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- José A. VALLEJO, Yurii VOROBIEV
- 2014

We describe an averaging procedure on a Dirac manifold, with respect to a class of compatible actions of a compact Lie group. Some averaging theorems on the existence of invariant realizations of Poisson structures around (singular) symplectic leaves are derived. We show that the construction of coupling Dirac structures (invariant with respect to locally… (More)

Accurate prediction of segmental duration from text in a text-to-speech system is difficult for several reasons. One specially relevant is the great quantity of contextual factors that affect timing and how to model them. There are many parameters that affect duration, but not all of them are always relevant. We present a complete environment in which to… (More)

In this paper, we describe the development of a female voice in a Restricted-Domain Speech Synthesis System for Spanish. For the design of the database, we have used a greedy-algorithm approach that focus not only on covering a set of target phonemes, but also on mimicking the histogram of prosodic features from a larger database. For modeling the prosody,… (More)

- Ricardo de Córdoba, Juan Manuel Montero-Martínez, Juana M. Gutiérrez-Arriola, José A. Vallejo, Emilia Enríquez, José Manuel Pardo
- Computer Speech & Language
- 2002

Accurate prediction of segmental duration from text in a text-to-speech system is difficult for several reasons. One which is especially relevant is the great quantity of contextual factors that affect timing and it is difficult to find the right way to model them. There are many parameters that affect duration, but not all of them are always relevant and… (More)

- P. J. Moreno, M. Martinez, José Manuel Pardo, José A. Vallejo
- EUROSPEECH
- 1989

We present a multi-speaker formant synthesizer based on parameter concatenation. The user can choose among three speakers, two males and one female. The synthesizer stores all the parameters for the basic speaker and linear transformation functions to synthesized the other two. The complete database for one speaker consists of 455 parameterized units… (More)

Several methods to improve multiple distant microphone (MDM) speaker diarization based on Time Delay of Arrival (TDOA) features are evaluated in this paper. All of them avoid the use of a single reference channel to calculate the TDOA values and, based on different criteria, select among all possible pairs of microphones a set of pairs that will be used to… (More)

- José A. Vallejo
- 2008

We introduce an n-ary Lie algebroid canonically associated to a Nambu-Poisson manifold. We also prove that every Nambu-Poisson bracket defined on functions is induced by some differential operator on the exterior algebra, and characterize such operators. Some physical examples are presented.

- Juan Monterde, José A. Vallejo, Luis Potosı
- 2012

We show a possible implementation of the RSA algorithm with Maxima CAS. Theoretical background and numerous examples are given, along with the code. We also implement a simplified version of the digital signature method and comment on some ideas for using this material in the classroom.

- Dennise GARCÍA-BELTRÁN, José A. VALLEJO
- 2012

We introduce and study a class of Lie algebroids associated to faithful modules which is motivated by the notion of cotangent Lie algebroids of Poisson manifolds. We also give a classification of transitive Lie algebroids and describe Poisson algebras by using the notions of algebroid and Lie connections.