In this paper, we present the work done in language identification for two air traffic control speech recognizers, one for continuous speech and the other one for a command interface. The system is able to distinguish between Spanish and English. We will confirm the advantage of using PPRLM over PRLM. All previous studies show that PPRLM is the technique with the best performance despite of its...

This paper proposes a voice activity detector (VAD) based on the complex Laplacian model. With the use of a goodness-of-fit (GOF) test, it is discovered that the Laplacian model is more suitable to describe noisy speech distribution than the conventional Gaussian model. The likelihood ratio (LR) based on the Laplacian model is computed and then applied to the VAD operation. According to the exp...

The Synface project is developing a synthetic talking face to aid the hearing impaired in telephone conversation. This report investigates the gain in intelligibility from the synthetic talking head when controlled by hand-annotated speech. Audio from Swedish, English and Dutch sentences was degraded to simulate the information losses that arise in severe-to-profound hearing impairment. 12 norm...

We consider a distributed power control scheme in a Spread Spectrum (SS) wireless ad hoc network, in which each user announces a price that reflects his current interference level. Given these prices, we present an asynchronous distributed algorithm for updating power levels, and provide conditions under which this algorithm converges to an optimal power allocation. We relate this algorithm to ...

This paper describes some experiments with pronunciation modeling for spontaneous speech in European Portuguese. The transducer framework provides an elegant way to combine a pronunciation lexicon of canonical forms with alternative pronunciation rules. The main phonological aspects that the rules are intended to cover are: vowel devoicing, deletion and coalescence, voicing assimilation, and si...

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This paper studies incentives provision when agents are characterized either by homo moralis preferences, i.e., their utility is represented by a convex combination of selfish preferences and Kantian morality, or by altruism. In a moral hazard in a team setting with two agents whose efforts affect output stochastically, I demonstrate that the power of extrinsic incentives decreases with the deg...

We study how seller exit and continuing sellers’ behavior on eBay are affected by an improvement in market transparency. The improvement was achieved by reducing strategic bias in buyer ratings. It led to a significant increase in buyer satisfaction with seller performance, but not to an increase in seller exit. When sellers had the choice between exiting—a reduction in adverse selection—and im...