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About us

Conversational Technologies provides consulting services in the area of speech recognition, natural language processing, and human-computer dialogs.

Deborah Dahl has over 20 years of experience in speech and natural language technologies, including working on research, defense, and commercial systems. She is also active in speech and multimodal standards activities in the World Wide Web Consortium, serving as Chair of the Multimodal Interaction Working Group and Co-Chair of the Hypertext Coordination Group.  She is an editor of the EMMA (Extensible MultiModal Annotation specification) For details, please see her resume.


Natural Language Processing Report

February 26, 2008: A report, "Natural Language Processing Tools" is now available from Conversational Technologies. This report describes the current state of the art in current natural language processing tools and systems. It focuses on commercial applications, but also includes information on research systems. Please contact us for further information.

Recent Publications and Presentations

“Standards for Multimodal Interaction”. In Handbook of Research on Multimodal Human Computer Interaction and Pervasive Services: Evolutionary Techniques for Improving Accessibility. Patrizia Grifoni, ed. IGI Global, to appear in May, 2009. More information.

(with Marcia C. Linebarger, and Rita S. Berndt) “Improving automatic speech recognition of aphasic speech through the use of a processing prosthesis”. Technology and Disability, Vol 20, no. 4, 2008, pp. 283-295.

"Multimodal Demos". SpeechTEK 2008, New York.

"New W3C Standards for Speech and Multimodal Applications" Voice Search Conference, March 10-12, 2008, San Diego.

Standards for Multimodal Applications VoiceXML Review, volume 7, issue 1, April-May, 2007.

10 Innovative Speech Applications Presented at the Spring 2007 SpeechTEK/AVIOS Conference, San Francisco.

Point/Counter Point on Personas Speech Technology Magazine, January-February, 2006, Vol. 11, no. 1, pp. 18-21.

Deborah Dahl, Editor. Practical Spoken Dialog Systems. Springer-Verlag, 2005.

This book is a collection of 10 papers describing the life cycle of spoken dialog systems from requirements definition through deployment, with an emphasis on the practical considerations that are needed to make these applications successful. It also offers a glimpse into the future by including two papers on systems that are still under development in research laboratories. Some of the specific topics treated are error handling, speaker authentication, tool selection, and the psychological bases of human-computer communication.


Professional Memberships

Applied Voice Input/Output Society (AVIOS)
Association for Computational Linguistics
Association for Computing Machinery
Independent Computer Consultants of America
Linguistic Society of America
Midwest Speech Technology Association

Conversational Technologies is a participant in the Midwest Speech Technology Association Member Web Ring

Contact us

Dr. Deborah Dahl
+1 (610) 888-4532
dahl@conversational-technologies.com