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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 trends.
  • 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 environment.
  • 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 five areas:

  • Speech technology in interactive dialogue systems.

    Goal: To integrate speech technology in advanced interactive demonstrators.

  • Language models for spoken language, including dialogue management.
    Goal: To create speech technology-motivated language and dialogue models for Swedish.
  • Methods for automatic speech recognition.
    Goal: To develop state-of-the-art automatic speech recognition for Swedish.
  • Principles of speaker characterisation.
    Goal: To 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

    The board of CTT has the following members:

  • 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:

  • Barbro Atlestam

The International Scientific Advisory Board of CTT has three members:

  • Joseph Mariani (LIMSI, France)
  • Yoshinori Sagisaka (ATR, Japan), and
  • Victor Zue (MIT, USA).







Published by: TMH, Speech, Music and Hearing
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Last updated: Monday, 25-Oct-2004 12:06:27 MEST