Annual Report 1999
Table of Contents
The Centre for Speech Technology (CTT) is created as a platform for co-operation
between industry and academic research within the strategically important area of speech technology. It was established
in April 1996 and is planned as a long-term enterprise, concentrating on fundamental research topics of industrial
relevance. CTT is a unit within the Department of Speech, Music and Hearing (TMH), controlled by a separate board.
In July, 1998, we entered the second stage of CTT, now jointly sponsored by KTH, NUTEK, and Swedish industry, represented
by 14 companies.
Speech technology will no doubt become an increasingly important area
within automated human machine services. The rapid development of the area during the last years has made this
even more evident. A main goal of CTT is to build on the internationally recognised speech technology expertise
at the Department of Speech, Music and Hearing at KTH and advance it for future applications in products and services.
The Centre will assure that Sweden stays in the forefront of speech technology research and that Swedish will be
extensively modelled for speech and language applications.
The strategy of CTT may be summarised in the following points:
- Pre-competitive long-term research is an essential task for the Centre.
It is a prerequisite for other work at the Centre and will secure the knowledge base needed for the more application-oriented
work pursued at the Centre.
- Participation in international projects is an important activity and
indispensable in order to maintain the CTT research network and to keep the Centre updated with the current international
- Co-operative work with Swedish industry for mutual knowledge transfer
is a fundamental activity within the Centre. The collaboration will also offer the Centre an understanding of current
industrial needs and trends. The developments of conversational systems are examples of such projects where many
aspects and demands have to be integrated.
- Development of multi-modal man-machine interfaces: voice-only systems,
that may be used over the telephone, and systems with graphical interfaces including talking 3D-animated agents.
The ultimate goal is to create adaptive systems, which for example adjust to the speaker, the listener, and the
- Building demonstrator applications that illustrate essential new aspects
of the speech technology and indicate new areas where they can be employed. Efficient language training based on
speech technology is such a new area in the multilingual European community. Another example is the need for speech
browsing, that is, searching in the vast amounts of spoken documents in multimedia environments.
- Education and training form an integral part of the activities. CTT
is engaged both in basic teaching on the MSc and graduate program and specialised courses for persons already in
the field. Both activities have high priority among our industrial partners, anticipating a great expansion of
the technology area.
Research at CTT
The activity at CTT is performed along several parallel research strands.
The most important is the pre-competitive long-term research. The research at CTT initially includes the following
- Speech technology in interactive dialogue systems.
- Language models for spoken language, including dialogue management.
create speech technology-motivated language and dialogue models for Swedish.
- Methods for automatic speech recognition.
develop state-of-the-art automatic speech recognition for Swedish.
- Principles of speaker characterisation.
create models of speakers for use in systems for speaker verification, speech recognition with rapid speaker adaptation
and individualised speech synthesis.
- Speech production models for multi-modal speech synthesis.
Goal: To develop
articulatorily motivated, highly natural multi-modal parametric synthesis for different voices and speaking styles.
Board of CTT
- Bertil Lyberg, Telia Research AB
- Hans Hermansson, Ericsson Radio Systems AB
- Francisco Lacerda, Stockholm University
- Margita Lundman, Hjälpmedelsinstitutet
- Jonas Ryberg, Levande Böcker i Norden AB
- Per-Olov Lundh, Trio Informationssystem AB
- Yngve Sundblad, CID/Nada, KTH
Co-opted members are:
- Björn Granström, Director of CTT, and
- Rolf Carlson, Co-director of CTT.
The funding agency NUTEK has one observer on the board:
The International Scientific Advisory Board of CTT has three members:
- Joseph Mariani (LIMSI, France)
- Yoshinori Sagisaka (ATR, Japan), and
- Victor Zue (MIT, USA).