Sixth European Conference on Speech Communication and Technology
(EUROSPEECH'99)

Budapest, Hungary
September 5-9, 1999

Hands-Free Voice Activation in Noisy Car Environment

J. Iso-Sipilš, K. Laurila, Ramalingam Hariharan, Olli Viikki

Nokia Research Center, Speech and Audio Systems Laboratory, Tampere, Finland

In this paper, we propose an algorithm that enables hands-free and eyes-free voice activated dialing in noisy car environment. Noise robustness is achieved by duration modeling and feature vector normalization techniques. High acceptance of valid command words and high rejection of out-ofvocabulary input is obtained by combination of command word partitioning into proper subword models and a user interface related multi-level approach which utilizes users' custom to repeat unrecognized commands. Experimental simulations show that both in, speaker-independent and speaker-dependent case, we are capable of achieving 99% acceptance of valid command words with less than one false alarm in 25 hours of conversational speech, music and car noise. In addition, real-time car environment tests with novice users show the validity of the simulation results.


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Bibliographic reference.  Iso-Sipilš, J. / Laurila, K. / Hariharan, Ramalingam / Viikki, Olli (1999): "Hands-free voice activation in noisy car environment", In EUROSPEECH'99, 2375-2378.