Technology.ORCID iD: 0000-0001-9327-9482
KTH, School of Computer Science and Communication (CSC), Centres, Centre for Speech Technology, CTT.
2005 (English)In: SPOKEN MULTIMODAL HUMAN-COMPUTER DIALOGUE IN MOBILE ENVIRONMENTS / [ed] Minker, Wolfgang; Bühler, Dirk; Dybkjær, Laila, Dordrecht: Springer , 2005, 93-113 p.Chapter in book (Refereed)
Abstract [en]

We present a formalism for specifying verbal and non-verbal output from a multimodal dialogue system. The output specification is XML-based and provides information about communicative functions of the output, without detailing the realisation of these functions. The aim is to let dialogue systems generate the same output for a wide variety of output devices and modalities. The formalism was developed and implemented in the multimodal spoken dialogue system AdApt. We also describe how facial gestures in the 3D-animated talking head used within this system are controlled through the formalism.

Place, publisher, year, edition, pages
Dordrecht: Springer , 2005. 93-113 p.
, Text Speech and Language Technology, ISSN 1386-291X ; 28
Keyword [en]
GESOM, AdApt, Standards, XML, 3D-animation, Gesture, Turn-taking, Lip synchronisation
National Category
Computer and Information Science General Language Studies and Linguistics
URN: urn:nbn:se:kth:diva-12751DOI: 10.1007/1-4020-3075-4_6ISI: 000270447900008ISBN: 978-1-4020-3075-8OAI: diva2:318657
QC 20100510 ISCA Tutorial and Research Workshop on Multi-Modal Dialogue in Mobile Environments, Kloster Irsee, GERMANY, 2002Available from: 2010-05-10 Created: 2010-05-10 Last updated: 2011-10-13Bibliographically approved
In thesis
1. Talking Heads - Models and Applications for Multimodal Speech Synthesis
Open this publication in new window or tab >>Talking Heads - Models and Applications for Multimodal Speech Synthesis
2003 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis presents work in the area of computer-animatedtalking heads. A system for multimodal speech synthesis hasbeen developed, capable of generating audiovisual speechanimations from arbitrary text, using parametrically controlled3D models of the face and head. A speech-specific directparameterisation of the movement of the visible articulators(lips, tongue and jaw) is suggested, along with a flexiblescheme for parameterising facial surface deformations based onwell-defined articulatory targets.

To improve the realism and validity of facial and intra-oralspeech movements, measurements from real speakers have beenincorporated from several types of static and dynamic datasources. These include ultrasound measurements of tonguesurface shape, dynamic optical motion tracking of face pointsin 3D, as well as electromagnetic articulography (EMA)providing dynamic tongue movement data in 2D. Ultrasound dataare used to estimate target configurations for a complex tonguemodel for a number of sustained articulations. Simultaneousoptical and electromagnetic measurements are performed and thedata are used to resynthesise facial and intra-oralarticulation in the model. A robust resynthesis procedure,capable of animating facial geometries that differ in shapefrom the measured subject, is described.

To drive articulation from symbolic (phonetic) input, forexample in the context of a text-to-speech system, bothrule-based and data-driven articulatory control models havebeen developed. The rule-based model effectively handlesforward and backward coarticulation by targetunder-specification, while the data-driven model uses ANNs toestimate articulatory parameter trajectories, trained ontrajectories resynthesised from optical measurements. Thearticulatory control models are evaluated and compared againstother data-driven models trained on the same data. Experimentswith ANNs for driving the articulation of a talking headdirectly from acoustic speech input are also reported.

A flexible strategy for generation of non-verbal facialgestures is presented. It is based on a gesture libraryorganised by communicative function, where each function hasmultiple alternative realisations. The gestures can be used tosignal e.g. turn-taking, back-channelling and prominence whenthe talking head is employed as output channel in a spokendialogue system. A device independent XML-based formalism fornon-verbal and verbal output in multimodal dialogue systems isproposed, and it is described how the output specification isinterpreted in the context of a talking head and converted intofacial animation using the gesture library.

Through a series of audiovisual perceptual experiments withnoise-degraded audio, it is demonstrated that the animatedtalking head provides significantly increased intelligibilityover the audio-only case, in some cases not significantly belowthat provided by a natural face.

Finally, several projects and applications are presented,where the described talking head technology has beensuccessfully employed. Four different multimodal spokendialogue systems are outlined, and the role of the talkingheads in each of the systems is discussed. A telecommunicationapplication where the talking head functions as an aid forhearing-impaired users is also described, as well as a speechtraining application where talking heads and languagetechnology are used with the purpose of improving speechproduction in profoundly deaf children.

Place, publisher, year, edition, pages
Institutionen för talöverföring och musikakustik, 2003. viii, 63 p.
Trita-TMH, 2003:7
Talking heads, facial animation, speech synthesis, coarticulation, intelligibility, embodied conversational agents
urn:nbn:se:kth:diva-3561 (URN)91-7283-536-2 (ISBN)
Public defence
2003-06-11, 00:00 (English)
QC 20100506Available from: 2003-06-26 Created: 2003-06-26 Last updated: 2010-05-11Bibliographically approved

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