Conference Paper

Let's go public! taking a spoken dialog system to the real world.

Conference: INTERSPEECH 2005 - Eurospeech, 9th European Conference on Speech Communication and Technology, Lisbon, Portugal, September 4-8, 2005
Source: DBLP


In this paper, we describe how a research spoken dialog system was made available to the general public. The Let's Go Public spoken dialog system provides bus schedule information to the Pittsburgh population during off-peak times. This paper describes the changes necessary to make the system usable for the general public and presents analysis of the calls and strategies we have used to ensure high performance.

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    • "Our experiments are based on the Let's Go corpus (Raux et al., 2005). Let's Go contains recorded interactions between a spoken dialogue system and human users who make enquiries about the bus schedule in Pittsburgh. "
    SIGDIAL; 01/2013
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    • "The context was the Noctívago system, an experimental agenda-based SDS in European Portuguese that provides schedule information about night buses in Lisbon. The first version of the system was adapted from Let's Go [7], a live system that gives bus schedule information for real users in Pittsburgh since 2005. Both telephone systems were based on the Olympus open-source architecture for SDSs [8], and used Ravenclaw [9], an agenda-based dialog manager. "
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    ABSTRACT: This paper proposes an approach to the use of lexical entrainment in Spoken Dialog Systems. This approach aims to increase the dialog success rate by adapting the lexical choices of the system to the user's lexical choices. If the system finds that the users lexical choice degrades the performance, it will try to establish a new conceptual pact, proposing other words that the user may adopt, in order to be more successful in task completion. The approach was implemented and tested in two different systems. Tests showed a relative dialog estimated error rate reduction of 10% and a relative reduction in the average number of turns per session of 6%.
    Acoustics, Speech and Signal Processing (ICASSP), 2013 IEEE International Conference on; 01/2013
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    • "Later studies have focused on real users to study the effect entrainment can have in their utterances. Stoyanchev et al [6] studied lexical and syntactic priming in Let's Go! [7]. Using a small dataset, they stated that both lexical and syntactic choices and concept identification rates are influenced by the system choice of primes. "
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    ABSTRACT: When humans and computers use the same terms (primes, when they entrain to one another), spoken dialogs proceed more smoothly. The goal of this paper is to describe initial steps we have found that will enable us to eventually automatically choose better primes in spoken dialog system prompts. Two different sets of prompts were used to understand what makes one prime more suitable than another. The impact of the primes chosen in speech recognition was evaluated. In addition, results reveal that users did adopt the new vocabulary introduced in the new system prompts. As a result of this, performance of the system improved, providing clues for the trade off needed when choosing between adequate primes in prompts and speech recognition performance.
    Automatic Speech Recognition and Understanding (ASRU), 2011 IEEE Workshop on; 12/2011
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