TINA: a natural language system for spoken language applications
Computational Linguistics
Usability Engineering
Voice User Interface Design
Software usando reconhecimento e síntese de voz: o estado da arte para o Português brasileiro
CLIHC '05 Proceedings of the 2005 Latin American conference on Human-computer interaction
Evaluation of a multi-user system of voice interaction using grammars
INTERACT'07 Proceedings of the 11th IFIP TC 13 international conference on Human-computer interaction - Volume Part II
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This paper presents the development and empirical evaluation of a voice-based web browser called BrowserVox, capable of dealing with different Brazilian-Portuguese websites. The system uses Automatic Speech Recognition (ASR) and Text-to-Speech (TTS) components, providing opportunity for mouse or voice interaction (multimodal), with audiovisual feedback. With multiuser capability, it works immediately, without requires previous training of the speech recognition component. We get these features through the use of an auxiliary grammar which contains recognition rules dynamically created for each URL accessed. Even with the limited set of recognizable commands, we can create variations of these commands by using additional auxiliary words (eg please), in static and recursive rules included in grammar. This technique allows the commands to become more humanized. It also allows the system to ignore certain words that are uttered spontaneously by users during the dictation of the command, thus improving the efficiency of the speech recognition system. Finally, we applied usability testing, adopting a set of criteria proposed by Nielsen to evaluate the performance of the navigation system.